BLD2022-0760+Manufacturer_Specifications_and_Installation_Instructions+6.10.2022_10.33.55_AM+2924797Havieu
The Leader in Condensing Technology
Installation &Operation Manual
NCB-E Condensing Combi-Boilers
f 51c,� As NSF * Keep this manual near this boiler for future reference whenever
O ME 0 CERTIFIED maintenance or service is required.
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H The wetted surface of this product contacted by consumable water contains less than one quarter of
m L W NOX one percent (0.25%) of lead by weight.
emissions
A WARNING
If the information in these instructions is not followed exactly, a fire or explosion may result, causing
property damage, personal injury or death.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
What to do if you smell gas
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency or the gas supplier.
The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code,
ANSIZ223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Code.
Requirements for the State of Massachusetts
NOTICE BEFORE INSTALLATION
This appliance must be installed by a licensed plumber or gas fitter in accordance with the Massachusetts Plumbing and Fuel Gas Code 248
CMR Sections 4.00 and 5.00.
IMPORTANT: In the State of Massachusetts (248 CMR 4.00 & 5.00)
For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for
residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than
seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall
be satisfied:
1. INSTALLATION OF CARBON MONOXIDE DETECTORS. No installation or replacement of a vented gas appliance shall be permitted unless a
battery powered or electrically hard wired carbon monoxide detector is present on the same floor as the appliance or on the next adjacent
floor when the appliance is located in a crawl space unless the appliance is located in a detached, uninhabitable garage. For all residential
dwellings, a carbon monoxide detector must also be present on each habitable level of the dwelling. These requirements shall not be
deemed to waive any additional requirements imposed by M.G.L. c.148 §26F1/2.
2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance with the above provisions shall
comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.
3. SIGNAGE. Whenever any through -the -wall vent is installed less than seven feet above the finished grade, a metal or plastic identification
plate shall be permanently mounted to the exterior of the building at a minimum height of eight feet above grade directly in line with the
exhaust vent terminal. The sign shall read, in print size no less than 0.5 inches in size, "GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL
OBSTRUCTIONS".
4. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation
unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of
248 CMR 5.09 and 5.12.
Contents
1.
Safety Information
4
8.
Setting the DIP Switches
54
8.1
PCB DIP Switches
54
2.
About the Boiler
7
8.2
Front Panel DIP Switches
55
2.1
Items Included
7
2.2
Accessories
7
9.
Connecting the Power Supply
56
2.3
Specifications
8
2.4
Components
10
10.
Installation Check list
57
2.5
Dimensions
12
2.6
Rating Plate
13
11.
Operating the Boiler for the First Time
60
11.1
Turning the Boiler On or Off
61
3.
Installing the Boiler
14
11.2
Adjusting the Temperature
62
3.1
Choosing an Installation Location
14
11.3
Viewing Basic Information
63
3.2
Mounting the Boiler to the Wall
16
11.4
Setting the Operation Mode
63
11.5
Setting the Parameters
64
4.
Installing the System Piping
18
11.6
Resetting the Boiler
71
4.1
Installing a Space Heating System
18
4.2
Installing a Domestic Hot Water (DHW) System
22
12.
Appendixes
72
4.3
Connecting the Condensate Drain
25
12.1
Gas Conversion
72
4.4
System Fill Connection
28
12.2
Wiring Diagram
78
4.5
Testing the Water System
29
12.3
Ladder Diagram
79
4.6
Examples of System Applications
29
12.4
Component Assembly Diagrams and Parts Lists
80
12.5
Outdoor Temperature Sensor
88
5.
Installing a Cascading System
34
12.6
Outdoor Reset Control (Available with Optional
5.1
Connecting Water Supplies
34
Outdoor Temperature Sensor)
88
5.2
Connecting the Communication Cables
35
5.3
Configuring the Communication Settings
35
6. Connecting the Gas Supply 37
6.1 Gas Pipe Sizing Tables 40
6.2 Measuring the Inlet Gas Pressure 41
7.
Venting the Boiler
43
7.1
Selecting a Vent Type
45
7.2
Selecting Vent Pipe Materials
49
7.3
Measuring Vent Length
50
7.4
Terminating the Vent
51
Contents 3
1. Safety Information
The following safety symbols are used in this manual. Read and
follow all safety instructions in this manual precisely to avoid
unsafe operating conditions, fire, explosion, property damage,
personal injury, or death.
ADANGER
Indicates an imminently hazardous situation which, if not
avoided, could result in severe injury or death.
QWARNING
Indicates a potentially hazardous situation which, if not
avoided, could result in injury or death.
OCAUTION
Indicates a potentially hazardous situation which, if not
avoided, could result in property damage.
ADANGER
If you smell gas:
• Do not try to light any appliance.
• Do not touch any electrical switches or use landline phones.
• From a neighbor's phone, call your gas provider and follow
their instructions.
• If you cannot reach your gas provider, call the fire
department.
• Do not return to your home until authorized by your gas
supplier or the fire department.
Do not use or store flammable products, such as gasoline,
solvents, or adhesives in the same room or area as the
boiler.
• The boiler has a main burner flame that can turn on at
any time and can ignite flammable vapors. Vapors from
flammable liquids can explode and catch fire, causing death
or severe burns.
• Vapors cannot be seen and are heavier than air. They can
travel long distances along the ground and can be carried
from other rooms to the boiler's main burner flame by air
current.
• Keep all flammable products far away from the boiler and
store them in approved containers. Keep the containers
closed tightly and out of the reach of children and pets.
4 Safety Information
QWARNING
• Do not store or use gasoline or other flammable liquids
near this boiler.
Doing so may result in fire or explosion.
• Do not place combustibles, such as newspapers or
laundry, near the boiler or venting system.
Doing so may result in a fire.
• Do not place or use hair sprays, spray paints, or any other
compressed gases near the boiler or venting system,
including the vent termination.
Doing so may result in fire or explosion.
• Do not remove the front cover unless the power to the
boiler is turned off or disconnected.
Failure to do so may result in electric shock.
• Do not operate the boiler with the front cover opened.
Doing so may result in fire or carbon monoxide (CO)
poisoning, which may result in property damage, personal
injury, or death.
• Do not operate this boiler without proper venting.
Doing so may result in fire or carbon monoxide (CO)
poisoning, which may result in property damage, personal
injury, or death.
• Do not touch the power cord or internal components of
the boiler with wet hands.
Doing so may result in electric shock.
California law requires the following Prop 65 warning to be
provided:
QWARNING
This product can expose you to chemicals including lead, lead
compounds, and carbon bisulfide which are known to the
State of California to cause cancer and birth defects or other
reproductive harm. For more information, go to
www.P65Warnings.ca.gov.
OCAUTION
• Do not turn on the boiler unless the water and gas
supplies are fully opened.
Doing so may damage the boiler.
• Do not turn on the water if the cold water supply shut-
off valve is closed.
Doing so may damage the boiler.
• Do not use this boiler for anything other than its
intended purpose, as described in this manual.
• When servicing the controls, label all wires prior to
disconnecting them.
Failure to do so may result in wiring errors, which can lead to
improper or dangerous operation. Verify proper operation
after servicing.
• Do not use unapproved replacement or accessory parts.
Doing so may result in improper or dangerous operation
and will void the manufacturer's warranty.
• Do not place anything in or around the vent terminals,
such as a clothes line, that could obstruct the air flow in
or out of the boiler.
• This boiler has been approved for use in the USA and
Canada only.
Using the boiler in any other country will void the
manufacturer's warranty.
Safety Information 5
ADANGER
To prevent burns:
• Use the lowest operating temperature setting necessary to
provide comfortably -hot water.
• If your household has children or elderly or disabled
residents, consider using a lower temperature setting.
• Do not leave children, the elderly, or disabled persons
unsupervised.
• Do not allow small children to play unsupervised in the
bathroom.
• Do not allow anyone to change the water temperature while
hot water is running.
• Read all the instructions in this manual carefully before
changing the temperature setting.
• Feel the water before using it on children, the elderly, or the
disabled.
• If it is necessary to set the water temperature above 125°F
(52°C), consider installing a thermostatically -controlled
mixing valve or temperature -limiting valve. Contact a
licensed plumber or your local plumbing authority for more
information.
ADANGER
This boiler's DHW temperature is set to 120°F (49°C) at the
factoryfor your safety and comfort. Increasing the temperature
increases the risk of accidental scalding. Water temperatures at
or above 125°F (52°C) can cause instant scalding, severe burns,
or death. Before you decide to change the temperature setting,
read the following charts carefully.
Water
Temperature
160°F (70°C)
Time in which a young child can suffer a
full thickness (3rd degree) burn
Less than 1 second
140°F (60°C)
1 second
130°F (55°C)
10 seconds
120°F (49°C)
10 minutes
100°F (37°C)
very low scald risk
6 Safety Information
2. About the Boiler
2.1 Items Included
When you open the box, you will find the following items with the boiler. Check the box for each of the following items before installing the
boiler.
Installation & Operation Manual,
User's Information Manual Quick Installation Manual Wall Mounting Bracket Tapping Screws &Anchors
e®fie®
g9D
Conversion Kit 2 in Vent Termination Caps 2 in Wall Flanges Pressure Relief Valve, Heating
�1-311
Flow Restrictors Spare Parts Outdoor Temperature Sensorwith Cable
2.2 Accessories
The following optional accessories are available for the boiler:
Navien Manifold Plumb Easy Valve Set Condensate Navi-Link
System (Pressure Relief Neutralizer (Wi-Fi Control Ready -Link Rack NaviClean
Valve, DHW) System)
About the Boiler 7
2.3 Specifications
The following tables list the specifications for the boiler. Additional specifications about water, gas, electric, and air supplies (venting) appear in
the Installation section.
Space Heating Specifications
Navien Combination Boiler r X9.12.1 CEIRTIFIED
I
Other Specifications
Space Heating Ratings
Heating Input, MBH
Heating Capacity2,
Net AHRI Rating Water',
Water
Water Connection
Model Number
MBH
MBH
o
AFUE 2,/o
Pressure
size (Supply, Return)
Min
Max
NCB-150E
12
60
56
49
95
NCB-180E
14
80
75
65
95
12-30 psi
1 in NPT
NCB-210E
18
100
94
82
95
NCB-240E
18
120
112
97
95
1. Ratings are the same for natural gas models converted to propane use.
2. Based on U.S. Department of Energy (DOE) test procedures.
The net AHRI water ratings shown are based on a piping and pickup allowance of 1.15. Consult Navien before selecting a boiler
for installations having unusual piping and pickup requirements, such as intermittent system operation, extensive piping
system, etc.
Domestic Hot Water Specifications
NE
Item
-
NCB-150E
NCB-180E
NCB-210E
NCB-240E
Min
12,000 BTU/H
14,000 BTU/H
18,000 BTU/H
18,000 BTU/H
Input Ratings
Max
120,000 BTU/H
150,000 BTU/H
180,000 BTU/H
199,900 BTU/H
Water Pressure
15-150 psi
0.5 GPM (1.9 L/m)
Minimum Flow Rate
Flow Rate 777 (43°C) Temp. Rise
2.6 GPM
3.4 GPM
4.0 GPM
4.5 GPM
DHW Supply Connection Size
3/4 in NPT
Cold Water Input Connection Size
3/4 in NPT
8 About the Boiler
General Specifications
Item
NCB-150E
NCB-180E
NCB-210E
NCB-240E
Dimensions
17 in (W) x 28 in (H) x 12 in (D)
Weight
66 Ibs (30 kg)
74 Ibs (34 kg)
84 Ibs (38 kg)
84 Ibs (38 kg)
Installation Type
Indoor Wall -Hung
Venting Type
Forced Draft Direct Vent
Ignition
Electronic Ignition
Natural Gas Supply Pressure (from source)
3.5 in-10.5 in WC
Propane Gas Supply Pressure (from source)
8.0 in-13.5 in WC
Natural Gas Manifold Pressure (min/max)
0.09 in WC /
-0.07 in WC /
-0.05 in WC /
-0.06 in WC /
-0.34 in WC
-0.66 in WC
-0.36 in WC
-1.20 in WC
Propane Gas Manifold Pressure (min/max)
-0.04 in WC / -0.07 in WC /
-0.10 in WC /
-0.03 in WC /
0.30 in WC -0.66 in WC
-0.66 in WC
-0.98 in WC
Gas Connection Size
1/4 in NPT
Main Supply
120V AC, 60Hz
Power Supply
Maximum Power
Consumption
200W (max 2A)
Casing
Cold -rolled carbon steel
Materials
Primary Heat Exchanger: Stainless Steel
Heat Exchangers
Secondary Heat Exchanger: Stainless Steel
Domestic Water Heat Exchanger: Stainless Steel
Exhaust
2 in or 3 in PVC, CPVC, Approved Polypropylene, or Stainless Steel
2 in or 3 in Special Gas Vent Type BH (Class III, A/B/C)
Venting
Intake
2 in or 3 in PVC, CPVC, Polypropylene, or Stainless Steel
2 in or 3 in Special Gas Vent Type BH (Class III, A/B/C)
Vent Clearances
0 in to combustibles
Flame Rod, APS, Gas Valve Operation Detector, Ignition Operation Detector, Water
Safety Devices
Temperature High Limit Switch,
Exhaust Temperature High Limit Sensor
This unit may be installed at elevations up to 10,100 ft (3,078 m) for use with Natural Gas, and up to 4,500 ft (1,370 m) for use with
Propane.
Temperature Setting Range
Item Temperature Setting Range
Remarks
DHW 89°F-140°F(30°C-60°C)
Space Heating
Supply 120°F-180°F (48.5°C-82°C)
Finned Tube Baseboard (Default)
Return 101°F-147°F(38°C-63.5°C)
For more information about space heating temperature setting range, refer to"Types of Heat Load"on page 65.
About the Boiler 9
2.4 Components
The following diagram shows the key components of the boiler. Component assembly diagrams and particular parts lists are included in the
Appendixes.
Intake Air
Air Filter
Mixing Chamber
Front Panel
PCB
Exhaust
Flue Duct
Ignitor & Flame Rod
Condensate Trap
Auto Feeder
(Make-up water)
Power Switch
10 About the Boiler
Pressure Relief Valve Adapter
Fan & Motor
Dual Venturi
High Limit Switch
Air Pipe
Gas Pipe
APS
Air Vent
Circulation Pump
3-Way Valve
Space Heating
Supply
Space Heating
Return
Ignition Transformer
Premix Burner
Primary Heat Exchanger
Secondary Heat Exchanger
Pressure Sensor (LWCO)
Gas Valve
Flow Sensor
DHW Inlet Filter
(with built-in flow restrictor)
DHW Inlet
DHW Outlet
About the Boiler 11
2.5 Dimensions
The following diagrams show the dimensions of the boiler and the table lists the supply connections.
E
n
a
Overhead View
Supply Connections
Description
Diameter
A
Pressure Relief Valve Adapter
1/4 in
B
Air Intake
2 in
C
Exhaust Gas Vent
2 in
D
Space Heating Supply
1 in
E
Space Heating Return
1 in
F
Hot Water Outlet (DHW)
1/4 in
G
Gas Supply Inlet
1/4 in
H
Cold Water Inlet (DHW)
1/4 in
I
Condensate Outlet
1/2 in
Auto Feeder Inlet (Make-up
Water)
1/2 in
Supply Connections
2' 3.5" 4.8" 3" 1.8"
) mm (88 mm) (123 mm) (76 mm) (46 mrr
17.3" (440 mm)
12 About the Boiler
2.6 Rating Plate
The Navien NCB-E boilers come from the factory configured for use with Natural Gas (NG). Before starting the installation, check the rating
plate located on the side of the boiler to ensure that the boiler matches the gas type, gas pressure, water pressure, and electrical supply
available in the installation location. If the boiler does not match each of these ratings, do not install the boiler. If conversion to Propane
Gas is required, the included gas conversion kit must be used. Refer to "12.1 Gas Conversion"for details.
Rating Plate, *Plaque Signal6tique
Combination Boller *Chaudiere combinaison
Navien, Inc.
20 Goodyear, Irvine, CA 92618
Tel: 1-800-519-8794
Y
Direct vent indoor installation, * Evacuation directs
installation interieure
Model No., *Numero de models
Type of Gas, *Type de gaz
'
NCB-240E
NG
Max. Input Rating (DHW), *Entree GPL max.
Min. Input Rating, *Debit calorifique max.
A
199,900 Btu/h
18,000 Btu/h
L .W NOX
Max. Input Rating (Heating), *Entree GPL max.
Heating Capacity, *Capacite de chau(fage
emissiorls
120,000 Btu/h
112,000 Btu/h
,f
Category of boiler, *Catsgode de chaudiere
Net AHRI Rating, *Regime de AHRI
Category IV
97,000 Btu/h
Max. Inlet Gas Pressure, *Pression max. de gaz d'entrse 10.5 Inches W.C. pouces W.C.
Min. Inlet Gas Pressure, *Pression min. de gaz d'entrse 3.5 Inches W.C. pouces W.C.
Manifold Pressure, *Pression d'admission -1.20 Inches W.C. pouces W.C.
Electrical Rating, *Regime nominal electrique AC *c.a. 120 Volts 60Hz Use less than 2 Amp, *Utilise moms de 2A
Minimum relief valve capacity, *Capacite minimaum soupape. 189 Ibs/hr ANSI Z21.13-2017 • CSA 4.9.2017
Orifices necessary for LP conversion are provided. *Les injectures nscessaires a Is conversion au GPL sont foumis.
Failure to use the correct gas can cause problems which can result in death, serious injury or property damage. *Le fait de ne pas
utiliser is bon gaz peut causer des problemes qui peuvent mener a Is moM causer des blessures graves ou endommager Is propdete.
Consult your installation manual for more information. *Consuttez votre manual d'installation pour plus d'information.
This appliance is certified for use at altitudes up to 4,500 ft (1,370 m) in accordance to the latest CANICGA 2.17-High Altitude
Installation procedures at normal manifold pressure. For installation instructions at altitudes higher than 4,500 ft, please contact
Navien. *Cet appareil est certifie pour une utilisation a des altitudes de 0 14,500 pieds (1,370 m) conformement aux toutes /es procedures
d'instal/ation a haute altitude CAWCGA 2.17 a une pression normale. Pour lea installations a elevations an haut de 4,500 pieds, appeler le
bureau de Navien.
This appliance must be installed in accordance with local codes or in the absence of local codes, the most recent edition of
National Fuel Gas Code, ANSI Z223. 1, in Canada use CANICGA B149. 1 or 2 installation codes for Gas Burning Appliances.
*Cet appareil doit titre installs conformement aux codes locaux, ou sit n y a pas de codes locaux, Is plus recente version du National Fuel
Gas Code des E.-U., ANSI Z223. 1, au Canada utilisez lea codes d'installation CAN/CGA B149. 1 ou 2 pour lea appareils a gaz.
FOR YOUR SAFETY *POUR VOTRE StCURITE
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other gas appliances. We rangez
pas at n'utilisez pas d'essence ou d'autres liquides ou vapeurs inflammables pres de cat appareil ou de tout autre appareil electromenager.
Q WARNING
Ensure that the gas type and power source specifications match what is listed on the rating plate. Using a different gas type will cause
abnormal combustion and boiler malfunction. Using abnormally high or low AC voltage may cause abnormal operation, and may reduce
the life expectancy of the product.
This appliance complies with the requirements of SCAQMD Rule 1146.2 for NOx emissions of 14 ng/J or 20 ppm at 3%02.
About the Boiler 13
3. Installing the Boiler
3.1 Choosing an Installation Location
When choosing an installation location, you must ensure that the
location provides adequate clearance for the boiler, adequate
venting and drainage options, and sufficient access to gas, water,
and electrical supplies. Carefully consider the following factors
when choosing an installation location:
Q WARNING
Do not install outdoors. Outdoor installation may result in
property damage, severe personal injury, or death. Damage to
the boiler resulting from installation outdoors is not covered
by warranty.
OCAUTION
Review all of the installation information in this manual before
starting installation. Consider all the requirements for venting,
piping, condensate removal, and wiring.
Compliance Requirements
• Local, state, provincial, and national codes, laws, regulations, and
ordinances.
• National Fuel Gas Code, ANSI Z223.1-latest edition.
• Standard for Controls and Safety Devices for Automatically Fired
Boilers, ANSI/ASME CSD-1, when required.
• National Electrical Code.
• For Canada only: B149.1 Installation Code, CSA C22.1 Canadian
Electrical Code Part 1 and any local codes.
Access to Utilities
• Water - the installation location should be near where the
domestic water supply enters the building.
• Gas - the installation location should be near where the gas
supply enters the building.
• Electricity - the installation location should be near where the
electrical supply enters the building.
Humidity and Contact with Water
When installing the boiler, avoid places with excessive humidity.
The boiler has electric gas ignition components. Water spray or
droppings can get inside the boiler and damage the ignition
system.The boiler must be installed in a way to ensure that the gas
ignition system components are protected from water (dripping,
spraying, rain, etc.) during operation and service.
Adequate Drainage
The boiler produces a significant amount of condensate during
operation. The boiler should be located near a suitable drain and
where damage from a possible leak will be minimal. Installing
the boiler in a location without a drain will void the warranty and
Navien will not be responsible for water damages that occur as a
result. For more information about condensate drainage, refer to
"4.3 Connecting the Condensate Drain" on page 25.
The boiler must be located in an area where leakage of the unit or
connections will not result in damage to the area adjacent to the
appliance or to lower floors of the structure. When such locations
cannot be found, installation of an adequately drained drain pan
under the boiler is highly recommended. When installing the drain
pan, ensure that the installation does not restrict combustion air
flow.
14 Installing the Boiler
Adequate Venting and Ventilation
Select a location that requires minimal venting. Consider venting
restrictions caused by windows, doors, air intakes, gas meters,
foliage, and other buildings. For more information about venting,
refer to "7. Venting the Boiler" on page 43.
To ensure adequate venting and ventilation, follow these
guidelines:
• Maintain proper clearances from any openings in the building.
• Install the boiler with a minimum clearance of 12 in (300 mm)
above an exterior grade or as required by local codes.
• Maintain a minimum clearance of 4 ft (1.2 m) from heating and
cooling vents.
• Do not enclose the vent termination.
• Install the exhaust vent in an area that is free from any
obstructions, where the exhaust will not accumulate.
• Do not install the boiler where moisture from the exhaust may
discolor or damage walls.
• Do not install the boiler in bathrooms, bedrooms, or any other
occupied rooms that are normally kept closed or not adequately
ventilated.
Proximity to Fixtures and Appliances
Install the boiler near fixtures that deliver or use hot water, such
as bathroom, kitchen, and laundry room faucets. Select a location
that minimizes the water piping required between major fixtures.
If the distances are long or if the user requires "instant' hot water,
installation of a recirculation line which circulates domestic hot
water back to the boiler from the furthest fixture is recommended.
Insulate as much of the hot water supply and recirculation lines as
possible. For more information about the water supply, refer to "3.2
Installing a Domestic Hot Water (DHW) System"on page 20.
Adequate installation clearances
OCAUTION
Do not install the boiler on carpeting.
Install the boiler in an area that allows for service and maintenance
access to utility connections, piping, filters, and traps. Based on
the installation location, ensure that the following clearances are
maintained:
Clearance from:
Indoor Installation
Top
9 in (229 mm) minimum
Back
0.5 in (13 mm) minimum
Front
Sides
4 in (100 mm) minimum
3 in (76 mm) minimum
Bottom
12 in (300 mm) minimum
Installing the Boiler 15
Debris and Chemical -Free Combustion Air
• Do not install the boiler in areas where dust and debris may
accumulate or where hair sprays, spray detergents, chlorine, or
similar chemicals are used.
• Do not install the boiler in areas where gasoline or other
flammables are used or stored.
• Ensure that combustible materials are stored away from the
boiler and that hanging laundry or similar items do not obstruct
access to the boiler or its venting.
The combustion air must be free of flammable vapors
or corrosive chemical fumes. Common corrosive
chemical fumes to avoid include fluorocarbons
and other halogenated compounds such as Freon,
trichloroethylene, perch loroethylene, chlorine, all
of which can be found in refrigerants or solvents.
When these chemicals burn, they produce acids that
corrode the stainless steel heat exchanger, gaskets,
and the flue and vent system.
Operating Temperature
The ambient temperature at the installation location must be
above freezing temperature and below 100°F (38°C).
3.2 Mounting the Boiler to the Wall
Navien NCB-E boilers come with an upper mounting bracket that
is pre -drilled at 16 in (400 mm) on center for easy installation on
standard wall studs. If the strength of the wall is insufficient or if
the framing is non-standard or uneven, reinforce the area before
installing the boiler. Avoid installation on common walls as the unit
will make some operational noises while it is running.
QWARNING
• The boiler is heavy. Always lift the unit with assistance. Be
careful not to drop the boiler while lifting or handling it to
avoid bodily injury or damage to the unit.
• Do not rest the boiler on the bottom end after removing it
from the shipping carton. Doing so may result in excessive
pressure on protruding pipes and cause product damage.
If you must put the boiler down, lay it on its back or put it
inside the protective shipping base.
• Install the boiler in the upright, vertical position. Installation
in any other orientation will result in improper boiler
operation and property damage, and could result in serious
personal injury or death.
OCAUTION
• Ensure that the structure of the installation location is sturdy
enough to support the full weight of the installed boiler,
including the water contained in the heat exchanger and
related piping.
• The wall must be vertical, and it must be capable of carrying
the weight of the boiler.
• Do not mount the boiler to dry wall that has not been
reinforced.
16 Installing the Boiler
To mount the boiler to the wall:
1. Affix the bracket securely to the wall and ensure that it is level
and that it can support the weight of the boiler.
2. Align the grooves on the back of the boiler with the tongues
on the mounting bracket and hang the boiler on the bracket.
When mounted with the mounting bracket, the boiler will
have a 1/8 in (16 mm) clearance from the back of the wall.
1
i
Installing the Boiler 17
4. Installing the System Piping
Prior to connecting piping to the boiler, flush the entire system
to ensure it is free of sediment, flux, solder, scale, debris or other
impurities that may be harmful to the system and boiler. During
the assembly of the heating system, it is important to keep the
inside of the piping free of any debris including construction and
copper dust, sand and dirt.
For retrofits, all system piping including radiators, must be cleaned
of all build-up including sludge and scale. All systems, old and new,
must be cleaned to remove flux, grease and carbon residue. Navien
recommends cleaning the boiler system with cleaning products
specially formulated for boiler systems. For retrofit applications
with heavy limescale and sludge deposits, a heavier duty cleaner
may be required. For information on performing the cleaning,
follow the instructions included with the boiler system cleaner
products.
Q WARNING
Failure to rid the heating system of the contaminants listed
above will void your warranty and may result in premature
heat exchanger failure and property damage.
4.1 Installing a Space Heating System
The primary and secondary heat exchangers of the Navien NCB-E
boiler are designed to attain the highest level of heat transfer in
a compact design. To accomplish this, the heating water flows
through a series of tubes (secondary heat exchanger) and finned
tubes (primary heat exchanger), designed to maximize the heat
transfer area. To maintain the efficient and reliable operation of the
heat exchangers, and to avoid heat exchanger failure, it is critical to
ensure the rules and guidelines in this section are followed.
Q WARNING
• To avoid damaging the connectors on the boiler, use two
wrenches when tightening pipings to the boiler. Use one
wrench to prevent the connector at the boiler from turning,
and use the other wrench to tighten the connection.
Damaged connectors may result in system leaks.
• Properly support the pipings with hangers. Do not allow the
pipings to be supported by the boiler or its accessories.
OCAUTION
Failure to follow the instructions provided in this section will
void the warranty and may result in property damage, fire,
serious injury or death.
4.1.1 Guidelines for a Space Heating Installation
Read and follow the guidelines listed below to ensure safe and
proper installation of a boiler heating system.
Freeze Protection for a Space Heating System
• Freeze protection products may be used for the space heating
system. Freeze protection for new or existing systems requires
specially formulated glycol , which contains inhibitors to prevent
the glycol from attacking the metallic system components.
• Before using freeze protection products, ensure that system
fluid contains proper glycol concentration and the inhibitor level
is appropriate. Navien recommends against exceeding a 35%
concentration of glycol.
• When using the freeze protection products, the system must
be tested at least once a year, and as recommended by the
manufacturer of the glycol solution.
• When using the freeze protection products, allowance should be
made for expansion of the glycol solution.
• Freeze damage is not covered by the warranty.
Q WARNING
For systems requiring freeze protection, use only inhibited
propylene glycol, specially formulated for hydronic heating
systems; use of other types of antifreeze may be harmful to the
system and will void the warranty.
System Pressure
• The Navien NCB-E boiler is intended solely for use in pressurized
closed loop heating systems operating with 12-30 psi water
pressure at the boiler outlet. To obtain the minimum system
design pressure, follow the piping diagrams illustrated in this
section.
• The Navien NCB-E boiler's space heating system is not approved
for operation in an "open system", thus it cannot be used for
direct potable water heating or to process heating of any kind.
18 Installing the System Piping
Oxygen Elimination
This boiler may only be installed in a pressurized closed -loop
heating system, free of air (oxygen) and other impurities. To avoid
the presence of oxygen, ensure all of the air is removed from
the system during commissioning via strategically placed and
adequately sized air removal devices, located throughout the
heating system.
• The Navien NCB-E boiler has a built-in air vent on top
of the internal circulator to efficiently remove the air
from the boiler.
• See the examples of system application at the end of
this section detailing the installation location of the
air removal device, in case an additional air removal
device is required for a specific application.
Q WARNING
• Immediately repair any leaks in the system plumbing to
avoid the addition of make-up water; make-up water
provides a source of oxygen and minerals that may lead to
heat exchanger failure.
• Failure to follow these instructions will result in poor
performance, unnecessary wear of system components and
premature failure.
4.1.2 Essential Elements in a Space Heating System
Low Water Cut Off (LWCO) Device
Internal LWCO
The Navien NCB-E boiler is equipped with a factory -installed,
pressure -sensing type low water cutoff (LWCO) device. The
minimum operation pressure for this device is 7.3 psig.
• The boiler performs water replenishment
automatically when the built-in water pressure sensor
detects insufficient water level in the boiler system.
• If the water replenishment is not completed after
5 minutes, error code E351 is displayed on the front
panel requiring a manual boiler reset.
Refer to local codes to determine if a LWCO device is required
for your system and ensure that the built-in device meets the
requirements. Install a backflow preventer in the make-up water
line to the unit if required by local codes.
External LWCO
Install a separate LWCO device if required by local codes. The
following figure illustrates an example of typical LWCO installation.
E
E
The external LWCO must be installed at least 6 in 0 50 mm) above
the top of the heat exchanger. Refer to the following diagram for
typical wiring connections of the LWCO to the boiler PCB.
The LWCO device may require annual inspection and
maintenance. Refer to the instructions that are provided
with the LWCO device for complete procedures.
Q WARNING
Ensure the power is turned off while making wiring
connections. Boiler components or the boiler may fail and
result in serious injury, or death if power is supplied during wire
connection. Product failures caused by incorrect installation
are not covered by warranty.
Installing the System Piping 19
0
• • O
CN)3 CN70 CN24 CN25 604WO46
10.00.00
• Remove the factory installed jumper on the LWCO
terminals (CN24) prior to connecting the LWCO.
• The boiler supplies 24 VAC at the LWCO power
terminals (CN25).
Backflow Preventer
Install a backflow preventer valve in the make-up water supply
to the unit as required by local codes. Installation of a backflow
preventer or an actual disconnection from city water supply may
be required.
Expansion Tank
An expansion tank must be installed in the space heating piping
to prevent excessive pressure from building in the system. See the
examples of system application at the end of this section for the
installation location. Refer to the expansion tank manufacturer's
instructions for additional details.
Follow the guidelines below when installing an expansion tank.
• Connect an air separator to the expansion tank only if the air
separator is located on the suction side of the system circulator.
• Navien NCB-E boiler is equipped with an auto -feeding water
connection and motorized feeding valve. Therefore, installation
of additional system water fill connection is not necessary in
most cases.
• If an additional water fill connection is required for a specific
use, install the water fill connection at the same location as the
expansion tank's connection to the system.
• When replacing an expansion tank, consult the expansion tank
manufacturer's literature for proper sizing.
• For diaphragm expansion tanks, always install an automatic air
vent on the top side of the air separator to remove residual air
from the system.
Isolation Valves and Unions
• Full port ball valves are required for the boiler system. Failure
to use full port ball valves could result in a restricted flow rate
through the boiler.
• Check valves are recommended for installation. Failure to install
check valves could result in a reverse flow condition during
pump(s) off cycle.
• Unions are recommended for unit serviceability.
Pressure Relief Valve
To complete the space heating system installation, you must install
a 1/4 in, maximum 30 psi pressure relief valve to the pressure relief
valve adapter located on the top side of the NCB-E boiler. An ASME
approved HV pressure relief valve for space heating system is
supplied with the boiler.
Q WARNING
• Installing the pressure relief valve improperly may result
in property damage, personal injury, or death. Follow all
instructions and guidelines when installing the pressure
relief valve. The valve should be installed only by a licensed
professional.
• The pressure relief valve must be installed vertically to the
pressure relief valve adapter on the top side of the boiler,
as shown in the example below, with the drain pipe outlet
exiting the side of the pressure relief valve horizontally and
elbowing down.
OCAUTION
Install the pressure relief valve as close to the boiler as possible.
No other valve should be installed between the pressure relief
valve and boiler.
Refer to the following illustration and install a pressure relief valve
to the pressure relief valve adapter located on the top corner of the
NCB-E boiler. Conbraco Watts M330-Ml pressure relief valve (1/4 in,
HV, Max 30 psi) is provided with the boiler.
Pressure
Relief Valve
20 Installing the System Piping
Q WARNING
To avoid water damage or scalding, direct the discharge line to
a safe place for disposal.
When installing the pressure relief valve, follow these guidelines:
• Ensure that the valve's discharge capacity is equal to or greater
than the maximum pressure rating of the boiler's space heating
system.
• Ensure that the maximum BTU/H rating on the pressure relief
valve is equal to or greater than the maximum input BTU/H
rating of the boiler.
• Direct the discharge piping of the pressure relief valve so
that hot water does not splash on operator, or any nearby
equipment.
• Attach the discharge line to the pressure relief valve and run the
end of the line to within 6-12 in (150-300 mm) of the floor drain,
making the discharge clearly visible.
• Do not direct the discharge line to a location where freezing
could occur.
• Ensure that the discharge line is not plugged or obstructed.
• After filling and pressurizing the system, test the relief valve
operation by lifting the lever. If the valve fails to operate
correctly, immediately replace the relief valve.
• Ensure that the discharge line allows for free and complete
drainage without restriction. Do not install a reducing coupling
or other restrictions on the discharge line.
OCAUTION
• To avoid potential property damage or personal injury,
check the pressure relief valve at least once every three years
by manually operating the valve to ensure proper operation.
• Before manually operating the valve, check the discharge
line and make sure that the hot discharge water will not
cause personal injury or property damage. Contact with the
discharged water may result in severe personal injury.
If the relief valve discharges periodically, this may be due to
thermal expansion caused by expansion tank waterlogging or
undersizing. Do not plug the relief valve.
4.1.3 Space Heating System Piping
When connecting the space heating system, follow these
guidelines:
• Tighten the connection valves with care to avoid damage.
• After installing the boiler, clean the strainer for space heating
return. Then, test the boiler for proper space heating flow and
inspect for leaks. Instruct the boiler owner that the strainer must
be cleaned periodically to maintain proper space heating water
flow.
The Navien manifold system (optional) allows for easy separation
of the Boiler -Primary loop from the System -Secondary loop(s).
Refer to the following illustration for a typical water piping
example with a Navien manifold system.
Space Heating
Supply ~
pace Heating
return
Installing the System Piping 21
4.2 Installing a Domestic Hot Water (DHW)
System
The Navien NCB-E boiler provides domestic hot water continuously
when flow is sensed by the flow sensor. This method is the most
efficient means of heating water by allowing the boiler to operate
at a lower return water temperature by minimizing standby losses,
thus increasing combustion efficiency.
4.2.1 Guidelines for a DHW System
With its multi -purpose design, the Navien NCB-E boiler provides
hot water on demand. This means that the boiler produces DHW
only when the user demands it.
The boiler recognizes a DHW demand when the flow sensor
detects a DHW flow of approximately 0.5 GPM or greater. Once
the flow sensor detects the flow, the boiler immediately goes into
DHW mode regardless of the status of the space heating system.
Read and follow the guidelines listed below to ensure safe and
proper installation of a boiler heating system.
Scald Hazard
Hotter water increases the risk of scald injury. There is a hot water
scald potential if the DHW temperature is set too high. Be sure
to follow the adjustment instructions in the boiler's operation
manual.
About the DHW Quality
Proper maintenance of the boiler is required when water quality
does not meet EPA standards. Damage caused by poor water
quality is not covered under warranty. The following table shows
the maximum contaminant levels allowed, based on the EPA
National Secondary Drinking Water Regulations (40 CFR Part
143.3). If you suspect that your water is contaminated in any way,
discontinue use of the DHW and contact an authorized technician
or licensed professional.
Contaminant
Maximum Allowable Level
Total Hardness
Up to 200 mg/I (12 grains/gallon)
Aluminum
0.05 to 0.2 mg/I
Chloride
Up to 250 mg/I
Copper
Up to 1.0 mg/I
Iron
Up to 0.3 mg/I
Manganese
Up to 0.05 mg/I
pH
6.5 to 8.5
Sulfate
Up to 250 mg/I
Total Dissolved Solids (TDS)
Up to 500 mg/I
Zinc
Up to 5 mg/I
Navien is not responsible for plugging of the domestic system by
scaling or accumulation of dirt; suitable steps shall be taken by the
installer and user to avoid water quality related issues.
Freeze Protection
Navien recommends heat tracing and insulating the DHW water
pipes. Pipe enclosures may be packed with insulation for added
freeze protection. Freeze damage is not covered by the warranty.
22 Installing the System Piping
4.2.2 Essential Elements in a DHW System
DHW Heat Exchanger
The DHW heat exchanger installed inside the Navien NCB-E boiler
has been tested and certified in accordance with IAPMO standard
PS 92-2010.
Drain and Isolation Valves
Install drain and isolation valves on the inlet and outlet of the
DHW heat exchanger, so it can be flushed free of possible build-up
caused by dirt or hard water.
DHW Filter
The Navien NCB-E boiler has built-in DHW filter at the entrance of
the cold water inlet. Clean the filter periodically to ensure that the
filter is not obstructed creating disturbance in the flow. Failure to
protect the flow sensor from dirt and debris will cause the boiler to
malfunction.
Flow Restrictor (pressure regulator)
A flow restrictor is used to avoid excessive flow at the faucets. The
Navien NCB-E boiler has a built-in flow restrictor at the cold water
inlet adapter to limit the overall flow of domestic hot water. Follow
the instructions below when installing a flow restrictor:
OCAUTION
Do not operate the boiler without the flow restrictor installed.
Refer to the flow restrictor specifications and install an
appropriate valve for proper operation.
All Navien NCB-E boilers are shipped from the factory with three
flow restrictors included for different flow rates. Each flow restrictor
allows for a specified amount of water to flow through the unit. A
flow restrictor valve is pre -installed at the cold water inlet adapter
(at the tip of the cold water inlet filter).
The flow restrictors are color coded for easier identification. Refer
to the table below for detailed specification. Factory -installed flow
restrictors and specifications are as follows:
Valve color
Applied Model
Specification*
Orange
NCB-240E, pre -installed
5.6 GPM
Yellow
NCB-210E, pre -installed
5.0 GPM
Blue
NCB-180E, pre -installed
4.0 GPM
Pink
NCB-150E, pre -installed
2.6 GPM
* Flow rate in GPM, as factory tested with 56 psi water pressure.
The following graph describes the water flow rate (in GPM) and
water pressure (in psi) specifications for each flow restrictor.
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
00
0 74 28 42 56 71 85 99 113
Orange
Yellow
Blue
Pink
If necessary, replace the factory -installed flow restrictor with one
that satisfies your flow requirements. Follow these instructions to
replace the flow restrictor.
1. Locate the cold water inlet adapter on the bottom of the unit.
Installing the System Piping 23
2. Turn the knob counterclockwise to remove the water inlet
filter. The flow restrictor is attached at the tip of the filter
assembly.
3. Remove the current flow restrictor and replace it with one that
provides an appropriate flow rate.
Pressure Relief Valve for DHW
To complete the installation of the DHW system, you must install
an approved 1/4 in, maximum 150 psi pressure relief valve on
the hot water outlet. The Navien NCB-E boiler has a built-in high
temperature shut off switch, so install a "pressure only" relief valve.
Q WARNING
• Installing the pressure relief valve improperly may result
in property damage, personal injury, or death. Follow all
instructions and guidelines when installing the pressure
relief valve. The valve should be installed only by a licensed
professional.
• The pressure relief valve must be installed at the boiler outlet
and in the vertical position, as shown in the example below,
with the drain pipe outlet exiting the side of the pressure
relief valve horizontally and elbowing down.
The DHW pressure relief valve is not supplied, but is required.
The following examples are pressure relief valves approved for use
with the boiler:
• Wilkins P-1000A (Zurn Industries)
• Conbraco 17-402-04
• Watts Industries 3L (M7)
• Cash Acme FWL-2, 3/4 in
Pressure
Relief Valve
DHW Supply Cold Water Inlet
OCAUTION
Install the pressure relief valve as close to the boiler as possible.
No other valve should be installed between the pressure relief
valve and boiler.
When installing pressure relief valve, follow these guidelines
• Ensure that the valve's discharge capacity is equal to or greater
than the maximum pressure rating of the boilers DHW system.
• Ensure that the maximum BTU/H rating on the pressure relief
valve is equal to or greater than the maximum input BTU/H
rating of the boiler.
• Direct the discharge piping of the pressure relief valve so
that hot water does not splash on operator, or any nearby
equipment.
• Attach the discharge line to the pressure relief valve and run the
end of the line to within 6-12 in (150-300 mm) of the floor.
• Ensure that the discharge line allows for free and complete
drainage without restriction. Do not install a reducing coupling
or other restrictions on the discharge line.
• If the relief valve discharges periodically, this may be due to
thermal expansion in a closed water supply system. Contact the
water supplier or local plumbing inspector on how to correct the
situation. Do not plug the relief valve.
24 Installing the System Piping
4.2.3 DHW System Piping
(D CAUTION
To comply with ASME or CRN requirements, an additional high
temperature limitation device may be needed. Consult your
local code requirements to determine if this device is required.
Refer to the following illustration for a typical DHW piping example
for the boiler.
Cold Water Supply
_)HW Supply
When installing the DHW system, follow these guidelines:
• Use only pipes, fittings, valves, and other components (such as
solder), that are approved for use in potable water systems.
• Tighten the connection valves with care to avoid damage.
• Navien recommends using unions and manual shut-off valves
on the cold water inlet and DHW outlet.
• Keep the hot water piping system as short as possible, to deliver
hot water to the fixtures more quickly.
• To conserve water and energy, insulate the DHW supply and
DHW recirculation lines (if applicable). Do not cover the drains or
pressure relief valves.
• After installing the boiler, clean the cold water inlet filter.
Then, test the boiler for proper DHW supply and inspect for
leaks. Instruct the boiler owner that the filter must be cleaned
periodically to maintain proper DHW flow.
4.3 Connecting the Condensate Drain
The Navien NCB-E boiler creates condensation when it operates.
This condensation has an acidic pH of 3-5. Follow all local codes
and regulations when disposing of condensate from the boiler.
We recommend draining the condensate into a laundry tub,
as the alkali in laundry detergent will neutralize the acid in the
condensate. However, other suitable waste drain locations may be
used according to the local codes.
OCAUTION
• Fill the condensate trap with water after installing the
condensate drain pipe.
• Do not cap or plug the integrated condensate line. If
prevented from draining, condensate can damage the boiler.
• The condensate line must have a negative slope to drain
properly.
• Do not use condensate for drinking or for consumption by
animals.
Before connecting the condensate drain, choose one of the
following disposal options:
1
l
a. From the boiler directly into an external drain
b. From the boiler, through a neutralizing agent, and then
into an external drain
Installing the System Piping 25
If you choose this option, the neutralizing agent
must be replaced periodically. Depletion of
the neutralizing agent will vary, based on the
usage rate of the boiler. During the first year of
operation, the neutralizer should be checked
every few months for depletion and replaced as
needed.
c. From the boiler into a laundry tub.
The bottom of the boiler must be higher than
the top of the laundry tub to use this option. The
condensate line must have a negative slope to
drain properly.
d. From the boiler into a condensate pump, and then into a
laundry tub.
A pump can be used when there is a long
distance between the boiler and the laundry tub
or when the bottom of the boiler is lower than the
top of the laundry tub.
To connect the condensate drain:
1. Connect a drain line to the V2 in fitting at the bottom of the
boiler.
Use only corrosion -resistant material for the drain line, such as
PVC or CPVC. Do not reduce the size of this fitting or the drain
line to less than V2 in.
3. Fill the condensate trap by pouring water into the boiler's
exhaust vent until water flows through the condensate drain.
4
OCAUTION
The condensate line must remain unobstructed, allowing for
the free flow of condensate. If condensate freezes in the line, or
if the line is obstructed in any other manner, condensate can
exit from the tee, resulting in potential water damage.
Maintenance
Periodically monitor the level of media in the neutralizer and test
NPT'/2 in the pH level at the outlet. We recommend an annual pH test using
recognized test strips or an electronic pH meter to obtain precise
measurements. Replace the neutralizing media when the pH drops
below the minimum level required by the local water authority. If
the pH level is not specified, replace the neutralizing media when
the pH is below 6.0. For replacement media, contact your local
Navien distributor.
2. Place the free end of the drain line into an appropriate drain.
• If you are using a condensate pump, ensure that the pump
allows for up to 2 GPH of drainage for each boiler in the system.
• If you are not using a condensate pump, ensure that the drain
line is pitched downward at a minimum slope of /4 in per foot.
As part of this annual maintenance procedure, make sure to clean
out the condensate trap which may contain excess debris. Drain
the condensate within the trap, then replace with fresh water using
the provided access port.
26 Installing the System Piping
4.3.1 Condensate Neutralizer Kit
Q WARNING
• To avoid damaging the appliance, the neutralizer inlet and
discharge must be lower than the condensate drain.
• Do NOT allow exhaust flue gases to vent through the
neutralizer. Leakage can cause injury or death from carbon
monoxide.
• The connection between the appliance and the neutralizer
must be installed to prevent the backflow of condensate
into the appliance.
• Do not connect more than one appliance to the neutralizer.
If option 'b' is selected for condensate disposal, the Navien
condensate neutralizer kit is recommended. The condensate from
the appliance flows through the neutralizing media and increases
the pH of the condensate. An increased pH prevents corrosion of
the installation's drainage system and the public sewer system.
Installation
• The inlet has a center connection port and the outlet has an
offset connection.
• Install the neutralizer on the wall or the floor and secure it using
the brackets supplied with the kit.
• If the neutralizer is installed horizontally, rotate the neutralizer to
position the outlet at the highest point (Figure 1).
• If the neutralizer is mounted vertically, ensure that the outlet is
higher than the inlet (Figure 2).
• Ensure that the condensate runs freely to the drain.
• Ensure all connections are made to prevent the backflow of
condensate. Use corrosion resistant piping and secure all piping
to prevent movement.
Do not install condensate piping in areas where the
temperature drops below freezing point. Protect piping
in high pedestrian areas from damage and vibration.
• For increased safety when the condensate drain blocks, install
a Y-fitting. Connect the Y-fitting as shown in the installation
diagram and ensure that the condensate runs freely to the drain.
• Ensure that the discharge connection is accessible. Access to
the discharge connection is required for maintenance and pH
testing.
• If there is insufficient gradient for drainage, install a drainage
pump designed for boiler and water heater condensate removal.
0
Optional
overflow bypass
-------------------
Figure 1. Horizontal installation
Optional
overflow bvr
44
Figure 2.Vertical installation
Maintenance
Periodically monitor the level of media in the neutralizer and test
the pH level at the outlet. We recommend an annual pH test using
recognized test strips or an electronic pH meter to obtain precise
measurements. Replace the neutralizing media when the pH drops
below the minimum level required by the local water authority. If
the pH level is not specified, replace the neutralizing media when
the pH is below 6.0. For replacement media, contact your local
Navien distributor.
Installing the System Piping 27
4.4 System Fill Connection
Before filling the boiler, open the pressure relief valve by lifting the
lever on top, and loosen the air vent cap to allow the system to fill
properly. Close the pressure relief valve when the system is full.
Air Vent Cap
OCAUTION
Ensure that the pressure relief valve is closed before testing or
operating the system.
4.4.1 Built-in Water Fill Connection
Navien NCB-E boiler is equipped with an auto -feeding water
connection and motorized feeding valve. Therefore, installation
of additional system water fill connection is not necessary in
most cases. See the following figure for an example of a water fill
installation using the built-in connection.
1
Backflow Preventer
Make-up Water
4.4.2 External Water Fill Connection
External water fill connection may be installed on the system
piping if it is required for specific applications. See the following
figure for an example of external water fill installation on the
system piping.
Circula
To System ~
Make-up
Water
From
System
28 Installing the System Piping
4.5 Testing the Water System
Q WARNING
Ensure that the boiler is full of water before firing the burner.
Operating the unit without filling it will damage the boiler.
Such damage is not covered by the warranty, and may result in
property damage, severe personal injury, or death.
Perform a leak test after installing the boiler's water system to
make sure that the system has been installed properly. Follow the
instructions below to perform a fill test on the water system.
1. Fill the system only after ensuring that the water chemistry
meets the requirements listed in this manual.
2. Close the manual and automatic air vents and the boiler drain
valve.
3. Fill the boiler to the correct system pressure. The correct
pressure will vary with each application. The typical cold water
fill pressure for a residential system is 12 psi. The pressure
will rise when the boiler is turned on and the system water
temperature increases. The operating pressure must never
exceed the relief valve pressure setting.
4. At initial fill and during boiler start-up and testing, check
the system thoroughly for leaks. Repair any leaks before
proceeding further.
Q WARNING
Eliminate all system leaks. The continual introduction of fresh
makeup water will reduce boiler life. Minerals can build up in
the heat exchanger, reducing heat transfer, overheating the
heat exchanger and causing heat exchanger failure.
The system may have residual substances that could affect water
chemistry. After the system has been filled and leak tested,
verify that water pH and chlorine concentrations are within the
acceptable range by performing sample testing.
OCAUTION
Before operating the boiler for the first time, ensure that the
boiler system is filled with water. Purge the air inside the
system to avoid damage to the boiler.
4.6 Examples of System Applications
Refer to the following examples to properly implement a system
for space heating, DHW supply, or both. These examples are
provided to suggest basic guidelines when you install the boiler
system. However, the actual installation may vary depending on
the circumstances, local building codes, or state regulations. Check
the local building codes and state regulations thoroughly before
installation, and comply with them fully.
Q WARNING
Ensure the power is turned off while making wiring
connections. Boiler components or the boiler may fail and
result in serious injury or death if power is supplied during wire
connection. Product failures caused by incorrect installation
are not covered by warranty.
4.6.1 Considerations for System Applications
Read and follow the guidelines listed below when installing system
piping for the Navien NCB-E boiler:
• System application drawings are intended to explain the system
piping concept only.
• When installing a mixing valve on the DHW piping, ensure that
the cold water pressure does not exceed the hot water pressure.
• For the upstream side of all circulators, use straight pipes with a
minimum diameter Of'/2 in (12 mm).
• Keep the auto feeder connection cap closed unless the auto
feeder is in use and piping has been connected to the auto
feeder valve.
• Provide a system expansion tank following the guidelines on
page 20.
• Installations must comply with all local codes.
Air Removal
The boiler and system piping layout must be configured to
promote the removal of air from the water. Air vents and bleeders
must be strategically placed throughout the system to aid in
purging the air from the system during commissioning of the
boiler. The system must also employ the use of a strategically
located air removal device, such as an air scoop or micro -bubbler,
designed to remove the air from the water as it flows through the
system.
Follow the installation instructions included with the air removal
device when placing it in the system; air removal devices generally
work better when placed higher in the system. Always locate air
removal devices in areas of the system that have a guaranteed
positive pressure, e.g., in close proximity to the water fill and
expansion tank.
Installing the System Piping 29
The Navien NCB-E boilers have a built-in air vent on
top of the internal circulator to purge air from the
boiler system.
Expansion Tank
The expansion tank must be sized in accordance with the water
volume of the system as well as the firing rate of the appliance. It
is important to locate the expansion tank, and make-up water fill,
on the inlet side of any circulator in the system, as doing so will
guarantee the lowest pressure in the system will be at least equal
to the tank and make-up water pressure.
Ensure the expansion tank cannot become isolated from the
boiler anytime the system is operating. Failure to follow these
instructions may lead to discharge from the pressure relief valve,
which may result in property damage or injury.
The installation of flow checks, motorized valves or
other shutoff devices (other than for the purpose of
servicing) are not permitted between the location of
the"Closely Spaced Tees" and the expansion tank.
Air Handler Interface
The Navien NCB-E boiler can control the operation of an air
handler when a thermostat is used in combination with the air
handling unit. The Air Handler Interface is designed to stop air
handler operation when the boiler's space heating function is not
operating due to DHW supply demands, boiler errors, or low water
conditions.
The air handler contacts (A/H) turn off when the following
conditions arise:
• The PCB DIP SW2 #7 is set to ON.
• Thermostat is turned off.
• The boiler is supplying DHW, or it is in stand-by mode for DHW
demand.
• Level 2 Errors, or higher level errors occur.
• The boiler is turned off.
• Make-up water auto -feeding is in progress.
OCAUTION
• Do not remove the front cover unless the power to the
boiler is turned off or disconnected. Failure to do so may
result in electric shock.
• Configure only the DIP switches that require adjustment
according to the instructions in this manual. Do not adjust
any other DIP switches.
Thermostat Confiquration for the Air Handler Interface
Set the PCB DIP SW2 #7 to down position (OFF) to use a thermostat
with the Air Handler.
Refer to the following diagram for wiring connections.
<Air Handler>
Q WARNING
<NCB-E>
CN23 CN10 CN24 CN25 1d 4600#
000"=�O
• Do not turn the power on until electrical wiring is finished.
Disconnect power before servicing. Death or serious injury
from electrical shock may result if power is supplied to the
boiler during electrical wiring or servicing.
• The boiler, when used in conjunction with a refrigeration
system, must be installed so that the chilled medium is
piped in parallel with the heating boiler. Appropriate valves
must be used to prevent the chilled medium from entering
the boiler.
• If the boiler is connected to heating coils located in air
handling units where they can be exposed to refrigerated
air, use flow control valves or other automatic means to
prevent gravity circulation of the boiler water during the
cooling cycle.
30 Installing the System Piping
4.6.2 System Application -Zone System with Zone Valves
Additional Zone
---------------------------------------
Zone #2 ---------- ------
-----------------
Hi
iiiii
Zone#1 -------------------- -ii - ------------
-----------------------------------------
-----
Zone Valve
Circulator ,T.1--h -1
Expansion Tank
rol
Not to exceed 4 pipe Dia or Max. 12 in
• System application drawings are intended
to explain the system piping concept only.
• Refer to 4.4 System Fill Connection on page
28 for make-up fill connections and refer
to the requirements of your local codes to
ensure compliance.
Wiring Diagram
<NCB-E>
II MOO •
MOO - - -
Installing the System Piping 31
4.6.3 System Application -Zone System with Circulators
Additional Zone
-----------------------------------------
Zone#2------------------------------- ----- -
-----------------------------------------
Zone #1 '-----
----------------------
--------------------7vel
-----
CheckS stem Circula
Q Q Q
T T T
Lo
' \ Not to exceed 4 pipe Dia or Max.12 in
b
• System application drawings are intended
to explain the system piping concept only.
• Refer to 4.4 System Fill Connection on
page 28 for make-up fill connections
and refer to the requirements of your local
codes to ensure compliance.
Wiring Diagram
<NCB-E>
32 Installing the System Piping
4.6.4 System Application -Air Handler System
• System application drawings are intended
to explain the system piping concept only.
• Refer to 4.4 System Fill Connection on page
28 for make-up fill connections and refer
to the requirements of your local codes to
ensure compliance.
• Boiler side piping to the air handler
which exceeds the capabilities of the
internal boiler circulator requires primary/
secondary piping configuration with a
separate system circulator.
• Air handlers with an internal circulator
shall be piped either with a crossover pipe
at the AHU or in a primary/secondary
configuration with the boiler.
Wiring Diagram
I F 0
<Air Handler>
CN23 CN10 CN24 CN25
10Z0411MI]C�Z�]
Installing the System Piping 33
5. Installing a Cascading System
When installing a cascading system, carefully consider the design of the system and the features of the installation location. Follow all local
codes and regulations, as well as all guidelines for installing the combination boiler and water heaters. The following sections describe
additional considerations that are specific to installing cascading systems. Read them carefully before designing or installing the system.
5.1 Connecting Water Supplies
Several options are available for plumbing a cascading system. The setup you choose will vary based on the installation location, local building
codes, and other factors. Follow all applicable regulations when installing a cascading system.
You can install one NCB-E boiler with multiple NPE / NR / NIP series water heaters to configure a cascade system. In the system, the boiler must
be configured as the master unit. You can connect up to 15 water heaters to one NCB-E boiler to meet high -volume hot water demands by
using Navien Ready -Link communication cables and following the set-up procedures in this section; additional controllers are not necessary.
The following is one of the possible connection options:
<NCB-E Series> <NPE Series, NR/NP Series>
'I.IDF Ce.icc SIR/I.ID Ccriuc�
Air Sep
• Install a 120V AC (max 1.5A) normally closed solenoid valve on the NCB-E boiler's hot water supply, and then connect the valve wires to
the external power port(Extern. Power) on the main PCB (refer to the wiring diagram). A slow -closing solenoid is recommended to prevent
water hammer from occurring.
• When linking multiple water heaters to NCB-E series boiler, only the master unit can provide space heating and slave units must be
configured for DHW only (You can set only the NCB-E boiler as the master unit in the cascade system, and the master unit controls the
power on/off status of all the slave units in the system).
• Once turned on by the master unit, the water heaters will operate in stages to satisfy the DHW demands.
• After completing the cascade settings and saving the changes, the boiler and water heater units must be turned off then turned back on for
the changes to take effect.
• If errors occur while operating a cascade system, the relevant errors are displayed in the display of the failing unit (with the exception of NR/
NIP units).
• Power supply to the units must be OFF during the system piping.
• The recommended recirculation flow rate for each water heater is 2-4 GPM. Depending on the number of water heaters and
the diameter of the recirculation line, it may not be necessary to connect all the NPE / NR / NIP "A" series water heaters to the
recirculation line. If this is the case, set any unconnected "A" model water heaters to internal recirculation mode.
• Each unit must be configured for cascade operation.
34 Installing a Cascading System
5.1.1 Piping Sizes and Considerations
When piping a cascading system, consider the following pipe
diameters and flow rates. Note that flow rates above 6.6 ft/s may
cause pipe erosion. These specifications may vary depending on
installation conditions.
Qty
AT=540F
Flow rate
(GPM)
Water
Velocity
(ft/s)
Pipe Diameter (mm/in)
Mill
1
7.19
4.78
20A
1/4 in.
2
14.38
5.61
25A
1 in.
3
21.57
5.54
30A
11/4 in.
4
28.77
5.21
40A
11/2 in.
5
35.96
6.53
40A
11/2 in.
6
43.15
4.49
50A
2 in.
7
50.34
5.24
50A
2 in.
8
57.5
6.00
50A
2 in.
9
64.72
4.39
65A
21/2 in.
10
71.92
4.75
65A
21/2 in.
11
79.11
5.34
65A
21/2 in.
12
86.30
5.84
65A
21/2 in.
13
93.49
6.33
65A
21/2 in.
14
100.68
6.79
65A
21/2 in.
15
107.87
5.11
80A
3 in.
16
115.07
5.44
80A
3 in.
17
122.26
5.81
80A
3 in.
18
129.45
6.14
80A
3 in.
19
136.64
6.46
80A
3 in.
20
143.83
6.83
80A
3 in.
21
151.02
4.06
100A
4 in.
22
158.21
4.25
100A
4 in.
23
165.41
4.45
100A
4 in.
24
172.60
4.65
100A
4 in.
25
179.79
4.85
100A
4 in.
26
186.98
5.05
100A
4 in.
27
194.17
5.24
100A
4 in.
28
201.36
5.44
100A
4 in.
29
208.56
5.61
100A
4 in.
30
215.75
5.81
100A
4 in.
The table above is based on model NCB-240E.
5.2 Connecting the Communication Cables
You can connect one NCB-E boiler with up to 15 Navien water
heaters, using the Ready -Link communication cables. Select the
NCB-E series combination boiler in the cascading system as the
master unit, and then connect the water heaters to it as slaves.
Before making any connections, ensure that the power is turned
off to all the units.
Connect the Ready -Link cables to the J6 port of the master unit
and to the J6 port of the slave water heaters (on the right side of
the front panel):
For NR/NP units, connect the Ready -Link cable to the
CN9 port on the main PCB.
5.3 Configuring the Communication
Settings
After connecting the Ready -Link communication cables, restore
power to the combination boiler and turn on all water heaters
using the Power button.
5.3.1 Cascade Protocol Settings
Cascade protocol may be set for 2 different communication speeds
according to the type of water heater units installed in the system.
Refer to "Setting the Cascade Protocol"on page 70 and match
the communication settings accordingly.
Item
Description
Use this setting when all the slave units are NPE water
NPE
heaters.
Use this setting when the slave units consist of NR/NP
NR/NP
water heaters, or a combination of NPE and NR/NP
water heaters.
Installing a Cascading System 35
5.3.2 Cascade System Settings
To configure the cascade communication settings:
1. On the master NCB-E boiler, press and hold the Diagnostic
and Up(+) buttons for more than 5 seconds."MA.00"will
appear on the display to confirm that this combination boiler
is set as the master.
I NO NO NO -tmAIR AIR
uuuu
Sl Rt O/R GPM psi
2. On the slave water heaters, press and hold the Diagnostic and
Down(-) buttons for more than 2 seconds."SL.01"will appear
on the display to confirm that this water heater is set as a slave.
10 n .I.
a _ o0
idH No NU °I1 °
piN .11q iiI; .I I1
S4 Rt O/R GPM psi
lit
3. Repeat step 2 to configure the rest of the slave units in the
system.
4. On the master NCB-E boiler, press and hold the Diagnostic
and Up(+) buttons for more than 5 seconds. All the display
screens on the configured units will return to the temperature
display.
• To add additional slaves at a later time, repeat
step 2.
• Cascade communication setup must be completed
within 1 hour. Otherwise, all units will return to the
normal operation mode and the cascade mode will
be turned off.
• To cancel the cascading communication setup,
on the master combination boiler, press and
hold the Diagnostic and Reset buttons for more
than 5 seconds. The water heaters will revert
to independent operation. Repeat steps 1-4 to
reassign the master combination boiler.
• To replace the master unit, cancel the current
cascade mode configuration and repeat the
steps 1-4 on the new master unit.
5.3.3 Cascade Set-up Procedure for NP/NR Series
Models
To configure the NR/NP series water heaters for a cascade system,
follow the instructions below:
1. Press the SW3 and SW4 (service switches on the main PCB)
simultaneously for more than 3 seconds on the NP/NR series
water heater. FND1 on the main PCB will display"S001"to
confirm that this water heater is set as the slave unit #1.
OCN 12 00 000 )O
CN7 �on fV.88.8 ))o
o Oip SIM6 0 0 or
000000 00000000
o O
o pipsAl O 02 CN,9
o
o O O
o uia�uax o000 0 0
0
o upawanau cap
o Val,.Adjua n Dip sA5 Q O
o O N18
O
CN13
O
e 0
CN15 CN1]
O 0
CN 14 O
0
o
O CN,O
CN22 SW4 SW3
8
I
0
0 0
0
IN Cfll
2. Repeat step 1 on the other NR/NP series water heaters to add
more NR/NP slave units.
36 Installing a Cascading System
6. Connecting the Gas Supply
Q WARNING
• Before connecting the gas supply, determine the gas type
and pressure forthe boiler by referring to the rating plate. Use
only the same gas type indicated on the rating plate. Using
a different gas type will result in abnormal combustion and
malfunction of the boiler. Gas supplies should be connected
by a licensed professional only.
• To avoid damaging the connectors on the boiler, use two
wrenches when tightening piping to the boiler. Use one
wrench to prevent the boiler's connector from turning, and
use the other wrench to tighten the connection. Damaged
connectors may result in system leaks.
• Properly support the piping with hangers. Do not allow the
piping to be supported by the boiler or its accessories.
• Ensure that the gas piping is protected from physical
damage and freezing where required. Failure to follow
these instructions could result in gas leakage and result in
fire, explosion, property damage, severe personal injury, or
death.
• The appliance and its gas connection must be leak tested
before placing the appliance in operation.
• To avoid danger from explosion and fire, do not use a flame
to check for a gas leak. Perform a bubble test on thejoints to
check for gas leaks. If a leak exists, bubbles will form at the
leaking joint. A gas leak could result in substantial property
damage, severe personal injury, or death.
• Immediately turn off the boiler and stop the gas supply
if a gas leak is detected. Perform a bubble test to find the
leak and repair the leak immediately. Do not start the boiler
again until the leak is repaired. Operating the boiler with a
gas leak could result in substantial property damage, severe
personal injury, or death.
• This boiler cannot be converted from natural gas to propane
or vice versa without a Navien gas conversion kit. Do not
attempt a field conversion ofthis boiler without a Navien gas
conversion kit. Doing so will result in dangerous operating
conditions and will void the warranty.
Navien recommends connecting the boiler as the first device
downstream of the gas meter, to ensure a sufficient gas supply.
Gas meter's capacity >_ Total gas
capacity of connected appliances
Supply Line
The boiler is
recommended to be
the first appliance to
be connected to the
gas supply line.
To connect the gas supply:
1. Determine the gas type and pressure for the boiler by referring
to the rating plate.
2. Perform a pressure test on the main gas supply line.
3. Purge the gas line of any debris.
4. Determine the proper size and type for the gas line. Refer to
the tables that follow.
5. Install certified full port valves on the gas supply line and
boiler.
6. Connect the gas supply line.
7. Test the supply line, all connection points, and the boiler for
gas leaks.
Connecting the Gas Supply 37
• Tighten the boiler connection valves with care to
avoid damage.
• The gas connection fitting on all boilers is 1/4 in
9 • 1/2 in rigid pipe can be used; refer to the sizing
Gas Supply - tables on the proceeding pages for limitations. Do
not use /2 in corrugated connectors or tubing as
noise may occur.
Pipe size: 1/2 in to 3/4 in
(inner diameter)
MEDMMMMEMM
Corrugated Connector
Gas Shutoff
When using flexible gas lines, ensure that the pipe's
LL [�_11
Valve
inner diameter and connector is sufficient to supply
Union
the required BTUs. Also, ensure that the flexible line
has no crimps or tight bends in it, as this will restrict
gas flow.
• When using rigid pipe, Navien recommends the
Gas Inlet Adapter
installation of a union on the gas supply line close
to the boiler, to facilitate any future maintenance
or service.
y
I CAUTION
Prior to using an excess flow valve (EFV) in the gas line, check
the manufacturer's minimum and maximum flow capacity
Bottom view
rating. An improperly sized EFV will not allow for a full flow of
gas to the boiler and may cause improper operation.
OCAUTION
• Install a manual gas shut-off valve between the gas supply
line and the boiler.
• A sediment trap must be provided upstream of the gas
controls.
__CLOSE: 195 n _
MA)COPEM "5--
BYPASS: 5 Y
Excess Flow Valve
38 Connecting the Gas Supply
Typical LP Gas piping examples:
2 Stage System with Multiple Regulators (Recommended)
Gas Regulator (2 Stage)
High Pressure
Regulator
egulator
g home
all size
as Pipe
Single Regulator System
Gas Regulator
(12"WC)
all size
as Pipe
Connecting the Gas Supply 39
6.1 Gas Pipe Sizing Tables
The following tables are referenced from 2012 National Fuel Gas Code for reference only. Please consult the gas pipe manufacturer for actual
pipe capacities.
Maximum Natural Gas Delivery Capacity
in Cubic Feet (ft') per Hour (0.60 Specific Gravity; 0.5 in WC Pressure Drop). Contact your gas supplier for BTU/ft' ratings. Use 1,000 BTU/ft' for
simplified calculations. This table is recommended for supply pressures less than 6 in WC.
Length (including fittings)
Pipe Size
loft
(3 m)
20 ft
(6 m)
30 ft
(9 m)
40 ft
(12 m)
50 ft
(15 m)
60 ft
(18 m)
70 ft
(21 m)
80 ft
(24 m)
90 ft
(27 m)
100 ft
(30 m)
125 ft
(38 m)
3/4in
360
247
199
170
151
137
126
117
110
104
92
1in
678
466
374
320
284
257
237
220
207
195
173
1 1/4 in
1,390
957
768
657
583
528
486
452
424
400
355
1'/2in
2,090
1,430
1,150
985
873
791
728
677
635
600
532
2in
4,020
2,760
2,220
1,900
1,680
1,520
1,400
1,300
1,220
1,160
1,020
21/2 in
6,400
4,400
3,530
3,020
2,680
2,430
2,230
2,080
1,950
1,840
1,630
3 in
11,300
7,780
6,250
5,350
4,740
4,290
3,950
3,670
3,450
3,260
2,890
4in
23,100
15,900
12,700
10,900
9,660
8,760
8,050
7,490
7,030
6,640
5,890
in Cubic Feet (ft') per Hour (0.60 Specific Gravity; 3.0 in WC Pressure Drop). Contact your gas supplier for BTU/ft3 ratings. Use 1,000 BTU/ft3 for
simplified calculations. This table is recommended for supply pressures of 6 in WC or greater.
Length (including fittings)
Pipe Size
loft
(3 m)
20 ft
(6 m)
30 ft
(9 m)
40 ft
(12 m)
50 ft
0 5 m)
60 ft
0 8 m)
70 ft
(21 m)
80 ft
(24 m)
90 ft
(27 m)
100 ft
(30 m)
125 ft
(38 m)
'/2in
454
312
250
214
190
172
158
147
138
131
116
3/4in
949
652
524
448
397
360
331
308
289
273
242
1 in
1,787
1,228
986
844
748
678
624
580
544
514
456
1'/4in
3,669
2,522
2,025
1,733
1,536
1,392
1,280
1,191
1,118
1,056
936
1'/2in
5,497
3,778
3,034
2,597
2,302
2,085
1,919
1,785
1,675
1,582
1,402
2in
10,588
7,277
5,844
5,001
4,433
4,016
3,695
3,437
3,225
3,046
2,700
21/2 in
16,875
11,598
9,314
7,971
7,065
6,401
5,889
5,479
5,140
4,856
4,303
3 in
29,832
20,503
16,465
14,092
12,489
11,316
10,411
9,685
9,087
8,584
7,608
4in
43,678
30,020
24,107
20,632
18,286
16,569
15,243
14,181
13,305
12,568
11,139
40 Connecting the Gas Supply
Maximum Liquefied Propane Delivery Capacity
in Thousands of BTU/H (0.5 in WC Pressure Drop)
Length (including fittings)
Pipe Size
loft
(3 m)
20 ft
(6 m)
30 ft
(9 m)
40 ft
(12 m)
50 ft
05 m)
60 ft
08 m)
80 ft
(24 m)
100 ft
(30 m)
125 ft
(38 m)
150 ft
(45 m)
175 ft
(53 m)
200 ft
(60 m)
250 ft
(76 m)
1
/2in
291
200
160
137
122
110
101
94
89
84
74
67
62
3/4in
608
418
336
287
255
231
212
197
185
175
155
140
129
tin
1,150
787
632
541
480
434
400
372
349
330
292
265
243
1'/4in
2,350
1,620
1,300
1,110
985
892
821
763
716
677
600
543
500
11/2in
3,520
2,420
1,940
1,660
1,480
1,340
1,230
1,140
1,070
1,010
899
814
749
2 in
6,790
4,660
3,750
3,210
2,840
2,570
2,370
2,200
2,070
1,950
1,730
1,570
1,440
6.2 Measuring the Inlet Gas Pressure
Q WARNING
The boiler cannot function properly without sufficient inlet gas pressure. Measuring the inlet gas pressure should be performed by a
licensed professional only.
• The inlet gas pressure must be maintained between 3.5 in and 10.5 in WC for natural gas and between 8.0 in and 13.5 in WC for liquefied
propane.
• The appliance and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that
system at test pressures in excess of psi (3.5 kPa).
• The appliance must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing
of the gas supply piping system at test pressures equal to or less than psi (3.5 kPa).
If gas pressure is out of the acceptable range or an excessive pressure drop is observed, contact the gas supplier or a qualified
installer to supply proper gas pressure to the unit.
Connecting the Gas Supply 41
To measure the inlet gas pressure:
1. Shut off the manual gas valve on the gas supply line.
H I __I�
Gas Valve a Opened Closed
2. Open a hot water faucet. The boiler should turn on and the gas
in the gas supply line will be purged.
3. Leave the faucet on until the boiler shuts down due to a lack of
gas supply, and then turn off the hot water faucet.
4. Unclasp the 3 buckles that fix the cover to the boiler, and then
remove the cover by lifting it and pulling it outward.
OCAUTION
Ensure that no cables are in the way before folding down the
PCB assembly. If the assembly is stuck, do not force it. Doing
so may damage the cables and result in serious malfunctions.
Check again to ensure that no cables or any other parts are in
the way before you proceed.
5. Loosen the screws indicated in the figure below and connect a
manometer to the pressure port. Reset the manometer to zero
before use.
manometer
6. Re -open the manual gas valve and check for leaks.
7. Open multiple fixtures that have high flow rates, such as
bathtub and shower faucets, to ramp the boiler up to its
maximum firing rate.
8. When the boiler reaches its maximum firing rate, check the
inlet gas pressure reading on the manometer. The gas pressure
must fall within the ranges specified on page 8.
1= 11 I I I
I.I I I I
O
O
42 Connecting the Gas Supply
7. Venting the Boiler
A DANGER
This appliance is certified as a "Category IV" appliance and
requires a special venting system.The vent system will operate
with a positive pressure in the pipe. Exhaust gases must be
piped directly outdoors using the vent materials and rules
outlined in these instructions. Do not connect vent connectors
serving appliances vented by natural draft into any portion of
mechanical draft systems operating under positive pressure.
Follow the venting instructions carefully. Failure to do so will
result in substantial property damage, severe personal injury,
or death.
QWARNING
Improperventing of the boilercan result in excessive levels of
carbon monoxide, which can lead to severe personal injury
or death. This boiler must be vented in accordance with
the "Venting of Equipment" section of the latest edition
of the ANSI Z223.1/NFPA 54 Natural Fuel Gas Code in
the USA and/or the "Venting systems and air supply for
boilers" section of the latest version of the CAN/CGA
B149.1 Natural Gas and Propane Installation Code in
Canada, as well as all applicable local building codes and
regulations. Follow all instructions and guidelines when
venting the boiler. Venting should be performed only by a
licensed professional.
• The venting system must be sealed gastight to prevent flue
gas spillage and carbon monoxide emissions, which will
result in severe personal injury or death.
• The building owner is responsible for keeping the exhaust
and intake terminations free of snow, ice, or other potential
blockages, as well as scheduling routine maintenance.
Blocked or obstructed vent piping terminations could result
in property damage, severe personal injury, or death.
The boiler must be properly vented to ensure a constant supply of
clean intake air and to ensure that exhaust air is properly removed
from living areas. When venting the boiler, follow these guidelines:
• Do not install the boiler in areas with contaminated air
(containing a high level of dust, sawdust, sand, flour, aerosols,
or any other such airborne contaminants), as contaminants
can cause operational problems. The warranty does not cover
damage caused by contaminants in the installation area. If
you must install the boiler in an area with contaminated air,
use direct venting to supply air from outside the building. We
recommend regular filter cleaning and maintenance in these
areas.
• For best results, keep the venting system as short and straight as
possible.
• Locate the boiler as close as possible to the vent termination.
• Do not connect the boiler vent to a vent for any other gas boiler
or vent stack.
• For horizontal runs, slope the horizontal section upward toward
the vent termination at a rate of/4 in per foot (2% slope).
• Create an airtight seal at each joint in the exhaust and intake air
pipes from the boiler collar to the vent termination.
Connecting the Pipe to the Vent Collar
Do not use primer or cement on the appliance
connection.
QWARNING
Ensure that the vent pipe is properly beveled prior to
installation and that the pipe is fully connected to the exhaust
gas vent fitting. Failure to properly bevel and install the pipe
can lead to gasket failure and flue gas leakage, which may
result in serious injury or death.
................ .
Venting the Boiler 43
1. Measure 1-3/4" inches from the end of the vent pipe, then
draw a mark at that distance.
Mark 1-3/4" from
the end of the pipe
1-3/4"
2. Insert the pipe into the vent collar to start the vent run. Make
sure to completely slide the vent into the collar until the end
makes contact with the bottom of the socket.
RM Verify that 1-3/4"of the pipe has been completely
inserted into the collar and that the mark is no longer
visible.
3. Tighten the clamp with a screwdriver to properly seal the joint.
OCAUTION
Do not start the vent run with a street elbow at the vent collar.
Using an elbow directly at the collar will not allow for a tight
seal between the appliances and vent pipe. A length of straight
pipe must be used when starting the vent run.
• To avoid moisture and frost build-up and to maintain clearances
to openings on adjacent homes, 45' elbows, 90° elbows, or tees
may be attached to the end of the termination vent pipe to
direct the exhaust plumes away from buildings, as long as the
total allowable vent lengths, maximum number of elbows, and
distances to air intake restrictions are observed.
• Do not store hazardous or flammable substances near the vent
termination.
• If this boiler will be installed in areas where snow is known to
accumulate, protect the vent termination from blockage.
• Provide a minimum of 1 foot clearance from the bottom of the
exhaust above the expected snow accumulation level. Snow
removal may be necessary to maintain clearance.
• Ensure that the vent termination is at least 12 in (305 mm) above
ground, 12" (305 mm) above the highest anticipated snow level,
or as required by local codes, whichever is greater.
• Support the vent pipe with hangers at regular intervals or as
required by local codes.
• Exhaust and intake air pipes must be glued and properly
supported at least every 4 ft (1.2 m).
• The vent for this appliance shall not terminate over public
walkways; or near soffit vents or crawl space vents or where
condensate or vapor could create a nuisance or hazard or cause
property damage; or where condensate or vapor could cause
damage or could be detrimental to the operation of regulators,
relief valves, or other equipment.
A DANGER
If the connections leak, harmful flue gas may cause personal
injury or death. After completing the installation and filling
the boiler with water, turn on the boiler and test for leaks using
a bubble test kit. After applying the soap solution, bubbles will
form on the connection if any leaks exist.
44 Venting the Boiler
7.1 Selecting a Vent Type
All boilers are prepared at the factory to be direct vented (sealed combustion). Navien recommends direct air vent installations whenever
possible to avoid back drafting cold air through the boiler unit. If you cannot use a direct vent, ensure that an ample supply of make-up air is
available in the installation location.
Navien also recommends installing a new vent system with this appliance. If reusing an existing vent system, thoroughly inspect it for
punctures, cracks, or blockages prior to connecting it to the boiler.
Direct Venting
The boiler uses 2 in or 3 in diameter exhaust and 2 in or 3 in diameter intake air ducts. To ensure the draw of air directly from and exhaust of air
directly to the outside of the building, create an airtight seal from the boiler collar to the vent termination.
Intake materials can be made of ABS, PVC, CPVC, PP, galvanized steel, corrugated aluminum or any other such materials. If you use a
corrugated material, ensure that there is not inadvertent crimping of, or damage to, the intake air pipe.
When using direct venting, maintain the following venting clearances, as required by ANSI Z21.10.3 and the National Fuel Gas Code, ANSI
Z223.1 /NFPA 54, and CAN/CGA B149.1 Natural Gas and Propane Installation Code:
�I�NTRpl- pil.
' I
® Vent Terminal
r,.
Ref
Description
Canadian Direct Vent Installations'
12 in (30 cm)
US Direct Vent Installations'
12 in (30 cm)
A
Clearance above grade, veranda, porch, deck, or balcony
B
Clearance to window or door that may be opened
36 in (91 cm)
12 in (30 cm)
C
Clearance to permanently closed window
D
Vertical clearance to ventilated soffit located above the
terminal within a horizontal distance of 2 ft (61 cm) from
the center line of the terminal
E
Clearance to unventilated soffit
Venting the Boiler 45
Ref
Description
Canadian Direct Vent Installations'
US Direct Vent Installations'
F
Clearance to outside corner
G
Clearance to inside corner
Clearance to each side of center line extended above
3 ft (91 cm) within a height
H
meter/regulator assembly
15 ft above the meter/regulator
assembly
I
Clearance to service regulator vent outlet
3 ft (91 cm)
Clearance to nonmechanical air supply inlet to building
36 in (91 cm)
12 in (30 cm)
or the combustion air inlet to any other appliance
K
Clearance to a mechanical air supply inlet
pp y
6 ft (1.83 m)
3 ft (91 cm) above if within
10 ft (3 m) horizontally
L
Clearance above paved sidewalk or paved driveway
7 ft (2.13 m)t
located on public property
M
Clearance under veranda, porch deck, or balcony
12 in (30 cm)*
1 In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code
2 In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code
t A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
* Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier.
46 Venting the Boiler
Non -Direct Venting (Single Pipe)
If, at any time, the installation location could experience negative
pressure, there is a possibility of back drafting cold air through the
boiler's heat exchanger. This situation could lead to the freezing of
the heat exchanger and malfunction of the boiler.
However, building codes in most jurisdictions disallow negative
pressures in residences. In a home with a well-balanced air supply,
the heat exchanger should not be in danger of freezing. Because
the cause of back drafting is not considered a manufacturing
problem, any freezing damage which occurs from back drafting
will not be covered by the Navien warranty. If there is any question
about the possibility of back drafting in the installation location,
use a direct venting system for the boiler.
When using non -direct venting, maintain non -direct vent
clearances shown on page 48 as required by ANSI Z21.10.3 and
the National Fuel Gas Code, ANSI Z223.1 /NFPA 54, and CAN/
CSA B149.1 Natural Gas And Propane Installation Code.
To use non -direct venting for the boiler:
1. Insert the termination end cap into the intake air duct. Do not
glue the end cap, to allow for easy removal and cleaning of the
ca p.
Vent Termination Cap 2 in
Coupling 2 in
Vent Pipe 2 in
2. Provide two openings to allow for circulation of combustion air
as specified by ANSI Z223.1 /NFPA 54 or CAN/CGA B-149.1:
Outdoor
Indoor make
make up air is
up air is
Maximum
provided,
provided,
Input
a minimum free
a minimum free
(BTU/H)
area of 1 in',
area of 1 in 2,
per4,000
per 1,000
16
BTU/H
BTU/H
30 in'
120 in'
NCB-150E
120,000
10in(W)x4
11 '/a in (W)
in (H) or 6 in
x 11 'Ain (H)
round
40 in
150 in
NCB-180E
150,000
10in(W)x4
12'/4 in (W)
in (H) or 7 in
x 121/4 in (H)
round
45 in'
175 in
NCB-210E
180,000
10in(W)x5
13'/a in (W)
in (H) or 8 in
x 13'/4 in (H)
round
50 in'
199 in
NCB-240E
199,000
10in(W)x5
14'/4 in (W)
in (H) or 8 in
x 14'/4 in (H)
round
Venting the Boiler 47
ttys9EL ® Vent Terminal
�pg1EA �
jo
o Air Supph inlet
® Area where vent
terminal is not permitted
Q
Ref
Description
Canadian Non -Direct Vent US Non -Direct Vent
Installations Installations
12 in (30 cm) 12 in (30 cm)
A
Clearance above grade, veranda, porch, deck, or balcony
48 in (120 cm) below or to side
B
Clearance to window or door that may be opened
36 in (91 cm)
of opening; 12 in (30 cm) above
opening
C
Clearance to permanently closed window
Vertical clearance to ventilated soffit located above the
D
terminal within a horizontal distance of 2 feet (61 cm) from
the center line of the terminal
E
Clearance to unventilated soffit
F
Clearance to outside corner
G
Clearance to inside corner
Clearance to each side of center line extended above
36 in (91 cm) within a height
H
meter/regulator assembly
15 ft (4.57 m) above the meter/
regulator assembly
I
Clearance to service regulator vent outlet
36 in (91 cm)
Clearance to non -mechanical air supply inlet to building or
48 in (120 cm) below or to side
the combustion air inlet to any other appliance
36 in (91 cm)
of opening; 12 in (30 cm) above
opening
K
Clearance to a mechanical air supply inlet
6 ft (1.83 m)
36 in (91 cm) above if within 10 ft(3
m) horizontally
L
Clearance above paved sidewalk or paved driveway
7 ft (2.13 m)t
located on public property
M
Clearance under veranda, porch deck, or balcony
12 in (30 cm)*
1 In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code
2 In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code
t A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
* Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier.
48 Venting the Boiler
7.2 Selecting Vent Pipe Materials
Venting requirements differ in the US and Canada. Consult
the following chart or the most recent edition of ANSI Z223.1 /
NFPA 54 or CAN/CGA 6149.1, as well as all applicable local codes
and regulations when selecting vent pipe materials. Do not
use cellular core PVC (ASTM F891), cellular core CPVC, Radel®
(polyphenolsulfone) for the exhaust vent.
Q WARNING
Do not mix components from different systems. The vent
system may fail and harmful flue products may leak into the
living space. Mixing of venting materials will void the warranty
and certification of the appliance.
ocale
Recommended Vent Materials
• PVC Schedule 40 or 80 (Solid Core)
USA
Approved Polypropylene (PP)
• Approved Stainless Steel (SS)
• Type BH Special Gas Vent Class IIA (PVC)
Canada*
Type BH Special Gas Vent Class 1113 (CPVC)
• Type BH Special Gas Vent Class IIC
(Polypropylene/Stainless Steel)
* For installation in Canada, field -supplied plastic vent piping must comply
with CAN/CGA B149.1 (latest edition) and be certified to the Standard
For Type BH Gas Venting Systems, ULC-S636. Components of this listed
system must not be interchanged with other vent systems or unlisted
pipes or fittings. All plastic components and specified primers and glues
of the certified vent system must be from a single system manufacturer
and must not be intermixed with another system manufacturer's parts.
The supplied vent connector and vent termination are certified as part of
the boiler.
This product is set to use PVC as the default vent pipe material. If
you require that return water hotter than 140°F (60°C) to circulate
back to boiler, the DIP switch must be configured (Dip Switch 2,
switch #8 to ON position). Otherwise, the boiler will control and
maintain the flue and DHW temperature below 150'F (65'C) and
140°F (60°C) respectively.
• When PCB DIP switch 2 #8 is set to Off (factory
default), the boiler does not operate without an
exhaust thermostat installed.
• When you set PCB DIP switch 2 #8 to On, ensure
that CPVC, polypropylene or stainless steel piping is
used for exhaust venting.
�ONu(nuoo 000000LE
2 3 4 7 8
OCAUTION
This boiler has a built-in control to limit the exhaust
temperature to 149°F (65'C). As a result, the boiler can be
vented with Schedule 40 PVC.
• In high temperature applications, the exhaust temperature
can exceed 149'F (65'C). In that case, you must use Schedule
40 or 80 CPVC or Approved Polypropylene in the USA
or Type BH Special Gas Vent Class 1113 (CPVC) or Class IC
(Polypropylene) that conforms to ULC-S636 in Canada.
• When using 2 in. vent, if the exhaust temperature exceeds
149'F (65'C), CPVC pipe (field supplied) must be used for the
first 3 feet of equivalent pipe length. For system using 3 in.
vent, the first 5 in. of length must be CPVC pipe.
Venting the Boiler 49
The following polypropylene vent components are approved for
use with this appliance:
Duravent PolyPro® SW (Rigid)
2PPS-xxx (2") or 3PPS-xxx (3")
Duravent PolyPro® (Flexible)
3PPS-FLEXxx (3")
2PPS-FAM or 3PPS-FAM (2"or 3"Rigi d-to-Flex Male Adapter)
2PPS-X3L (2"to 3" Increa ser)
Centrotherm Innoflue® SW (Rigid)
ISxx02xx (21 or ISxx03xx (3")
Centrotherm Innoflue® (Flexible)
IFVL02xxx (2") or IFVL03x xx (3")
IFSFCO2 or IFSFC03 (2" or 3" Rigid -to- Flex Male Adapter)
ISE10203 or ISIA0203 (2"t o 3" Increaser)
Hart & Cooley Poly flue" SW (Rigid)
2PF-xx (2") or 3PF-xx (3")
Z-Flex Z-DENS SW (Rigid)
2ZDP_(2" or 3")
The following stainless steel vent components are approved for
use with this appliance:
Duravent FasNSeal® (Rigid)
FSA-PVC3 (3" PVC to FasN Seal Appliance Adapter)
FSxxxxx03 (3")
Duravent FasNSeal® (Flexible)
FSASMM-PP-2 (2" PP-to-F asNSeal adapter)
FSFLEX-02 (2")
Heat Fab Saf-T Vent® EZ Seal
9301 PVC (3" PVC/CPVC Outlet Boiler Adapter)
93xx (3")
• Only the vent pipe models listed above are
approved for use with this appliance.
• Proper appliance adapters must be used when
using polypropylene or SS vent pipe.
• Refer to the vent manufacturer's instructions for
detailed installation procedures and guidelines.
• Do not use Schedule 40 or 80 polypropylene pipe
used for water or waste systems within the vent
run.
7.3 Measuring Vent Length
The maximum vent length when using 2 in exhaust ducts is 60 ft
(18 m). The maximum vent length when using 3 in vent ducts
is 150 ft (45 m). The intake duct length may be identical to the
exhaust duct length. Maximum vent lengths reduces according to
the number of elbows used, as shown in the following table:
Vent Size
Maximum
Length
Maximum
# of Elbows
Equivalent Length
Reducethe
maximum vent
length accordingly
for each elbow used:
2 in.
60 ft (18 m)
6
Each 90' elbow
equates to 8 linear
feet of vent
• Each 45° elbow
equates to 4 linear
feet of vent
Reducethe
maximum vent
length accordingly
for each elbow used:
3 in.
150 ft (45 m)
8
Each 90° elbow
equates to 5 linear
feet of vent
• Each 45° elbow
equates to 3 linear
feet of vent
• The Maximum Length does not include any elbows.
• The use of a PVC or polypropylene concentric
termination counts as 5 linear feet (1.5 m) of vent.
50 Venting the Boiler
7.4 Terminating the Vent
Before installing the boiler, determine what type of vent
termination is appropriate for the installation location and
situation. The subsections that follow describe some typical
venting configurations, but do not include all possible options.
The following PVC vent terminations are approved for use with
this appliance:
• PVC Concentric Vent Kit (Sch 40 - UL 1738/ULC 5636):
2 in Vent Kit
3 in Vent Kit
• IPEX Low Profile Termination Kit:
2 in Low Profile Vent Kit #196984
3 in Low Profile Vent Kit #193985
The following polypropylene vent terminations are approved for
use:
• Duravent PolyPro® Horizontal Concentric Termination Kit
2 in x 4 in Concentric Vent Kit #2PPS-HKL
3 in x 5 in Concentric Vent Kit #3PPS-HKL
• Centrotherm Innoflue® Low Profile Termination Kit
2 in Vent Kit #ISLPT0202
3 in Vent Kit #ISLPT0303
• Hart & Cooley Polyflue— Horizontal Termination Kit
2 in Vent Kit #2PF-HCT
3 in Vent Kit #3PF-HCT
The following polypropylene vent components can be used as
terminations:
Duravent PolyPro®
2PPS-E90L or 3PPS-E90L (2" or 3"90° Elbow)
2PPS-E45L or 3PPS-E45L (2" or 3"45° Elbow)
2PPS-TL or 3PPS-TL (2" or 3"Tee)
2PPS-BG or 3PPS-BG (2" o r 3" Birdscreen)
Centrotherm Innoflue®
ISELL0287 or ISELL0387 (2"or 3"87° Elbow)
ISELL0245 or ISELL0345 (2"or 3"45° Elbow)
IST02 or IST03 (2" or 3"Tee)
IASPP02 or IASPP03 (2" or 3" Birdscreen)
Hart & Cooley Polyflue"
2PF-90 or 3PF-90 (2"or 3"90° Elbow)
2PF-45 or 3PF-45 (2" or 3"45° Elbow)
2PF-T or 3PF-T (2" or 3"Tee)
2PF-HVST or 3PF-HVST (2"or 3" Birdscreen)
The following stainless steel (AL29-4C) vent components can be
used as terminations:
Duravent FasNSeal°
FSELB9003 (3"90° Elbow)
FSELB8803 (3"88° Elbow)
FSELB4503 (3"45° Elbow)
FST3 (3"Tee)
FSBS3 (3"Birdscreen)
Heat Fab Saf-T Vent® EZ Seal
9314(LR) or 9314TERM (3" 90° Elbow)
9311 (3"45° Elbow)
9390TEE (3"Tee)
9392 (3" Birdscreen)
• Only the termination models listed above are
approved for use with this appliance.
• Only terminations of the same manufacturer as the
vent system must be used.
• Refer to the vent manufacturer's instructions for
detailed installation procedures and guidelines.
Venting the Boiler 51
Indoor Boiler Installation Venting Examples
The following are some possible indoor venting options:
• 2 in or 3 in Two -pipe Sidewall Venting
_..,1 min-
E
0
0
M
Exterior View
• Non -Concentric Sidewall Venting -Air is drawn from a different
location that is at least 12 in (300 mm) away from the exhaust
termination. The exhaust termination can be located either on
the sidewall or roof. Try to minimize the length of the intake air
pipe when installing the vent.
*12"(300mm) above the highest anticipated snow level, or as required by
local codes, whichever is greater
• Concentric Sidewall Venting
Com
Vent
Maintain 12"
(300mm) min.
clearance above
highest anticipated
snow level or grade,
which is greater.
52 Venting the Boiler
Indoor Boiler Installation Venting Examples (continued)
• Concentric Roof Venting
Vent
1
Maintain 12"(300mm) min.
clearance above highest
anticipated snow level or grade,
whichever is greater (maximum
of 24"above roof).
For cascade applications, the required horizontal
clearance between terminations is 12"for both
sidewall and vertical venting installations.
Do not vertically stack concentric
terminations on sidewalls.
• Low Profile Two -Pipe Sidewall Venting*
Intake Air
(from outdoors)
Exhaust
(from appliance)
E
E
E
0
M
/ Exterior View
* IPEX and Centrotherm Low Profile terminations only
** Clearance above highest anticipated snow level or grade, or as
required by local codes, whichever is greater
Only the following orientations are allowed for twin
pipe terminations.
I I I
• Flexible Vent Systems (Polypropylene or Stainless Steel)
0
• Only VERTICAL installations are allowed.
Horizontal terminations are prohibited.
• The use of proper adapters and supports are required
to fully complete the installation.
The following table lists the model types approved for use with
the Centrotherm / Duravent exible vent pipes and the maximum
allowable length of the vent system.
Flexible PP
Flexible SS
Model Type
yp
Vent
Dia.
Centrotherm
Duravent
Duravent
Innoflue Flex*
Polypro Flex*
FasNSeal**
NCB-
2 in
35 ft
n/a
35 ft
3 in
100 ft
n/a
150/180/210
2 in
n/a n/a
35 ft
NCB-240
3 in
100 ft
n/a
• Only the flexible vent models listed above are approved for use
with this appliance.
• All flexible vent pipe must be installed VERTICALLY through the
roof. No horizontal terminations are permitted.
• Use a 2 in snap fit coupler or the InnoFlue® Single Wall
Residential vent pipe to connect the InnoFlue® Flex 2 in vent
pipes to the exhaust.
• After installation, ensure that the vent system is tightly sealed at
the joints.
• All installation using the flexible vent materials must be in
INDIRECTVENTING only.
• Refer to the manufacturer's literature for detailed information
and guidelines.
Venting the Boiler 53
8. Setting the DIP Switches
OCAUTION
• Do not remove the front cover unless the power to the
boiler is turned off or disconnected. Failure to do so may
result in electric shock.
• Configure only the DIP switches that require adjustment
according to the instructions in this manual. Do not adjust
any other DIP switches.
The boiler has 2 sets of DIP switches on the main circuit board
(PCB) and 2 sets of DIP switches on the front panel. DIP switches
are used to control the functionality of the boiler. Set the DIP
switches appropriately, based on the installation environment.
8.1 PCB DIP Switches
DIP Switch 2 (Set of 8)
The DIP SW 2 on the circuit board configures additional features at
the time of installation, such as temperature control modes.
N ON
I 2 3 4 5 6 _LjMML G 7 8
Switch
Function
Setting
Temperature
Return Water
1-ON
Control
Supply Water
1-OFF
Unused (Permanent
Thermostat
Space Heating
7-ON
7
or Zone
Demand)
Controller
Used
7-OFF
Temperature Limit
8-ON
8
Exhaust
Unused (CPVC)
Thermostat
Setting (PVC)
8-OFF
• When PCB DIP switch 2 #8 is set to Off (factory
default), the boiler does not operate without an
exhaust thermostat installed.
• When you set PCB DIP switch 2 #8 to On, ensure
that CPVC, polypropylene or stainless steel piping is
used for exhaust venting.
54 Setting the DIP Switches
8.2 Front Panel DIP Switches
DIP Switch 1 (Set of 1
The DIP SW 1 on the front panel configures the temperature unit,
well pump, high altitude settings, and lime alarm cycle (for slave
units).
Before changing the settings, lift the rubber cover to access the
front panel DIP switches.
ON ON
1 2 3 4 5 2
1 2 3 4 6 6 7 8 9 10 1 2
Switch
Function
Setting
2
Temperature
Unit
°C (Celsius)
2-ON
°F (Fahrenheit)
2-OFF
3
Well Pump
On
3-ON
Off
3-OFF
9 & 10
Lime Alarm*
Unused
9-OFF, 10-OFF
6 months
9-ON,10-OFF
12 months
9-OFF, 10-ON
24 months
9-ON,10-ON
* Sets the lime alarm cycle of the slave units when a cascade configuration
is in use.
DIP Switch 2 (Set of 2)
The DIP SW 2 on the front panel configures the cascade vent and
gas type settings.
Before changing the settings, lift the rubber cover to access the
front panel DIP switches.
ON ON
7711111111 11
1 2 3 41& 6 7 8 9 10 1 2
�If�1���01�11
Switch
Function
Setting
1
Cascade Vent
Common Vent
1-OFF
Individual Vent
1-ON
2
GasType
Natural Gas
2-OFF
Propane Gas
2-ON
Setting the DIP Switches 55
9. Connecting the Power Supply
Q WARNING
Improperly connecting the power supply can result in electrical
shock and electrocution. Follow all applicable electrical codes
of the local authority having jurisdiction. In the absence of
such requirements, follow the latest edition of the National
Electrical Code (NFPA 70) in the USA or the latest edition
of CSA C22.1 Canadian Electrical Code Part 1 in Canada.
Connecting the power supply should be performed only by a
licensed professional.
When connecting the power supply, follow these guidelines
• Do not connect the electric supply until all plumbing and gas
piping is complete and the boiler has been filled with water.
• Do not connect the boiler to a 220-240V AC power supply. Doing
so will damage the boiler and void the warranty.
• All the Navien NCB-E boilers come with a factory -installed,
3-pronged (grounded) plug. The boiler can be plugged into any
grounded electrical outlet nearby, as it requires only 2 Amps. It is
not necessary to run a dedicated electrical line to the boiler.
• Keep the power cord free of dust.
• Do not use a broken or modified power cord.
• Do not bind, bend or stretch power cords.
• If local codes require the boiler to be wired directly, remove
and discard the factory -installed plug. Install a power switch
between the breaker and the boiler to facilitate end -user
maintenance and servicing. Connect the boiler to a 110-120V AC
at 60 Hz with a maximum of 2A.
• The boiler must be electrically grounded. If using the power
plug, ensure that the electrical outlet you connect the boiler
to is properly grounded. If wiring the boiler directly to a power
supply, do not attach the ground wire to either the gas or the
water piping as plastic pipe or dielectric unions may prevent
proper grounding.
• We recommend using a surge protector to protect the boiler
from power surges.
• If there is a power failure in cold weather areas, the freeze
prevention system in the boiler will not operate and may result
in the heat exchanger freezing. In cold areas where power
failures are common, you must completely drain the boiler
to prevent damage if power cuts last for extended periods.
A battery back-up (available at most computer retailers) may
be used to supply hot water during power outages. Damage
caused by freezing temperatures due to power loss is not
covered under warranty.
If you are not using your boiler for a long period of time:
1. Completely drain the water out of the boiler.
2. Disconnect the power supply to the boiler.
This prevents your boiler from freezing and being damaged.
OCAUTION
Label all wires before disconnecting them when you work on
the controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
56 Connecting the Power Supply
10. Installation Checklist
After installing the boiler, review the following checklist. You should be able to answer "Yes" to all of the items in the checklist. If not, review the
appropriate sections to complete the installation. To troubleshoot any operational problems refer to"Troubleshooting" in the Owner's Manual.
If you have additional questions or need assistance with installation, contact Technical Support at 1-800-519-8794 or 1-949-420-0420, or refer
to the technical support section of Navien's website (www.navien.com).
Installing the boiler
Yes
No
Have you maintained the required clearances from building openings and intake air vents?
Have you minimized the distance between the boiler and the vent termination?
Have you minimized the distance between the boiler and major fixtures?
Have you maintained the proper service and maintenance clearances?
Is the make-up air supply sufficient for proper operation?
Is the make-up air supply free from dust, dirt, corrosive elements, and flammable vapors?
Is the boiler and vent piping clear of combustible materials, including clothing, cleaning materials, and rags?
Connecting the Gas Supply
Yes
No
Does the gas supply match the type specified on the boiler's rating plate?
Is the gas line at least'/z or 1/4 in ID (Inner Diameter)?
Is the gas supply line sufficient in length and diameter to deliver the required BTUs?
Have you measured the pressure of the gas supply line?
Is the gas supply pressure within the recommended ranges specified in this manual?
Is the gas supply line equipped with a manual shut-off valve?
Have you tested the gas line pressure and all fittings for leaks?
Has the gas company inspected the installation, if required?
Connecting the Domestic Water Supply
Yes
No
Is the water supply pressure sufficient (greater than 40 psi)?
Have you installed shut off valves on the inlet and outlet to facilitate cleaning of the inlet water filter?
Have you bled the air out at each fixture?
Have you checked each fixture to ensure hot water is being supplied?
Have you cleaned the inlet water filter?
If you installed a recirculation line, have you insulated the hot water pipes and the return line?
Installation Check list 57
Connecting the Space Heating Piping
Has the system been filled (less than 30 psi) and purged of air?
Yes
No
Does the piping incorporate means for air removal (scoop, separator, etc.)?
Is there an expansion tank installed and set to the proper system pressure?
If antifreeze has been used, is it the proper type and is the concentration appropriate?
If an external low water cut off (LWCO) is installed, is it wired to the boiler?
Connecting a Pressure Relief Valve A
Yes
No
Have you installed an approved pressure relief valve on the boiler?
Does the rating of the pressure relief valve match or exceed the maximum BTU rating of the boiler?
Is the pressure relief valve 1/4 in on the hot water outlet and 1/4 in on the space heating outlet?
Have you installed the pressure relief valves to the pressure relief valve adapter, and on the space heating pipe near the
boiler?
Have you installed a discharge drain tube from the pressure relief valve to within 6-12 in (150-300 mm) of the floor?
Connecting the Condensate Drain Yes No
Have you installed a condensate drain line from the boiler to a drain or laundry tub?
Venting the boiler
Yes
No
Have you vented the boiler with 2 in or 3 in PVC, CPVC, Polypropylene, Stainless Steel,Type BH Special Gas Vent
(ULC-5636) for Category IV boilers (Canada), or in accordance with all local codes and the guidelines in this manual?
Have you ensured that ABS or PVC cellular core pipe has not been used as venting for the boiler?
Is the vent sloped upward toward the vent termination at a rate of /4 in per foot (2% grade)?
Are all vent runs properly supported?
Have you properly supported the vent termination?
Have you properly sealed all air intake and exhaustjoints, from the flue collar to the vent termination?
Have you installed end caps on the exhaust and intake pipes?
Have you checked the venting for leaks?
Is the vent termination at least 12 in (300mm) above the exterior grade?
Have you ensured that sufficient make-up air is available?
Is the total vent length within the maximum vent length restriction?
58 Installation Check list
Connecting the Power Supply
Yes
No
Is the supplied voltage 110-120V AC?
Is the boiler plugged into a properly grounded outlet?
If you have made a direct power supply connection, have you installed a power switch to facilitate end -user
maintenance?
Have you checked the polarity of the electrical connection?
Is the system properly set up for cascading operation (master and slave boilers), if applicable?
PCB DIP switch setting (DIP SW 2, set of 8) Yes No
Is switch #1 set correctly for Return Water Control (ON) or Supply Water Control (OFF)?
If continuous boiler operation is required, is switch #7 in the up (ON) position?
If high temperature venting has been installed (CPVC or polypropylene), is switch #8 in the up (ON) position?
Front Panel DIP switch setting (DIP SW 1, set of 10) Yes No
Is switch #2 set correctly for Celsius (ON) or Fahrenheit (OFF)?
Unless using the well pump, is switch #3 set in the down (OFF) position?
Is switch #8 set correctly for the installation altitude?
Front Panel DIP switch setting (DIP SW 2, set of 2) Yes No
Is switch #2 set correctly for natural gas (OFF) or propane gas (ON)?
Operating the boiler
Have you shown the owner how to clean the inlet water filter?
Yes
No
Have you given the Installation & Operation Manual and User's Information Manual to the owner for future reference?
Have you shown the owner how to shut off the gas in case of an emergency?
Installation Check list 59
11. Operating the Boiler for the First Time
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING: If you do not follow these instructions exactly, a fire or explosion
may result, causing property damage, personal injury or loss of life.
A. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do NOT try to
light the burner by hand.
B. BEFORE OPERATING, smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier
than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
Do NOT try to light any appliance.
Do NOT touch any electrical switch.
Do NOT use any phone in your building.
Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
If you cannot reach your gas supplier, call the fire department.
C. Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or turn by hand, don't
try to repair it, call a licensed professional. Force or attempted repair may result in a fire or explosion.
D. Do not use this appliance if any parts have been under water. Immediately call a licensed professional to inspect the appliance
and to replace any part of the control system and any gas control which has been under water.
OPERATING INSTRUCTIONS
1.
STOP! Read the safety information above this label.
2.
3.
Turn off all electrical power of the appliance.
Set the thermostat or other operating control to the lowest setting.
4.
This appliance is equipped with an ignition device which automatically
lights the burner. Do NOT try to light the burner by hand.
5.
Close the main gas shut off valve.
OPEN CLOSE
6.
Wait (5) minutes to clear out any gas. Then smell for gas around
Manual Gas Valve (Main Valve)
the appliance and near the floor.
If you smell gas, STOP! Follow "B" in the safety information above.
If you don't smell gas, go to the next step.
7.
Open the main shut off valve. h
8.
Turn on the appliance.
9.
Set the thermostat or other operation control to desired setting.
10.
If the appliance will not operate, follow the instructions "To Turn Off Gas To Appliance"
and call your service technician or gas
supplier.
TO TURN OFF GAS TO APPLIANCE
1. Turnoff all electric power to the appliance if service is to be performed.
2. Set the thermostat or other operating control to the lowest setting.
Close the main gas shut off valve.'.
ou Operating the Boiler
Q WARNING
• Ensure that the boiler is filled with water before turning on
the boiler for the first time. Turning on a boiler that is not
filled will damage the boiler and result in property damage,
severe personal injury, or death. Such damage is not covered
by wa rra nty.
• At initial fill up and during boiler startup and testing,
check system thoroughly for leaks. Repair all leaks before
proceeding further.
• Before starting the boiler, smell near the floor and around
the boiler for gas odorant or any unusual odor. Remove the
boiler front door and smell interior of boiler enclosure. Do
not proceed with startup if there is any indication of a gas
leak.
• If overheating occurs or the gas supply fails to shut off, do
not turn off electrical power to the circulating pump.Turning
off the circulation pump may aggravate the problem and
increase the chance of boiler damage. Instead, shut off the
gas supply to the boiler at the manual gas valve.
• If any part of the appliance has been submerged in water,
do not use this appliance and immediately call a qualified
service technician. The appliance must be replaced if it
has been submerged. Attempting to operate an appliance
that has been submerged could create numerous harmful
conditions, such as a potential gas leakage causing a fire
and/or explosion, or the release of mold, bacteria, or other
harmful particulates into the air. Operating a previously
submerged appliance could result in property damage,
severe personal injury, or death.
Do not try to light the burner manually. This appliance
is equipped with an electronic ignition device which
automatically lights the burner.
11.1 Turning the Boiler On or Off
To turn the boiler on or off, press the Power button for 0.3 seconds.
Before turning on the boiler for the first time, check
for proper venting and combustion air to the boiler,
and purge the gas and water lines to remove any air
pockets.
When the power is on, the water temperature of the space heating
supply will appear with the water pressure on the front panel
display in 5 second intervals.
• If the Air purge is operating, "Air"will appear with
the water pressure on the front panel display in
5 second intervals.
• When displaying the water temperature of the
space heating supply, the supply or return water
icon flashes, depending on the space heating
control mode.
Operating the Boiler 61
11.2 Adjusting the Temperature
11.2.1 Adjusting the Space Heating Temperature
To adjust the heating temperature:
1. Press the Mode button once. The space heating icon turns on
2. Press the + (Up) or -(Down) buttons until the desired
temperature appears on the display.
You can adjust the temperature while the display is flashing. Once
the display stops flashing, the temperature setting is stored.
• Take note of the original heating temperature in
case you want to restore it to the default.
• The default space heating supply water
temperature range is 104°F (40oC, Absolute MIN) to
180°F (82°C, Absolute MAX).
• The default space heating return water
temperature range is 86°F (30oC, Absolute MIN) to
1497 (65°C, Absolute MAX).
• You can adjust the temperature range in the
parameter settings menu.
• The boiler will retain your settings during a power
outage.
11.2.2 Adjusting the DHW Temperature
Q WARNING
Before adjusting the water temperature, read "To prevent
burns:" on page 6 carefully. Water above 120°F (52°C) can
cause instant scalding, severe burns, or death.
To adjust the water temperature:
1. Make sure that all hot water faucets are closed, and ensure that
the internal circulator and any external circulating pumps are
off.
2. Press the Mode button twice. The DHW mode icon turns on.
3. Press + (Up) or -(Down) buttons until the desired temperature
appears on the display.
You can adjust the temperature while the display is flashing. Once
the display stops flashing, the temperature setting is stored.
Temperature range
Adjusting the water
temperature
86-1207 (Fahrenheit mode)
1 *For VC increments
30-50 °C (Celsius mode)
120-140°F (Fahrenheit mode)
Press for 2 seconds to adjust in
50-60 °C (Celsius mode)
5°F or 2°C increments
The boiler will retain your settings during a power
outage.
62 Operating the Boiler
11.3 Viewing Basic Information
To view information about the boiler, press the Mode button three
times."INFO"will appear on the display.
Press the + (Up) or - (Down) buttons to switch between the
information types.
Display
Description
M O ® /Il
N/ NI/ INV N/
Space heating supply water
/h 1/h, IIN. 7N
Sl Ri O/R GPM psi
temperature (OF)
M ❑'1y Q❑ 111
IN / NI/ NV N/
Space heating return water
V I7r� , /NI.7N
S+ Rt OR GPM Psi
temperature (OF)
M®® FAII
N1I IN/ IN/, N/
Domestic hot water outlet
/NI 17K , AN, 7N
St Rt O/R GPM psi
temperature (OF)
M ❑� ® z
IN! NIA NO' N/
Sl Rt O/R GPM psi
Cold water inlet temperature (OF)
M OO o0 z
NA IN/ NVNV
Domestic hot water (DHW) flow rate
/NI 1/f , WN NNI
St Rt OR Psi
in GPM
Description
M O ❑0 01
Outdoor air temperature (OF)
NA NIA NO' N/
/hI l yls
(with optional Outdoor Temperature
,Vh
Si Rt OR GPM psi
Sensor only)
Outdoor reset curve
-: Not in use.
®O O
1: Finned tube baseboard
2: FAN coil
NA NIA IN/I Nh
3: Cast iron baseboard
AN 61.019.IKS
4: Low mass radiant
S1 Rt O/R GPM psi
5: High mass radiant
6: Radiator
7: Custom (set by installer)
M 0 ❑r� m
N/ N/I NI/ ' N/
IN I/hI,VIN , %h
Boost interval time (set by installer)
Sl R1 OR GPM PSI
M ❑./' ❑� m
N /I NI/ NVINI/
Space heating water pressure in PSI
I/ �I 1/h. AN I/N
SL Rt OR GPM
To exit information mode, press the Reset button.
11.4 Setting the Operation Mode
1. Using the Front Panel, press and hold the Diagnostics Button
for over 5 seconds until "] .PAR" is displayed.
Operating the Boiler 63
2. Press the + (Up) button two times to change the display to
"3.OPR".
3. Press the Mode Button once to access the Operation Mode
menu.
4. Press the + (Up) button once to set the boiler to operate at
1-stage MIN ("MINA").
5. To set the boiler to operate at DHW 2-stage MAX, press the +
(Up) button until "D.MX.2" is displayed.
6. To exit the Operation Mode setting and return the boiler to
normal operation, press the Reset button twice.
11.5 Setting the Parameters
You can modify parameter settings for boiler operations, such
as the space heating and DHW temperature ranges, in different
operating conditions. Follow the instructions below to enter the
Special Parameter mode and change parameter settings.
OCAUTION
Parameters must be set by a qualified professional with
an extensive understanding of the boiler system. Setting
parameters improperly may lead to property damage or injury.
1. Press and hold the Diagnostic button for 5 seconds to enter
the Special Parameter mode.
2. Press the + or -buttons to move to "1.PAR" (Parameter Setting
mode), and then press the Mode button. You will be asked
to enter a password ("PASS" is displayed). The factory default
password is"1234".
3. Press the Mode button and enter your 4-digit password. Use
the + or - buttons to increase or decrease numbers and the
Diagnostic button to move between digits.
4. When you are done, press the Mode button.
5. Press the + or - buttons to move to a parameter setting, and
then press the Mode button to enter the Parameter Edit mode.
6. Press the + or - buttons to change the parameter value.
7. When you are done, press the Mode button to save the
settings.
8. To exit the Special Parameter mode, press the Reset button
twice.
• If you enter an incorrect password 10 times or make
no inputs within 5 minutes, the boiler will return to
the Normal mode.
• To return to the previous mode, press the Reset
button.
• The Factory default password is"1234"
• If you make no inputs for 10 seconds in the
Parameter Edit mode, the current parameter value
will be saved automatically.
• Press and hold the Reset button in Parameter Edit
mode for 5 seconds to reset individual parameters
to their default values.
• When you reset one of the following parameters,
the corresponding parameter will be reset
automatically:
Supply absolute MIN or MAX
Return absolute MIN or MAX
Lowest Outdoor Temperature or Highest Outdoor
Temperature
Configuring the Outdoor Reset Control Mode
Display
Description
®Ong
No NIA W ' NA
ls �N A 1 71N
Sl Rl O/R GPM ["i
Outdoor Reset enabled
® OO n 1-
N� NIA NIA'NIA
Outdoor Reset disabled
L I ISLI ISLVIN
Sl Rt O/R GPM psi
64 Operating the Boiler
This mode is used to configure the Outdoor Reset Control mode. Types of Heat Load
This mode is disabled by default from the factory.
OCAUTION
An outdoor sensor error may occur if the Outdoor Reset
Control mode is enabled without the outdoor sensor installed
In the Outdoor Reset Control mode, the boiler's water
temperature is regulated according to the outdoor
temperature. The Outdoor Reset Control operation
ensures that the system provides optimal space
heating. It helps limit the cost for space heating
by preventing unnecessary fuel consumption and
minimizes air pollution.
Settina the Heat Load for the Outdoor Reset Control Mode
Display
Description
7,
Outdoor Reset heat load types
1: Finned tube baseboard
®❑� ®
2:FAN coil
h0 IA PI/I NI_
3: Cast iron baseboard
I� GIN ,I7IN
4: Low mass radiant
S4 Rt OR GPM Psi
5: High mass radiant
6: Radiator
7: Custom
h I INI M101,17101
Outdoor Reset heat load not
V � &NIA IN.UIN
St Rt O/R GPM psi
selected
This mode is used to configure the heat load type to be used with
the Outdoor Reset Control mode.
A preset or user -defined temperature range is selected
automatically based on the heat load type selected.
Heat Load
Supply Set-
Return Set-
Remarks
point Range
point Range
1.Finned Tube
120-180°F
101-147°F
Default
Baseboard
(48.5-82°C)
(38-63.5°C)
2. Fan Coil
140-180°F
116-147°F
(60-82°C)
(46.5-63.5°C)
3. Cast Iron
100-170°F
86-139°F
Baseboard
(37.5-76.5°C)
(30-59°C)
4. Low Mass
80-1407
70-116°F
Radiant
(26.5-60°C)
(21-46.5°C)
5. High Mass
80-120°F
70-101°F
Radiant
(26.5-48.5°C)
(21-38°C)
6. Radiators
120-170°F
101-139°F
(48.5-76.5°C)
(38-59°C)
Supply Control:
Return Control:
7. Custom
Absolute MIN/
Absolute MIN/
User-
defined
MAX Set -point
MAX Set -point
Heat loads 1-6 show the preset temperature ranges based on
the load type selected, while heat load 7 provides a custom
temperature range. When the custom temperature range is in use,
the boiler operates based on the user -defined "Absolute Min"and
"Absolute Max" temperature settings.
Setting the Lowest Outdoor Temperature
Display
Description
® O W III
NA I IR IT, 10
W117IN,fh,Vlk
St Rt aR GPM psi
Lowest outdoor temperature (°F)
® O Wm
NA NIA NhI NIA
Lowest outdoor temperature not
ihl hIN.hIN,VIN
St RT OR GPM
in use
This mode is used to configure the lowest outdoor temperature.
The boiler will operate at the high end of the supply or return set -
point range at this outdoor temperature.
Operating the Boiler 65
Outdoor Low Temperature Setting Range Setting the Boost Interval Time
Range
Remarks
-4°F (-20°C) — [Outdoor High
Temperature Set -point - 9°F
Default:14°F (-10°C)
(5°C)l
Setting the Highest Outdoor Temperature
Display
irDescription
II
® OO ® FA
NIA me w
V i IM.hh,X
Sl Rt OR GPM psi
Highest outdoor temperature(°F)
® ❑,% ® z
h NIA NI/1, NIA
Highest outdoor temperature not
V I IN,VN,VIN
$1 Rt OIR GPM psi
in use
This mode is used to configure the highest outdoor temperature.
The boiler will operate at the low end of the supply or return set -
point range at this outdoor temperature.
Outdoor High Temperature Setting Range
Range Remarks
[Outdoor Low Temperature
Set -point +9°F (5°C)] — 104oF Default: 70oF (21PC)
(40°C)
Display
Description
®0❑� m
NA Old NU, *
AEI ITLYIN , X
Si Rt OIR GPM psi
Boost interval time (min)
The boost interval time may be set to prevent interruption in
space heating while using the Outdoor Reset Control mode,
due to changes in heat load conditions. With the boost interval
time enabled, the boiler increases the space heating supply
temperature by 9°F (5°C) and the return temperature by 57 (3°C)
after a set time elapses.
Boost Interval Time and Temperature Setting
Setting
Range
Remarks
Boost Interval
OFF (0),1-120 min
Default:
Time
OFF (0)
Space Heating Supply (Fixed
Boost
Value): 9°F (5°C)
Temperature
Space Heating Return (Fixed
Value): 5°F (3°C)
Setting the Max Heat Capacity for Space Heating
Display
Description
®OFAIin
WI NI_ Ne' Nt
ASI VN , * , ih
$a Rt OIR GPM psi
Space heating max heat capacity (%)
This menu is used to configure the desired space heating capacity.
When the boiler operates in the Normal mode, the space heating
capacity is limited to the set value (%).
• Default:100%
• Setting Range: 50-100%
66 Operating the Boiler
Setting the Pump Freeze Protection Temperature
Display
Description
NI/l sio N/l sil
Pump freeze protection temperature
As I7N ,UN , 71s
S+ Rt OR GPM psi
(°F)
This menu is used to configure the circulation pump freeze
protection temperature.
When the space heating supply temperature stays below the set
value for longer than 10 seconds, the boiler runs the circulation
pump to prevent freeze damage (the pump runs for 10 minutes,
then stops for 1 minute).
• Default: 50°F (10°C)
• Setting Range:43-507 (6-10°C)
Setting the Anti -fast Cycling Time
Display
Description
E 01 m
Ne IMP Nhl INe
S+ Rt OR GPM psi
Anti -fast cycling time (min)
The anti -fast cycling time is the duration that the boiler stops
its space heating operation when the space heating supply or
return temperatures reach the set values for boiler operation stop
temperatures. The boiler will not resume space heating until the
duration elapses, even when the space heating supply or return
temperatures return to within the set ranges.
• Default: 3 minutes
• Setting Range: 0-20 minutes
Setting the Pump Overrun Time
Display
Description
®01161in
N ll NIA NI , Nil
17 �I & .VIN , 7N
U Rt OR GPM psi
Pump overrun time (min)
The pump overrun time is the duration that the circulation
pump will continue to run when the space heating supply or
return temperatures reach the set values for boiler operation
stop temperatures and the burner turns off. If the space heating
supply or return temperature remains out of the boiler operation
temperature range after the set time, the boiler stops the pump for
10 minutes, runs it again for 5 minutes, and then repeats the cycle.
• Default:40 minutes
• Setting Range: 3-40 minutes
Setting the DHW Max Heat Capacity
Display
Description
®01461in
IN—P NI_ Nil Nil
DHW max heat capacity (%)
St Rt O/R GPM psi
This menu is used to configure the desired DHW capacity. When
the boiler operates in the Normal mode, the DHW capacity is
limited to the set value (%).
• Default:100%
• Setting Range: 50-100%
Setting the DHW Wait Time
Display
Description
Ni 10111 Old'N/l
DHW wait time (min)
6 FOSIBN.VN
Sl Rt OR GPM psi
The DHW wait time is the duration that the boiler maintains the
DHW supply mode after a DHW demand. With the DHW wait time
enabled, a faster DHW supply may be available when there is a
subsequent DHW demand. The boiler switches the 3-way valve to
space heating mode when the set time elapses.
• Default: 5 minutes
• Setting Range: 0-20 minutes
Operating the Boiler 67
When a call for space heating occurs simultaneously
with a DHW demand, the 3-way valve will
immediately switch to space heating mode at the end
of the DHW demand.
Setting the Burner -Off Temperature
Description
NI NIA NISI NI
AN iIN.BRIJ&
Sl Rt O/R GPM psi
Burner -off temperature (°F)
During space heating, the boiler turns off the burner when the
space heating supply temperature meets or exceeds the burner -off
temperature.
Burner -Off Temperature Range
Range Remarks
0-547 (0-30°C) Default: 4°F (2°C)
Setting the Burner -On Temperature
Description
I- NIA Nlll NA
ih GhI,IiN ,VH
S+ Rt OR GPM psi
Burner -on temperature (°F)
During space heating, the boiler turns on the burner when
the space heating supply temperature is below the burner -on
temperature.
Burner -On Temperature Range
Range
5-54°F (3-30°C) Default: 57 (3°C)
Setting the Supply Absolute MAX Temperature
Display
Description
®O❑� m
7
II NIl_ A� "II *
it , , iN
Sa Rt OR GPM psi
Supply absolute MAX set point (°F)
This menu may be used to make changes to the maximum supply
temperature range when the Supply Control mode is in use. When
configuring the Custom mode in the Outdoor Reset Control mode
the supply temperature changes based on the supply absolute
MAX temperature range.
Supply Absolute MAX Temperature Range
Range
Remarks
[MIN Set -point + 36°F (20°C)] — 194°F (90°C)
Default: 180°F
(82°C)
Setting the Supply Absolute MIN Temperature
Display
Description
®OIJAIm
NIA NI_ w, 11
Sa Rt OR GPM psi
Supply absolute Min set point (°F)
This menu may be used to make changes to the minimum supply
temperature range when the Supply Control mode is in use. When
configuring the Custom mode in the Outdoor Reset Control mode,
the supply temperature changes based on the supply absolute
MIN temperature range.
Supply Absolute MIN Temperature Range
Range
Remarks
77°F (25°C) — [MAX Set -point - 36°F (20°C)]
Default: 104°F
(40°C)
68 Operating the Boiler
Setting the Return Absolute MAX Temperature
Display
Description
®0 ] z
w NI_ 9' iiII
I I I"K .I IN .lyh
St Rt O/R GPM psi
Return absolute MAX set point (°F)
This menu may be used to make changes to the maximum return
temperature range when the Return Control mode is in use. When
configuring the Custom mode in the Outdoor Reset Control mode,
the return temperature changes based on the return absolute MAX
temperature range.
Return Absolute MAX Temperature Range
Range
Remarks
[MIN Set -point+ 18°F (10°C)] - 158°F (70°C)
Default: 149°F
(65°C)
Setting the Return Absolute MIN Temperature
Display
ME Description
y/ sio sI Return absolute MIN set point (°F)
A- r6s ols , As
S+ Rt O/R GPM psi
This menu may be used to make changes to the minimum return
temperature range when the Return Control mode is in use. When
configuring the Custom mode in the Outdoor Reset Control mode,
the return temperature changes based on the return absolute MIN
temperature range.
Return Absolute MIN Temperature Range
Range
Remarks
68°F (20°C) - [MAX Set -point -18°F (10°C)]
Default: 86°F
(30°C)
Setting the Automatic Make-up Water Feeder Pressure
Display
Description
®0FAI A
NI Nl/l 6—i"hl/
II MN AWN . AEI
U Rt OR GPM
AWS pressure operation
This menu may be used to allow the boiler to maintain the space
heating system water pressure to ensure that a sufficient amount
of water is in the system. When the system pressure falls 4 PSI
below the set value, the boiler opens the makeup water feeding
valve for a maximum of 2 minutes until the system is filled and
water pressure exceeds the set value. After filling the system,
the boiler runs the circulation pump for 15 seconds in the space
heating mode before completing the process. The makeup water
feeding valve operates only when there is no space heating or
DHW demand.
• Default:12 PSI
• Setting Range:12-30 PSI
Setting the Initial Start-up Number
Display
Description
® 0 Oe m
I_Id h1/1 hII fhl/
III r .IIISI.VN
Sa Rt OIR GPM psl
Initial start-up number
This menu may be used to set the number of water heaters initially
activated during DHW stand-by periods.
• Default: 0 (Auto setting: Total Installation Number/
2, Max value 3)
• Setting Range: 0-16
Operating the Boiler 69
Settinq the Cascade Protocol
• Default: NPE
Display
Description
®O® 2II
INIII II SV NA
All the slave units are NPE water
i N 7I , �N , AN
Sa Rt OR GPM psi
heaters.
® ❑� ® III
Slave units consist of NR/NP water
A NIA h� W
1231 IA0 1. tu
heaters, or a combination of NPE and
,
NR/NP water heaters.
Sa Rt OR GPM Psi
This menu may be used to set the communication protocol for the
cascade system. Set the parameter values according to the type of
slave units installed in the cascade system.
Settina the Zone Controller Communication
Display
Descripti
®O n 111
N� NIA IH�I I�
SmartZone/Ready-link connection is
iN hhl. AN, it
enabled (On)
Sa Rt OR GPM Psi
® ❑'� ® III
N_I INI7Niel' Niel
T/T zone controller connection is
eN AN , MI. AN
S1 Rt O/R GPM psi
disabled (Off)
Setting the Minimum Heat Capacityfor DHW
Display
Description
®0❑� m
N! N_V PI_� NO
-I ERAS
Si Rt OIR GPM psi
DHW minimum heat capacity (%)
This menu is used to configure the desired DHW capacity. When
the boiler operates in Normal mode, the DHW capacity is limited to
the set value (%).
• Default: Minimum DHW heat capacity of the unit (%)
• Setting range: Minimum DHW heat capacity-40%
Setting the Navi-Link Connection
Display
Description
®00 Z
I_I I NIA NIAI I/
CI IiN . AN . 7I
Sa RT OR GPM psi
Navi-Link connection is enabled(On)
®O ❑e m
III Nl/l Nll N/l
Navi-Link connection is disabled
11I IIN ,1 NA
St RT O/R GPM PSI
(Off)
This menu may be used to control and monitor the boiler using a
Wi-Fi network via Navi-Link connection.
• Default: Off
This menu may be used to allow the boiler to work with a Navien
SmartZone+ controller connected via a Ready -Link cable. Resetting All Parameters
• Default:Off
Setting the Minimum Heat Capacity for Space Heating
Display
Description
® ❑'� ® III
I NIA NI N�
Space heating minimum heat
_N
J hhl.lih, iN
capacity (%)
Sa Rt O/R GPM psi
This menu is used to configure the desired space heating capacity.
When the boiler operates in Normal mode, the space heating
capacity is limited to the set value (%).
• Default: Minimum space heating capacity of the unit (%)
• Setting range: Minimum space heating capacity-40%
Display
Description
ROFA m
671 NIA I/NIA
LoNlihl.7I ,IIN
Sa RT OIR GPM psi
Do not reset parameters (No)
®o❑c m
A I II I Niel NA
V N IJ. AN.VN
S1 Rt OIR GPM psi
Reset all parameters (Yes)
70 Operating the Boiler
This menu may be used to reset all the parameters to their factory
default settings.
To reset all parameters:
1. Press the [+] or [-] buttons to change the display to [Yes].
2. Press the [Mode] button.
3. When [No] appears on the display again, all parameters have
been reset.
Settina a New Password
Display I I Description
®OOn
N� I Iel �bl Change password
LI gN.Vh . AN
This menu may be used to set a new password to access the
parameter setting menu.
To set a new password:
1. Move to [*.PSC] and press the [Mode] button. The current
password is displayed, with the first digit flashing.
2. Press the [+] or [-] buttons to change numbers.
3. Press the [Diagnostic] button to change places.
4. When you are done setting the password, press the [Mode]
button to save it. The new password is displayed on the front
panel for 3 seconds, before the boiler returns to the parameter
setting mode.
If you do not press the [Mode] button in 10 seconds
after setting a new password, the new password is
automatically saved and [*.PSC] is displayed on the
front panel.
11.6 Resetting the Boiler
If an error message appears, you can try resetting the boiler to
resolve the problem. To reset the boiler, press the Reset button.
If resetting the boiler does not solve the problem, refer to the
Troubleshooting section of this manual or contact Technical
Support at 1-800-519-8794.
Operating the Boiler 71
12. Appendixes
12.1 Gas Conversion
This boiler is configured for Natural Gas from the factory. If
conversion to Propane Gas is required, the conversion kit supplied
with the boiler must be used.
A DANGER
Do not perform a gas conversion without an officially approved
conversion kit and the instructions supplied by Navien. Gas
conversion using any other parts will result in extremely
dangerous burner operation, leading to fire, explosion, severe
personal injury or death.
Q WARNING
This conversion kit shall be installed by a qualified service
agency* in accordance with Navien's instructions and all
applicable codes and requirements of the authority having
jurisdiction. The information in these instructions must be
followed to minimize the risk of fire or explosion orto prevent
property damage, personal injury or death. The qualified
service agency is responsible for the proper installation of
this kit.The installation is not proper and complete until the
operation of the converted appliance is checked as specified
in the manufacturer's instructions supplied with the kit.
• Turn off electrical supply to the boiler and close the manual
gas shut-off valve to isolate the boiler during conversion.
Allow the boiler to cool if it has been operating.
• For propane boilers: The propane supplier mixes an odorant
with the propane to make its presence detectable. In some
instances the odorant can fade, and the gas may no longer
have an odor. Before startup (and periodically thereafter),
have the propane supplier verify the correct odorant level
in the gas.
* A qualified service agency is any individual, firm, corporation or company
which either in person or through a representative is engaged in and
is responsible for the connection, utilization, repair or servicing of gas
utilization equipment or accessories; who is experienced in such work,
familiar with all precautions required, and has complied with all of the
requirements of the authority having jurisdiction.
In Canada:The conversion shall be carried out in accordance with
the requirements of the provincial authorities having jurisdiction
and in accordance with the requirements of the CAN-13149.1 and
CAN1-6149.2Installation Code.
Tools Required:
• Phillips Screwdriver
• Flathead Screwdriver
• s/sz in or 4mm Allen Wrench
• Combustion Analyzer or Dual Port Manometer
• Gas Leak Detector
Included Items:
• Gas Orifice (refer to below table)
Model
NG
LP
1STAGE
2STAGE
1STAGE
2STAGE
NCB-150E
05.10
05.80
04.10
04.50
NCB-180E
04.80
05.95
03.80
04.70
NCB-210E
06.10
06.30
04.50
04.80
NCB-240E
06.10
06.30
04.50
04.80
Table 1. Orifice Size
• Gas Pressure and Conversion Kit Number Labels
Procedure:
1. Turnoff both gas and water supply to the boiler.
2. Unclasp the 3 buckles that fix the cover to the boiler, and then
remove the cover by lifting it and pulling it outward. See Figure
1 for illustration of the front cover on the unit.
Figure 1. NCB-E Series Front cover
72 Appendixes
3. Once the front cover is removed, place it in a safe location to
prevent accidental damage.
4. Label all the wires on the PCB.
5. Disconnect all the wires.
6. Loosen the three screws indicated in the figure.
7. Remove the PCB assembly.
8. With the internal components exposed, locate the gas inlet
pipe and the gas valve in the middle of the unit, as shown in
Figure 2.
Gas Inlet
Pipe
Gas Valve
Figure 2. NCB-E Series Internal Components
9. Use a Phillips screwdriver to remove the two screws at location
A -the connection below the gas valve where it connects
to the pipe. See Figure 3 for reference. Once the screws are
removed, carefully separate the pipe from the gas valve.
10. Once the gas inlet pipe is detached from the gas valve, find
location B - the connection above the gas valve where it is
attached to the fan motor assembly. Carefully remove the four
screws by hand using a Phillips screwdriver and pull the gas
valve away from the fan assembly to access the gas orifice.
Location B: Remove
4 screws here
Location A: Remove
2 screws here I =
Figure 3. Detaching Gas Valve from
Gas Inlet Pipe and Fan Motor Assembly
Appendixes 73
11. Once the Gas Orifice is exposed, remove the two screws that
hold the part in place. Remove the Gas Orifice from its housing
and prepare the new Gas Orifice for the LP conversion for
installation.
Remove two
2 screws here
Figure 4. Access to Gas Orifice in Fan Assembly
QWARNING
• DO NOT adjust or attempt to measure gas valve outlet
pressure. The gas valve is factory -set for the correct outlet
pressure. This setting is suitable for natural gas and propane,
requiring no field adjustment.
• Attempting to alter or measure the gas valve outlet pressure
could result in damage to the valve, causing potential severe
personal injury, death or substantial property damage.
Navien NCB-E boilers are shipped ready to fire natural gas
ONLY.
Figure 5. Exploded View of Gas Pipe Assembly
A DANGER
See Figure 5. Inspect the 0-ring between the gas valve and
gas valve inlet adapter whenever they are disassembled.
The 0-ring must be in good condition and must be installed.
Failure to comply will cause a gas leak, resulting in severe
personal injury or death.
74 Appendixes
O O
O O O C
o O
240LP 240NG
Figure 6.Orifice Identification
12. Remove the Gas Orifice, ensure that the packing is properly
seated inside the port, and then install the new Gas Orifice for
use with LP gas. Ensure that the Orifice is properly seated on
the packing inside the port before proceeding to the next step.
13. Replace the gas inlet pipe to its original position and use all
screws to secure all connections.
Do not overtighten as this may damage or crack
the components.
A DANGER
Inspect the 0-ring between the gas valve and gas valve inlet
adapter whenever they are disassembled. The 0-ring must be
in good condition and must be installed. Failure to comply will
cause a gas leak, resulting in severe personal injury or death.
14. Place the PCB assembly back on to the boiler and tighten the
three screws.
15. Check the labels carefully and then connect all the wires.
16. Set the front panel DIP Switch to change the gas type. For LP,
set DIP Switch 2 #2 to On. For NG, set DIP SW2 #2 to Off.
Q WARNING
Ensure that you have turned off the power to the boiler before
accessing the DIP switches.
ON ON
..MINI.... 11
1 2 3 4 5 6 7 8 9 10 1 2
NG LP
M
ON 2
A DANGER
• When conversion is required, be sure to set the front panel
DIP switches according to the supply gas type.
• Failure to properly set the DIP switches could cause carbon
monoxide poisoning, resulting in severe personal injury or
death.
17. Turn on the gas and water supply to the boiler.
Appendixes 75
18. Measure and adjust the gas/air ratio.
Option 1. Using Combustion Analyzer (recommended)
a. Loosen the screw, rotate the plate and remove the gasket
to access the emissions monitoring port as shown in
Figure 7.
b. Insert the analyzer into the port (Figure 7).
Figure 7. Insert the Analyzer
Mode
Fuel
High fire
Low fire
%CO2
%CO2
NCB-150E
NG
8.9
9.5
LP
10.2
10.8
NCB-180E
NG
8.9
9.5
LP
10.2
10.8
NCB-210E
NG
8.9
9.5
LP
10.2
10.8
NCB-240E
NG
8.9
9.5
LP
10.2
10.8
Table 2. CO2 value
(CO2 values must be within 0.5% of the values listed.)
c. Fully open several hot water fixtures and set the boiler to
operate at 1-stage MIN mode.
For operation mode selection, refer to
"Setting the Operation Mode" on page 63.
Measure the CO2 value at low fire.
If the CO2 value is not within 0.5% of the value listed in
Table 2, the gas valve set screw will need to be adjusted.
If adjustment is necessary, locate the set screw as shown
in Figure 8. Using a V32 in or 4 mm Allen wrench, turn
the set screw no more than turn clockwise to raise or
counterclockwise to lower the CO2 value.
Figure 8. Set Screw Location
The set screw is located behind the screw -on
cover. This must be removed first.
d. Fully open several hot water fixtures and set the boiler
to operate at 2-stage D. MAX mode (refer to "Setting the
Operation Mode"on page 63). Measure the CO2 value at
high fire.
If the CO2 values do not match Table 2 at high fire, do not
adjust the gas valve. Check for the proper Gas Orifice.
A DANGER
Improper gas valve settings can cause severe personal injury,
death or substantial property damage.
76 Appendixes
Option 2. Using Digital Manometer
a. Open the offset pressure port by loosening the screw two
turns as shown in Figure 9.
Figure 9. Connect Digital Pressure Monometer
b. Connect a manometer to the offset pressure port. For dual
port manometers, use the positive pressure side.
Model
Kit Part No.
Gas Type
IL
Offset
NCB-150E
NAC-N5
NG
-0.04 in ±0.01 in
NAC-L5
LP
-0.03 in ±0.01 in
NCB-180E
NAC-400
NG
-0.04 in ±0.01 in
NAC-04
LP
-0.03 in ±0.01 in
NCB-210E
NAC-500
NAC-05
NG
-0.04 in ±0.01 in
LP
-0.02 in ±0.01 in
NCB-240E
NAC-600
NG
-0.04 in ±0.01 in
NAC-06
LP
-0.02 in ±0.01 in
Table 3.Offset value for low fire
c. Fully open a hot water fixture and set the boiler to operate
at 1-stage MIN mode (refer to table 2). Measure the offset
value at low fire and compare it to the values in Table 3. If
the offset value is out of range, the gas valve set screw will
need to be adjusted.
If adjustment is necessary, locate the set screw as shown
in Figure 10. Using a s/32 in or 4mm Allen wrench, turn
the set screw no more than turn clockwise to raise or
counterclockwise to lower the offset value.
Figure 10. Set Screw Location
The set screw is located behind the screw -on
cover.This must be removed first.
d. At high fire, do not check the offset value and never adjust
the gas valve.
A DANGER
Improper gas valve settings can cause severe personal injury,
death or substantial property damage.
19. Once the CO2 or offset values have been confirmed, apply the
included conversion stickers to show that the appliance has
been converted to propane gas. Place these labels adjacent to
the rating plate as shown in Figure 11.
This unit bas been
rfed to Propane fuel
GfappareilPeMmnwrNau Ropane
Orifice Size/ Injecteur:
Min.4.5 mm to Max.48 mm
Inlet Gas Pressure I Pression d'enfrde du 9
Mn c.- Max.13.01nches
anifoid GasPressure I
Pressiofd la tubulure d'alimenfation:
Min.-0.02 to Max.-D inches WC
ax.
BTU lnputlD9,odfigoe:
M180, W 0 - M i n.19,900 BTUh
Comers Kk No.: NK-02
This boiler was converted on
to gas
with Kit No.
by
(name and address of organization making
this conversion, who accepts responsibility
for the correctness of this conversion)
Figure 11. Proper Placement of Gas Conversion Labels
Appendixes 77
V
00
D
Cn
X
rD
B BBB
CN13
Inletl Thermistor B B
B R
Ou[let2 Thermistor B B
BB
Inletl Thermistor
B B
A
O
B�B
Oudetl Thermistor B B
B
Ba-R
Exhaust Thermistor B
BK
High Limit I
BK
CN11
Optional
Outdoor Thermostat
CN5
DHW Flow Sensor W
® R
BK
CN22
WPS
Water Pressure R
Sensor BK
O
CN6
APS
Air Pressure Sensor
R
W
�
O
BK
Color Code
B : Blue
O :Orange
R :Red
W :White
Y :Yellow
BK : Black
BR : Brown
GY :Green/Yellow
P :Purple
If any of the original wires as
supplied the boiler must be
replaced, they must be replaced
their equivalent.
Front Panel
BK BKBK BKBK BKBK BKBKBKBK BK
CON1 CN21
O
0 M
O O
CN15
CN23 CN10 CN24 CN25 CN16
%/-%nnnnnnn [r1 [rwq F.
T,, i ILWCO: lExtema AC OutputAl
L__ L__ 1—I_______
WY BRWB
n
Cn
Main Gas Valve Dual Venturi
N
Auto Feeder
(Make-up Water)
O
02�==ED
CN18
FM
Fan Motor
Pump
Flame rod
B
K
O
B
IG B
Spark
CN17
Electrode
GY
GY411 Ground
GY Power Code
Ground (GY)
Fuse (SA)
d� BK Neutra3BK
Hot
OW
OJ
I
CN1
CN14
CN26
(Oj Optional
External Power Wire—j§(1.SA, 180W)
Solenoid
Valve
BE/
R
B
3-Way Valve
12.3 Ladder Diagram
HOT NEUTRAL
PHmar
Secondar
M OUTPUT
Appendixes 79
12.4 Component Assembly Diagrams and Parts Lists
12.4.1 Case Assembly
80 Appendixes
#
Description dd
Part
Remark
1
Intake Air Duct Assembly
30008662B
2
Exhaust Pipe Assembly
30008673A
3
Case
20033278D
4
Intake Air Filter
30016248B
5
Air Pressure Sensor
30015811 A
6
PCB
30012262B
7
Front Panel
30012269B
8
Cover
30017069B
Appendixes 81
12.4.2 Burner Assembly
12
of
N
82 Appendixes
#
Description
Part
Remark
1
Damper
30008825A
2
0-Ring (G50)
20003019A
3
Fan Bracket
20022095A
4
Siphon
30015905A
5
Mixer Chamber
20030283A
NCB-150E
20022750B
NCB-180E
20022751C
NCB-210E/240E
6
Ignition Transformer
30010455A
7
Burner Packing
Heat Exchanger Ass'y
20027105A
NCB-150E
20021677A
NCB-180E
20021672A
30014697A
NCB-210E/240E
NCB-150E
8
20022750B
NCB-180E
20022751C
NCB-210E
30012317A
NCB-240E
9
Thermistor (Exhaust)
30009478A
10
Thermistor (Water)
30008366A
11
High Limit Switch
30002558A
12
Fastener
20007859A
13
0-Ring(018.8x2.4t)
20003022A
14
Heat Exchanger Outlet Pipe
30014733A
NCB-150E
30011913A
NCB-180E
30011912A
NCB-210E/240E
15
Packing (Circulation Pump)
20027617A
16
LWCO (Pressure Sensor)
20007924A
17
Siphon Hose
20027671A
18
Return Pipe
30014319A
NCB-150E
30015659A
NCB-180E
30015660A
NCB-210E/240E
19
Siphon Fastener
20007833A
20
LWCO Packing
20006873A
21
Ignitor
30012226A
NCB-180E/210E/240E
30014183A
NCB-150E
Appendixes 83
12.4.3 Waterway Assembly
33
II,�� lll:� 32 36
21
#
Description
Part #
Remark
1
DHW Heat Exchanger
30015621A
NCB-150E
30008181 A
NCB-180E
30005017A
NCB-210E/240E
2
Fastener
20007858A
3
0-Ring (P 18)
20006954A
4
DHW Outlet Elbow
30012328A
5
Packing
20006852A
6
Thermistor
30008366A
7
DHW Outlet Adaptor
30003747A
84 Appendixes
Description
Part #
Remark
8
DHW Flow Sensor
30012033B
9
0-Ring (P14)
20006952A
10
DHW Cold Water Adaptor
30015582A
NCB-150E
30010315A
NCB-180E
30010316A
NCB-210E
30010317A
NCB-240E
11
0-Ring (P20)
20017212A
12
DHW Cold Water Filter
30007878A
13
Vent Pipe
30015866A
NCB-150E
30015943A
NCB-180E
30014737A
NCB-210E/240E
14
Auto Fill Valve
30012241A
15
0-Ring (P16)
20017210A
16
Fastener
20007859A
17
Auto Fill Valve Adaptor
-
18
3-Way Outlet Adaptor B
30012332A
19
Fastener
20017726A
20
3-Way Outlet Adaptor A
30012331 A
21
Packing
20011380A
22
Connection Adaptor
20007959A
23
3-Way Valve
30004831C
24
Fastener
20007733E
25
Water Fill Pipe
30012247A
26
Drain Cock
30008630C
27
Space Heating Supply Pipe
20033691 A
28
Space Heating Supply Adaptor B
30012330A
29
Space Heating Return Adapter A
30012329A
30
Space Heating Strainer
30015446A
31
3-Way Outlet Pipe
30011906A
32
Circulation Pump Fastener
20034532A
33
Circulation Pump
30015307A
34
0-Ring (021.70.5t)
20033699A
35
O-Ring ((D18.8x2.6t)
20003022A
36
Space Heating Return Adapter B
30012330A
37
SH Supply Pipe
30014736A
38
Vent Adaptor
30016131A
Appendixes 85
12.4.4 Fan (Gas) Assembly
86 Appendixes
#
Description
Part
Remark
1
Fan Assembly
30008834A
NCB-150E/180E/210E/240E
2
Fan Packing
20022744A
3
0-Ring (G75)
20018079A
4
Dual Venturi
30017402A
NCB-150E/180E/210E/240E
5
Silence
20030064A
NCB-150E
20032568A
NCB-180E
20032570A
NCB-210E/240E
6
Silence Adaptor
20033736A
NCB-150E
20032567A
NCB-180E
20032569A
NCB-210E/240E
7
Venturi Packing
Gas Orifice
20022660A
8
20033737A
NCB-150E
20024159A
NCB-180E (NG)
20019144E
NCB-210E/240E (NG)
20034176A
NCB-150E (LP)
20024190A
NCB-180E (LP)
20024189B
NCB-210E/240E (LP)
9
0-Ring (P34)
20019090A
10
Gas Adapter
30009921A
NCB-180E
30009922B
NCB-210E/240E
11
0-Ring (P20)
20006934A
12
Gas Pipe
30014321A
NCB-150E
30012056A
NCB-180E
30012058A
NCB-210E/240E
13
Gas Connector
20027149A
14
Gas Valve
30011586A
NCB-180E
30008429A
NCB-150E/210E/240E
15
Gas Inlet Adaptor
20027748A
Appendixes 87
12.5 Outdoor Temperature Sensor
Outdoor Temperature Sensor Installation
1. Pull out the sensor body from the cap.
2. Attach the body to the wall using the screws/anchors provided
with the device.
3. Run the wires into the device body through the grommet
opening.
4. Connect the wires to the terminal block.
5. Attach the cap to the body.
Navien Outdoor Temperature Sensor Kit
Outdoor Temperature Sensor Installation Guidelines
• Avoid areas with temperature fluctuations by direct sunlight,
and where the temperature may not be representative of true
outdoor temperature.
• Best location to install the temperature sensor is on a North or
Northeast side of a structure under eaves where the sensor is
shielded from direct sunlight.
• Avoid placing sensor in close proximity of heat sources that may
affect correct temperature sensing. (fans, exhausts, vents, lights)
• Avoid installing the sensor in areas where the sensor is subjected
to excessive moisture.
• Use 18 gauge wiring (thermostat wiring) with no splices. (except
at the unit harness connection with yellow leader wire.)
• Caution should be taken to avoid potential electromagnetic
interference (EMI) by routing separately from potential sources
such as line voltage wiring. When necessary, shielded cable may
be used.
• Make sure wiring connections are secure before closing the cap.
• The sensor is a water resistant device.
• Any damage to the device may require the replacement of the
entire component.
12.6 Outdoor Reset Control (Available with
Optional Outdoor Temperature Sensor)
The Outdoor Reset Control feature may be used to enhance energy
efficiency while maintaining optimal heating performance. With
the Outdoor Reset Control, the space heating temperature setting
automatically changes according to the outdoor temperature and
the current space heating system application (system load).
You can configure the Outdoor Reset Control settings on the front
panel by entering the Special Parameter Setting mode. Refer to
"11.5 Setting the Parameters"on page 64.
The Outdoor Reset Control feature requires
installation of an outdoor temperature sensor, and it
only works when the boiler is running in the normal
operation mode. It does not work when the boiler is
running in either the Minimum (MIN) or Maximum
(MAX) mode, or when the boiler's front panel displays
a fault.
Outdoor Outdoor
High MIN Low MIN
1 1 `F "C
AbsoluteMAX... j_______________________J- --194 90
1 1
185 85
I I
176 80
1 167 75 f High Mass Radiant
I � I 158 70
Low Mass Radiant
149 65
1 � ,• 1
!•.• J 140 60 + Cast Iron Baseboard
131 55
•'•� 1 122 50 Custom
113 45 ..... Radiator
1 1
! 1 104 40
— — — Finned Tube Baseboard
95 35
86 30 — Fan Coil
Absolute___ I_______________________F__ 77 25
MIN 1 1
1 68 20
I I
I I 59 ,5
1 1
1 50 ,0
T 113 104 95 86 77 68 59 50 41 32 23 14 5 -4 -13
.0 45 40 35 30 25 20 15 10 5 0 -5 -10 -15 -20 -25
Space Heating Temperature Setting for the
Outdoor Reset Control Feature
The following tables list the default space heating temperature
range by system heat load and the applicable outdoor
temperature ranges.
88 Appendixes
Outdoor Temperature Sensor Installation Guidelines
Heat Load
Supply Set -point
Return Set -point
Range
Range
Finned Tube
120-1807
101-147°F
Baseboard (default)
(48.5-82°C)
(38-63.5°C)
Fan Coil
140-180°F
116-147°F
(60-82°C)
(46.5-63.5°C)
Cast Iron Baseboard
100-170°F
86-139°F (30-59°C)
(37.5-76.5°C)
Low Mass Radiant
80-1407
70-116°F
(26.5-60°C)
(21-46.5°C)
High Mass Radiant
80-120°F
70-101°F (21-38°C)
(26.5-48.5°C)
Radiators
120-170°F
101-139°F
(48.5-76.5°C)
(38-59°C)
Supply Control
Return Control
Custom
(Absolute MIN/
(Absolute MIN/
MAX set point)
MAX set point)
Outdoor Temperature Range and Default Temperature Settings
Set Point
Range
Remarks
Outdoor Low
-4 to 59°F
Default: 14°F
Temperature
(-20 to 15°C)
(-10°C)
Outdoor Low
Outdoor High
Temperature Set
Default: 70°F (21°C)
Temperature
Point +41°F (5°C)
to 104°F (40°C)
Appendixes 89
Memo
Installation &Operation Manual
NCB-E Condensing Combi-Boilers
Getting Service
If your boiler requires service, you have several options for getting service:
• Contact Technical Support at 1-800-519-8794 or on the website: www.navien.com.
• For warranty service, always contact Technical Support first.
• Contact the technician or professional who installed your boiler.
• Contact a licensed professional for the affected system (for example, a plumber or electrician).
When you contact Technical Support, please have the following information at
• Model number
• Serial number
• Date purchased
• Installation location and type
• Error code, if any appears on the front panel display
Version: 7.0 (Dec 06, 2019)
mNavierw
Navien, Inc.
800.519.8794 1 www.Navien.com
20 Goodyear Irvine, CA 92618