BLD2021-1178_Manufacturer_Specifications_and_Installation_Instructions_8.24.2021_1.18.20_PM_2373468Bosch BOwA Split Syste g eat Pump
Condensing Units Up to 18 SEER
2-3-4-5 Ton Capacity
R410A
:is
AMERUi CERTIFIED
i.a h i l tllr�•�lur Y•a�D
Unitary Small HP
AHRI Standard 21D240
2 1 Bosch IDS BOVA Installation Instructions
Data subject to change 11.2019 1 Bosch Thermotechnology Corp.
Installation Instructions Bosch IDS BOVA 13
Table of Contents
1 Key to symbols and safety instructions 4
1.1 Keytosymbols 4
1.2 Safety 4
2 Unit location considerations 6
2.1 Unitdimensions 6
2.2 Refrigerant piping limits 6
2.3 Location restrictions 7
3 Unit preparation 8
3.1 Prepare the unit for installation 8
4 Setting the unit 8
4.1 Pad installation 8
5 Refrigerant line considerations 9
5.1 Refrigerant line and service valve connection sizes 9
5.2 Required refrigerant line length 9
5.3 Refrigerant line insulation 9
5.4 Reuse existing refrigerant lines 9
6 Refrigerant line routing 10
6.1 Precautions 10
7 Refrigerant line brazing 11
7.1 Braze the refrigerant lines 11
8 Refrigerant line leak check 13
8.1 Check for leaks 13
9 Evacuation 13
9A Evacuate the refrigerant lines and indoor coil 13
10 Service valves 14
10.1 Open the service valves 14
11 Electrical -low voltage 15
11.1 Low Voltage Maximum Wire Length 15
11.2 Low voltage hook-up diagrams 15
12 Electrical - high voltage 16
12.1 High voltage power supply 16
12.2 High voltage disconnect switch 16
12.3 High voltage ground 16
13 Start up 17
13.1 System start up 17
14 System charge adjustment 18
14.1 Charging: weigh-in method 18
14.2 Subcooling charging and refrigerant adjustment in
cooling (above 55°F outdoor temp.) 18
15
System operation and troubleshooting
21
15.1
Control logic description
21
15.2
Sensors (thermistors/pressure transducer)
21
15.3
Defrost description
21
15.4
Compressor crankcase heater description
22
15.5
Reversing valve operation
22
15.6
Protection functions
22
15.7
Fault code table
23
15.8
Parameter point check table
24
15.9
Control board overviews
25
15.10 Error code troubleshooting
28
16 Wiring diagrams 38
16.1 For BOVA 36 38
16.2 For BOVA 60 39
17 Care and maintenance 40
17.1 Cleaning precautions 40
17.2 Changing your air filter 40
17.3 Maintenance - Long Periods of Non -Use 40
17.4 Maintenance - Pre -Season Inspection 40
Bosch Thermotechnology Corp. 111.2019 Data subject to change
41 Bosch IDS BOVA Installation Instructions
1 Key to symbols and safety instructions
1.1 Key to symbols
Warnings
Warnings in this document are identified by a
warning triangle printed against a grey background.
Keywords at the start of a warning indicate the type and seriousness
of the ensuing risk if measures to prevent the risk are not taken.
The following keywords are defined and can be used in this document:
► DANGER indicates a hazardous situation which, if not avoided, will result in
death or serious injury.
► WARNING indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
► CAUTION indicates a hazardous situation which, if not avoided, could result
in minor to moderate injury.
► NOTICE is used to address practices not related to personal injury.
1.2 Safety
Please read before proceeding
ACAUTION:
► This document is customer property and is to remain with
this unit. Please return to service information pack upon
completion of work.
► These instructions do not cover all variations in systems
or provide for every possible contingency to be met in
connection with the installation.
► Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchaser's purposes, the matter should be referred to your
installing dealer or local distributor.
The manufacturer recommends installing only approved
' matched indoor and outdoor systems. All of the manufacturer's split
systems are AHRI rated only with TXV indoor systems. Some of the
benefits of installing approved matched indoor and outdoor split systems
are maximum efficiency, optimum performance and the best overall
system reliability.
Important information
This document contains a wiring diagram and service information.
This symbol indicates important information where This is customer property and is to remain with this unit. Please return to
1 there is no risk to people or property. service information pack upon completion of work.
QCAUTION:
• ► This information is intended for use by individuals possessing
adequate backgrounds of electrical and mechanical
experience. Any attempt to repair a central air conditioning
product may result in personal injury and/or property
damage.
AWARNING: HAZARDOUS VOLTAGE
► Failure to follow this warning could result in property damage,
severe personal injury, or death.
► Disconnect all electric power, Including remote disconnects
before servicing. Follow proper lockout/tagout procedures to
ensure the power cannot be inadvertently energized.
Data subject to change 11.2019 1 Bosch Thermotechnology Corp.
Installation Instructions Basch IDS BOVA 15
AWARNING:REFRIGERANTOIL
► Any attempt to repair a central air conditioning product may
result in property damage, severe personal injury, or death.
These units use R-410A refrigerant which operates at 50 to
70% higher pressures than R-22. Use only R-410A approved
service equipment. Refrigerant cylinders are painted a "Rose"
color to indicate the type of refrigerant and may contain a
"dip" tube to allow for charging of liquid refrigerant into the
system. All R-410A systems with variable speed compressors
use a PVE oil (FV50S or equivalent) that readily absorbs
moisture from the atmosphere to limit this'hygroscopic"
action. The system should remain sealed whenever possible.
If a system has been open to the atmosphere for more than
4 hours, the compressor oil must be replaced. Never break a
vacuum with air and always change the driers when opening
the system for component replacement.
QWARNING:SERVICEVALVES
• ► Failure to follow this warning will result in abrupt release
of system charge and may result in personal injury and/
or property damage. Extreme caution should be exercised
when opening the Liquid Line Service valve. Turn valve stem
counterclockwise only until the stem contacts the rolled edge.
No torque is required.
QWARNING: BRAZING REQUIRED
• ► Failure to inspect lines or use proper service tools may result
in equipment damage or personal injury. if using existing
refrigerant lines make certain that all joints are brazed, not
soldered.
CAUTION: HOT SURFACE Q WARNING: HIGH CURRENT LEAKAGE
►
► Failure to follow this warning could result in property damage, May cause minor to severe burning. Failure to follow this severe personal injury, or death.
Caution could result in property damage or personal injury. Grounding is essential before connecting electrical supply.
Do not touch top of compressor.
CAUTION: CONTAINS REFRIGERANT
• ► Failure to follow proper procedures can result in personal
illness or injury or severe equipment damage.System
contains oil and refrigerant under high pressure. Recover
refrigerant to relieve pressure before opening system.
A
CAUTION: GROUNDING REQUIRED
► Failure to inspect or use proper service tools may result
in equipment damage or personal injury. Reconnect all
grounding devices. All parts of this product that are capable
of conducting electrical current are grounded. If grounding
wires, screws, straps, clips, nuts, or washers used to
complete a path to ground are removed for service, they must
be returned to their original position and properly fastened.
ACAUTION: INDOOR UNIT REQUIRED
► The indoor units must be matched with TXV. The model of TXV
can be changed according to the system capacity.
Bosch Thermotechnology Corp.111.2019 Data subject to change
6 1 Bosch IDS BOVA Installation Instructions
2 Unit location considerations ► Maximum line equivalent length = 100 feet.
2.1 Unit dimensions ► Maximum vertical equivalent length = 50 feet.
UnitDimensions ► Use only the line diameters indicated in Table 2,
Models H x W x L (Inches) ► If the suction line sets are greater than 50 feet do not use a larger suction
BOVA-36 24-15/16 x 29.1/8 x 29-1/8 line than recommended.
BOVA-60 33.3/16 x 29-1/8 x 29.1/8
Table 1
The unit's weight values is on the carton box.
When mounting the outdoor unit on a roof, be sure the roof will support the unit's
weight. Properly selected isolation is recommended to prevent sound or vibration
transmission to the building structure.
2.2 Refrigerant piping limits
2Ton
3/8" ` 3/4" Std.
5/8' Opt.
25
25
50
50
45
45
40
40
3Ton
3/8"3/4" Std.
25
50
50
50
5/8" Opt. 25 50 50
50
4Ton
3/8" 7/8" Std.
25
50
50
40
3/4' Opt. 25 50 50
40
5Ton
3/8" 7/8" Std.
25
50
50
40
3/4" Opt. 25 50 50
40
11/8"Opt. 25 40 N/A
N/A
Table 2
* Standard line size is recommended,
N/A: Application not recommended,
Refrigerant charge: refer to Sec. 14
Line Lengui
Data subject to change
11.20191 Bosch Thermotechnology Corp.
Installation Instructions Bosch IDS BOVA 17
2.3 Location restrictions
Ensure the top discharge area is unrestricted for at least 60 inches above the unit.
Do not locate outdoor unit near bedrooms since normal operational sounds may be
objectionable.
Position unit to allow adequate space for unobstructed airflow, wiring, refrigerant
lines, and serviceability.
Allow a minimum of 12 in. clearance on one side of access panel to a wall and a
minimum of 24 in. on the adjacent side of access panel.
Maintain a distance of 24 in. between units.
Position unit so water, snow, or ice from roof or overhang cannot fall directly on unit.
See Fig. 3 and Fig. 4.
Cold climate considerations (heat pump only)
aPrecautions must be taken for units being installed in areas where
snow accumulation and prolonged below -freezing temperatures occur.
► Units should be elevated 3-12 inches above the pad or rooftop, depending
on local weather. This additional height will allow drainage of snow and ice
melted during defrost cycle prior to its refreezing. Ensure that drain holes
in unit base pan are not obstructed, preventing drainage of defrost water
(Fig. 5).
► If possible, avoid locations that are likely to accumulate snow drifts. If not
possible, a snow drift barrier should be installed around the unit to prevent
a build-up of snow on the sides of the unit.
Corrosive Environment
Exposure to a corrosive environment may shorten the life of the equipment, corrode
metal parts, and/or negatively aff ect unit performance. Corrosive elements include,
but are not limited to: sodium chloride, sodium hydroxide, sodium sulfate, and other
compounds commonly found in ocean water, sulfur, chlorine, fl uorine, fertilizers,
and various chemical contaminants from industry/manufacturing plants. If installed
in areas which may exposed to corrosive environments, special attention should be
given to the equipment placement and maintenance.
► Lawn sprinklers/hoses/waste water should not spray directly on the unit
cabinet for prolonged periods of time.
► In coastal areas: locate the unit on the side of the building away from the
waterfront.
► Fencing or shrubbery may provide some shielding protection to the unit,
however minimum unit clearances must still be maintained.
► Approximately every three months, wash the outdoor coil and any exposed
cabinet surfaces.
Avoid Install
Near Bedrooms
Min. 60" Unrestricted
Min. 24"
Min. 12* to ---- Unrestricted —`I
shrubbery i�
t
.— Access Panel
IEEMIN
EEM
Figure 3
Z0'
a4 4
44
4
ddd
dd
od
Min. 12" to 4
Shrubbery
Min. 24" to i
® Shrubber
14
'�•� Access Panel
19 HIM
Figure 4
Min 12" —4 . ■
Snow ■
barrier
o mum
HEM Snow legs
Cl
3- 12" Elevation
o
L_'MOnpad
Figure 5
Bosch Thermotechnology Corp. 111.2019 Data subject to change
81 Bosch IDS BOVA - Insiallatidn Instructions
. z
3 Unit preparation
3.1 Prepare the unit for installation
► Check for damage and report promptly to the carrier any damage found to
the unit (Fig. 6).
► The charge port can be used to check to be sure the refrigerant charge has
been retained during shipment.
Figure 6
4 Setting the unit
4.1 Pad installation
When installing the unit on a support pad, such as a concrete slab, consider the
following:
► The pad must be at least 1-2" larger than the unit on all sides.
► The pad must be separate from any structure.
► The pad must be level.
► The pad must be high enough above grade to allow for drainage.
► The pad location must comply with National, State, and Local codes.
These instructions are intended to provide a method to tie -down system to
cement slab as a securing procedure for high wind areas. Check Local
Codes for tie -down methods and protocols.
The dimension
see unit dimensions.
0 0
0 0
•• O o
See Detail A
#7 X 3/8" Self Tapping Screws
(Don't exceed 3/8" long)
Brackets:
2" width, 1/16"thickness,
Detail A height as required.
Available from distributor
or in market place,
ze
1/4" X 1-1/2" Hex Washer Head Concrete Screws
(3/16" pilot hole needed. Pilot hole should be 1/4" deeper
than the fastener embedment)
Figure 8
Data subject to change 11.2019 1 Bosch Thermotechnology Corp.
Installation Instructions Bosch IDS BOVA 19
5 Refrigerant line considerations
5.4 Reuse existing refrigerant lines
5.1 Refrigerant line and service valve connection sizes
Models Suction Liquid
Line Suction Line Liquid Line CAUTION:
Connection Connection ► If using existing refrigerant lines make certain that all joints
BOVA-36 3/4 3/8 3/4 3/8 are brazed, not soldered.
BOVA-60 7/8 3/8 7/8 3/8
Table 3 For retrofit applications, where the existing refrigerant lines will be used, the
following precautions should betaken:
5.2 Required refrigerant line length ► Ensure that the refrigerant lines are the correct size. Refer to Section 2.2
and Table 2.
Determine required line length (Fig. 9). Refer to Section 2.2.
► Ensure that the refrigerant lines are free of leaks, acid, and oil.
The manufacturer recommends installing only approved matched indoor
1 and outdoor systems. All of the manufacturer's split systems are AHRI
rated only with TXV indoor systems. Some of the benefits of installing
approved matched indoor and outdoor split systems are maximum
efficiency, optimum performance and the best overall system reliability.
rigule a
5.3 Refrigerant line insulation
1 The Suction Line must always be insulated. DO NOT allow the Liquid Line
and Suction Line to come in direct (metal to metal) contact.
Figure 11
rigule lu
Bosch Thermotechnology Corp. 111.2019 Data subject to change
10 1 Bosch IDS BOVA Installation Instructions
6 Refrigerant line routing • Comply with National, State, and Local Codes when isolating line sets from
1 joists, rafters, walls, or other structural elements.
6.1 Precautions
Take precautions to prevent noise within the building structure due to
1 vibration transmission from the refrigerant lines. For Example:
► When the refrigerant lines have to be fastened to floorjoists or
other framing in a structure, use isolation type hangers.
► Isolation hangers should also be used when refrigerant lines are
run in stud spaces or enclosed ceilings.
► Where the refrigerant lines run through a wall or sill, they should
be insulated and isolated.
► Isolate the lines from all ductwork.
► Minimize the number of 900 turns.
8 Feet Maximum
/ Joist/Rafter
0 0
0 0 Isolator
0 0
0 0
0
0 0
0 0
0 0
o 0
Side View I
8 Feet Maximum Line Set
Secure Suction Line from joists using isolators every 8 ft. Secure
Liquid Line directly to Suction Line using tape, wire, or other
appropriate method every 8 ft.
Isolation From Joist/Rafter
Figure 12
8 Feet Maximum
/ Wall
0
Ll
I
Side View 8 Feet Maximum
Secure Suction Line using isolators every 8 ft. Secure Liquid Line
directly to Suction Line using tape, wire, or other appropriate
method every 8 ft.
Isolation In Wall Spaces
Figure 13
Isolator
Line Set
Data subject to change 11.20191 Bosch Thermotechnology Corp.
Installation Instructions Bosch IDS BOVA 111
lant
Insulation
�uction Line
Isolation Through Wall
Figure 14
7 Refrigerant line brazing
7.1 Braze the refrigerant lines
1. Remove caps or plugs. Use a deburing tool to debur the pipe ends. Clean both
internal and external surfaces of the tubing using an emery cloth.
Figure 15
DO NOT hang line sets from ductwork
Bosch Thermotechnology Corp.111.2019 Data subject to change
12 1 Bosch IDS BOVA Installation Instructions
2. Remove the pressure tap cap from both service valves.
Figure 16
3. Purge the refrigerant lines and indoor coil with dry nitrogen.
Figure 1 r
4. Wrap a wet rag around the valve body to avoid heat damage and continue the
dry nitrogen purge (Fig. 18).
Braze the refrigerant lines to the service valves.
All units come standard with a bi-fl ow filter drier. Braze the filter drier to the
liquid line, using caution not to push the refrigerant line too hard past the stop
within the filter drier (this could damage the drier).
Continue the dry nitrogen purge. Do not remove the wet rag until all brazing is
completed.
11-1 Remove the wet rag before stopping the dry nitrogen purge.
Shipped loose
field installed
3-4" from valve
d
d d d
Figure 18
5. Replace the pressure tap caps after the service valves have cooled.
Figure 19
Data subject to change 11.2019 1 Bosch Thermotechnology Corp.
Installation Instructions Bosch IDS BOVA 113
8 Refrigerant line leak check
8.1 Checkforleaks
1. Pressurize the refrigerant lines and evaporator coil to 150 PSIG using dry
nitrogen.
150 PSIG
Figure 20
2. Check for leaks by using a soapy solution or bubbles at each brazed location.
rigute z1
9 Evacuation
9.1 Evacuate the refrigerant lines and indoor coil
Do not open the service valves until the refrigerant lines and indoor coil
1-19 leak check and evacuation are complete.
1. Evacuate until the micron gauge reads no higher than 350 microns, then close
the valve to the vacuum pump.
0350
Microns
0
ON OFF
Figure 22
2. Observe the micron gauge. Evacuation is complete if the micron gauge does not
rise above 500 microns in one (1) minute.
Once evacuation is complete blank off the vacuum pump and micron gauge,
and close the valves on the manifold gauge set.
Figure 23
Bosch Thermotechnology Corp.111.2019 Data subject to change
141 Bosch IDS BOVA Installation Instructions
10 Servicevalves
10.1 Open the service valves
AWARNING:
► Extreme caution should be exercised when opening the
Liquid Line Service Valve. Turn counterclockwise until the
valve stem just touches the rolled edge. No torque is required.
Failure to follow this warning will result in abrupt release
of system charge and may result in personal injury and /or
property damage.
Leak check and evacuation must be completed before opening the service
1 valves. The brazed line set valves should be used for leak checking and
vacuuming. Using the separate suction port for this process will result in
loss of charge with in compressor section.
The Suction Service Valve must be opened first BEFORE opening the
1 Liquid Service Valve!
1. Remove Service Valve Cap (Fig 24).
2. Fully insert hex wrench into the stem and back out counterclockwise until valve
stem just touches the rolled edge (approximately five (5) turns.)
3. Replace the Valve Stem Cap to prevent leaks. Tighten finger tight plus an
additional 1/6 turn.
4. Repeat STEPS 1.3 for Liquid Service Valve.
Cap
5/16" Hex Wrench
for Suction Service Valve
Unit Side 3/16" Hex Wrench
of Service Xfor Liquid Service Valve
Valve
Rolled Edge to
� Captivate Stem
\ a/,,'�Valve
Hex Headed
System
Figure 24
Data subject to change 11.20191 Bosch Thermotechnology Corp.
Installation Instructions Bosch IDS BOVA 115
11 Electrical • low voltage
11.1 Low Voltage Maximum Wire Length
Table 4 defines the maximum total length of low voltage wiring from the outdoor unit,
to the indoor unit, and to the thermostat.
24 Volts -Wire size Max.WireLength
18 AWG 150 Ft.
16 AWG 225 Ft.
14 AWG 300 Ft.
Table 4
11.2 Low voltage hook-up diagrams
Figure 25
Air Handler Hook-up Diagram
qnn t 914 th--tat
Support 3H thermostat
vit ....................
I
W1..................
❑I
8
I
El
I
El
E
El
Z w I w
1"0J
THERMOSTAT r = I a
o m 3 w
c7 I m r m o_
G 8 C lvl w2 i McY 8 W
I
INDOOR UNIT I OUTDOOR UNIT
Control Wiring for H/P Systems.
Notes:
Be sure power supply agrees withequipment nameplate.
Twin -stage auxiliary heating(Supported by 3H thermostat)
Power wiring and grounding of equipment must comply with local codes.
W: Electric auxiliary heat signal.
Low voltage wiring to be No. 18 AWGminimum conductor.
W1:The first stage Field installed electric auxiliary heat signal.
"-. - . -.... Field installed electric auxiliary heat connection
W2:The second stage Field installed electric auxiliary heat signal.
Single -stage auxiliary heating (Supported by 2H thermostat)
The outdoor unit W signal is connected to the Electric auxiliary heat or
the first stage Electric auxiliary heat.
Bosch Thermotechnology Corp. 111.2019 Data subject to change
16 1 Bosch IDS BOVA Installation Instructions
12 Electrical • high voltage
12.1 High voltage power supply
AWARNING: LIVE ELECTRICAL COMPONENTS!
► During installation, testing, servicing, and trouble shooting of
this product, it may be necessary to work with live electrical
components. Failure to follow all electrical safety precautions
when exposed to live electrical components could result in
death or serious injury.
The high voltage power supply must match the equipment nameplate.
FilPower wiring must comply with national, state, and local codes.
Follow instructions on unit wiring diagram located on the inside of the control box
cover and in the Service Facts document included with the unit.
Figure 27
12.2 High voltage disconnect switch
Install a separate disconnect switch at the outdoor unit.
Field provided flexible electrical conduit must be used for high voltage wiring.
Figure 28
12.3 High voltage ground
Ground the outdoor unit per national, state, and local code requirements.
rigufe zu
Data subject to change 11.2019 1 Bosch Thermotechnology Corp.
Installation Instructions Bosch IDS BOVA 117
13 Start up
13.1 System startup
1. Ensure Sections 7, 8, 9,10,11, and 12 have been completed.
2. Set System Thermostat to OFF.
itco +
pm
,FC
,J
l 72.0
Figure 30
3. Turn on disconnect to apply power to the indoor and outdoor units.
Figure 31
4. Wait one (1) hour before starting the unit if compressor crankcase heater is
used and the outdoor ambient temperature is below 70 OF.
Figure 32
5. Set system thermostat to ON.
Figure 33
,aoow
I-) 720
L —
Bosch Thermotechnology Corp. 111.2019 Data subject to change
18 Bosch IDS BOVA wpISta Itlon IIt1CtIQ116#
14 System charge adjustment
14.1 Charging: weigh-in method
Weigh-in method is recommended for the initial installation, or anytime a system
charge is being replaced. Weigh-in method can also be used when power is
not available to the equipment site or operating conditions (indoor/Outdoor
temperatures) are not in range to verify with the subcooling charging method.
Charge multiplier for
Model Factory Charge interconnecting refrigerant
tube length
All models The data on nameplate 0.6 oz/ft
Table 5
11-1 The factory charge in the outdoor unit is sufficient for 15 feet of standard
size interconnecting liquid line.
New Installations —Calculating additional charge for lineset greater than 15 ft.
1. Total Line Length (ft) _ (a)
2. Standard Lineset (ft) = 15 (b)
3. (a) minus (b) _ (c)
4. Refrigerant Multiplier = 0.6 oz ft (d)
5. Refrigerant Adder (c'd) _ (e)`
If lineset is less than 15 ft. (e) = 0
Sealed -System Repairs —Calculating total system charge.
1. Total Line Length (ft) _ (a)
2. Standard Lineset(ft) = 15 (b)
3. (a) minus (b) _ (c)
4. Refrigerant Multiplier = 0.6 oz ft (d)
5. Refrigerant Adder (c'd) = (e)'
6. Factory Charge (namplate) = (f)
7. Total System Charge (e+f) = _
'if lineset is less than 15 ft, (e) = 0
The only mode approved for validating system charge is while in Cooling
1 "Charge Mode". Outdoor Temperature must be between 55°F and 120oF
with Indoor Temperature kept between 70°F and BOY.
14.2 Subcooling charging and refrigerant adjustment in cooling
(above 551 outdoor temp.)
1. Check the outdoor ambient temperatures.
Subcooling (in cooling mode) is the only recommended method of charging
above 550F outdoor ambient temperatures.
For outdoor ambient temperatures below 55°F , use weigh-in charge method.
It is important to return in the spring or summer to accurately charge the
' system in the cooling mode when outdoor ambient temperature is above
55eF.
Outdoor
Outdoor
Temperature
Temperature
Above 550F
Below 55°F
X
X
120OF
J
550F
1X
550F
J
Outdoor Tempi
OutdoorTemp2
Figure 34
For best results the indoor temperature should be kept between 70OF to 80eF.
8I0 OF
J
7001
X
X
Indoor Temp
Figure 35
2. Ensure Sections 7, 8, 9, 10, and 13 have been completed.
Data subject to change 11.20191 Bosch Thermotechnology Corp.
Installation Instructions Bosch IDS:O
3. Stabilize the system. If calculated subcooling value is lower than the design subcoolingvalue
1 (Table 8), please add refrigerant. Repeat steps 3 through 5.
After starting the system in cooling mode, short press "FORCE" button, and
""'symbol should appear. System may take 10 minutes to ramp up. Operate
the system for a minimum of twenty (20) minutes. Suction Final Superheat ff)
Temp 8 1 12 14 16 18 20 22
After a twenty (20) minute stabilization period operating at 100%Suction
capacity (76 Hertz on BOVA-36 and 65 Hertz on BOVA-60), maintain
continuous operation while adjusting refrigerant charge or TXV. After 40 101 97 93 89 86 82 78 75
adjusting, operate system for a minimum of five (5) minutes for system to 42 105 101 97 93 89 86 82 78
stabilize, otherwise repeat step 3. 44 110 105 101 97 93 89 86 82
46 114 110 105 101 97 93 89 86
11110 105 101 97 93 89
48
118
4
50
123
118
114
110
105
101
97
93
52
128
123
118
114
110
105
101
97
54
133
128
123
118
114
110
105
101
56
138
133
128
123
118
114
110
105
58
143
138
133
128
123
118
114
110
60
148
143
138
133
128
123
118
114
Figure 36
62
153
148
143
138
133
128
123
118
64
159
153
148
143
138
133
128
123
4. Calculate superheat value on suction valves (According to Table 6 )
66
164
159
153
148
143
136
133
128
►
Measured Suction Line Temp = OF
68
170
164
159
153
14B
143
138
133
►
Measured Suction Line Pressure = PSIG
70
176
170
164
159
153
148
143
138
►
Calculate superheat value = OF
72
182
176
170
164
159
153
148
143
Table 6
R-410A Refrigerant chart - Final Superheat
For indoorunitwithadjustableTXV,setsubcoolingandadjustsuperheat
5-1
via adjustable TXV according to Table 8. For indoor unit with non
„
adjustable TXV, check the superheat and set correct subcooling according
Liquid
to superheat, refer to Table 8.
Temp
ff)
•
Liquid
Gauge
1
Pressure
(PSI)
55
173
176
179
182
185
188
191
195
5. Calculate subcooling value on liquid valves (According to Table 7 )
60
188
191
195
198
201
204
208
211
►
Measured Liquid Line Temp. _ OF
65
204
208
211
215
218
221
225
229
►
Measured Liquid Line Pressure = PSIG
70
221
225
229
232
236
239
243
247
►
Calculate subcooling value = OF
75
239
243
247
251
255
259
262
266
80
259
262
266
270
275
279
283
287
85
279
283
287
291
295
300
304
309
90
300
304
309
313
318
322
327
331
95
322
327
331
336
341
346
351
355
100
346
351
355
360
365
370
376
381
105
370
376
381
386
391
397
402
407
110
397
402
407
413
418
424
430
435
115
424
430
435
441
447
453
459
465
120
453
459
465
471
477
483
489
496
125
483
489
469
502
508
515
521
528
Table 7 R-410A Refrigerant chart- Final Subcooling
Figure 37
Bosch Thermotechnology Corp.111,2019 Data subject to change
2 0 1 Bosch IDS BOVA Installation Instructions
24K/36K
48K
60K
Table 8
7. Stabilize the system.
'
► Wait 5 minutes for the system condition to stabilize between adjustments.
Specification applicable for
indoor
When the subcooling match the chart, the system is properly charged.
units with adjustable
10±2 10-18'
or non-adjustable TXV
Specification applicable
8±2 7•-10 for indoor units with non-
► Remove gauges.
adjustable TXV
► Replace service port caps to prevent leaks. Tighten finger tight plus an
Specification applicable for
additional 1/6 turn.
8±2 9-18 indoor units with adjustable
or non-adjustable TXV
8. Record System Information for reference (Table 9).
Specification applicable
6+2 7-9 for indoor units with non-
adjustable TXV
Specification applicable for
8±2 8_18 indoor units with adjustable
or non-adjustable TXV
Specification applicable
6±2 6_8 for indoor units with non-
adjustable TXV
6. Adjust refrigerant level to attain proper gauge pressure.
M1• Add refrigerant if the subcooling reading from Table 7 is lower
than the designed value (Table 8).
► Connect gauges to refrigerant bottle and unit as illustrated (Fig 38).
► Purge all hoses.
► Open tank.
► Stop adding refrigerant when subcooling matches the charging chart (Table
7) Final Subcooling value.
Recover refrigerant if the subcooling reading from Table 7 is higher than
1 the designed value (TableB)."
Figure 38
Record system pressures and temperatures after charging is complete.
Description
Outdoor model number
Measured Outdoor Ambient °F
Measured Indoor Ambient °F
Measured Liquid Line Temp °F
Measured Suction Line Temp °F
Liquid Gauge Pressure PSIG
Suction Gauge Pressure PSIG
Table 9
Data subject to change 11.20191 Bosch Thermotechnology Corp.