BLD2023-1385_Manufacturer_Specifications_and_Installation_Instructions_11.1.2023_11.01.14_AM_3874122INSTALLATION INSTRUCTIONS
Fan Coils
FEM4X, FSM4X, FSU4X, FXM4X
These instructions must be read and understood completely before attempting installation.
Safety Labeling and Signal Words
DANGER, WARNING, CAUTION, and
NOTE
The signal words DANGER, WARNING,
CAUTION, and NOTE are used to identify levels of
hazard seriousness. The signal word DANGER is
only used on product labels to signify an immediate
hazard. The signal words WARNING, CAUTION,
and NOTE will be used on product labels and
throughout this manual and other manuals that may
apply to the product.
DANGER - Immediate hazards which will result in
severe personal injury or death.
WARNING - Hazards or unsafe practices which
could result in severe personal injury or death.
CAUTION - Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.
NOTE - Used to highlight suggestions which will
result in enhanced installation, reliability, or
operation.
TABLE OF CONTENTS
Introduction .................................... 1
Location ....................................... 2
Clearances .................................... 2
Heater Packages ............................... 2
Position Unit ................................... 2
Air Ducts ...................................... 7
Electrical Connections .......................... 7
Refrigerant Tubing ............................. 11
Refrigerant Metering Device .................... 11
Condensate Drains ............................ 11
Accessories .................................. 12
Sequence of Operation ......................... 12
Start-up Procedure ............................ 13
Care and Maintenance ......................... 13
Airflow Performance ........................... 15
R-410A Quick Reference Guide ................. 18
Signal Words in Manuals
The signal word WARNING is used throughout this
manual in the following manner:
The signal word CAUTION is used throughout this
manual in the following manner:
Signal Words on Product Labeling
Signal words are used in combination with colors
and/or pictures on product labels.
PERSONAL INJURY, AND/OR PROPERTY DAMAGE
HAZARD
Failure to carefully read and follow this warning could
result in equipment malfunction, property damage,
personal injury and/or death.
Installation or repairs made by unqualified persons
could result in equipment malfunction, propertydam-
age, personal injury and/or death.
The information contained in this manual is intended
for use by a qualified service technician familiar with
safety procedures and equipped with the proper
tools and test instruments.
Installation must conform with local building codes
and with the National Electrical Code NFPA70 current
edition.
INTRODUCTION
Models FEM4X, FSM4X, and FXM4X are designed for
maximum flexibility and can be used for upflow, horizontal left
or right, and downflow applications (accessory kit required
for downflow or horizontal right).
496 01 5402 04 Mar/2016
INSTALLATION INSTRUCTIONS
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
Model FSU4X is designed for upf low installation, and can be
field modified for downflow and horizontal left or right
applications (accessory kits required for downflow or
horizontal).
FEM4X and FXM4X models are available for system sizes
1-1/2 - 5 tons (18,000 - 60,000 BTUH) nominal cooling
capacity.
FSM4X, and FSU4X models are available for system size 5
ton (60,000 BTUH) nominal cooling capacity.
FEM4X and FXM4X models use an ECM motor and have a
factory installed and appropriately sized hard shut-off TXV
metering device and are for R-410A refrigerant ONLY.
FSM4X and FSU4X models use a PSC motor and have a
factory installed and appropriately sized hard shut-off TXV
metering device and are for R-410A refrigerant ONLY.
Factory approved electric heater packages are available in
sizes 3kW through 30kW. See Product Specification
literature for available accessory kits.
LOCATION
Select the best position which suits the installation site
conditions. The location should provide adequate structural
support, space in the front of the unit for service access,
clearance for return air and supply duct connections, space
for refrigerant piping connections and condensate drain line
connections. If heaters are being installed make sure
adequate clearance is maintained from supply duct work.
Nuisance sweating may occur if the unit is installed in a high
humidity environment with low airflow. On these installations a
wrap of 2"(51 mm) fiberglass insulation with a vapor barrier is
recommended.
REQUIRED CLEARANCES - ALL MODELS inches
No
Heaters
All Sides
0
From Supply Duct
0
With
Heaters
All ides
0
From First 3 feet of Supply Duct to Combustibles
1
From Supply Duct to Combustibles after 3 feet
0
NOTE: Internal filter can be accessed from separate filter
door. If the filter can NOT be easily accessed, a remote filter
is recommended. Refer to ACCA Manual D for remote filter
sizing.
FIRE HAZARD
Failure to maintain proper clearances could result in per-
sonal injury, death, and/or property damage.
When heaters are installed, maintain clearances from
combustible materials as specified on unit rating plate.
Do not use plastic lined or combustible flexible ducting
within 36 inches (1 m) of the supply end of the fan coil.
HEATER PACKAGES
Factory approved, field installed, UL listed heater packages
are available from the equipment supplier. See unit rating
plate for a list of factory approved heaters. Heaters that are
not factory approved could cause damage which would not
be covered under the equipment warranty.
POSITION UNIT
Unit can stand or lie on floor, or hang from ceiling or wall.
Allow space for wiring, piping, and servicing unit.
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property
damage
A field fabricated auxiliary drain pan, with a separate
drain is REQUIRED for all installations over a fin-
ished living space or in any area that may be damaged
by overflow from a restricted main drain pan. In some
localities, local codes require an auxiliary drain pan
for ANY horizontal installation.
A. UPFLOW INSTALLATION
If return air is to be ducted through a floor, set unit on floor
over opening and use 1/8 to 1/4 inch thick (3 to 6 mm thick)
fireproof resilient gasket between duct, unit, and floor.
Side return is afield option on slope coil models. Cut opening
per dimensions shown in Figure 2. A field -supplied bottom
closure is required.
B. MODULAR UNITS
The FSU4X6000, FXM4X4800/6000, FEM4X4800/6000,
and FSM4X4800/6000 fan coils are two-piece modular
units. This allows for modular units to be disassembled and
components moved separately to installation area for
reassembly. This process accommodates small scuttle holes
and limiting entrances to installation sites (refer to Figure 1).
2 496 01 5402 04
INSTALLATION INSTRUCTIONS Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
Figure 2 Upflow Installation
POWER ENTRY FIELD SUPPLIED
OPTIONS � SUPPLY DUCT
LOW VOLT
ENTRY
OPTIONS
FRONT SERVICE CLEARANCE
60 model = 24" (610 mm) °
000 A -COIL
U N ITS
°� °
UPFLOW/DOWNFLOW 1-1/2°
SECONDARY DRAIN I O�
L�1 ° -�
U PFLOW/DOWN FLOW
PRIMARY DRAIN ° / I 19" (483mm)
FIELD MODIFIED
SIDE RETURN
LOCATA SLOPEION CCOILOR
I 2-1/2°
° ° ( 4mm) UNITS ONLY
� I I
UPFLOW/DOWNFLOW � i
SECONDARY DRAIN
°
°
UPFLOW/DOWNFLOW FIELD SUPPLIED
PRIMARY DRAIN RETURN PLENUM
B. DOWNFLOW INSTALLATION
PRODUCT OR PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage
The conversion of the fan coil to downflow requires
special procedures for the condensate drains on both
A -coil and Slope -coil units. The vertical drains have
an overflow hole between the primary and secondary
drain holes. This hole is plugged for all applications
except downflow, and must be used for downflow.
Failure to follow instructions could result in personal
iniury or product and property damaqe.
In this application, field conversion of the evaporator coil is
required using accessory Downflow Kit along with an
accessory Base Kit. Set unit on floor over opening and use
1/8" to 1/4" thick fireproof resilient gasket between duct, unit,
and floor. Refer to installation instructions packaged with
accessory kit. See Product Specification literature for kit part
numbers.
During the conversion process, removed the plastic cap
covering the vertical drains only and discard.
Remove the plug from the overflow hole and discard.
SLOPE COIL UNITS
FEM4X
MODEL SIZE
A
18
12" (305mm)
24
17" (432mm)
30
17" (432mm)
35
19" (483mm)
SLOPE COIL UNITS
FXM4X
MODEL SIZE
A
18
17" (432mm)
24
17" (432mm)
30
19" (483mm)
At completion of the downflow installation, caulk around the
vertical pan fitting to door joint to retain low air leak
performance of the unit.
NOTE: Gasket kit number (EBAC01 GSK) is also required for
all downflow applications to maintain low air leak/low sweat
performance.
C. HORIZONTAL INSTALLATION
Unit must NOT be installed with access panels facing up or
down. Access panels must only face to the side.
FEM4X, FSM4X, and FXM4X models are factory built for
horizontal left installation (refer to Figure 3 and Figure 4).
They can be field converted to horizontal right (accessory
Gasket Kit required, see Product Specification literature for
part number). Refer to Figure 5 and Figure 6.
FSU4X models require accessory kits for any horizontal
installation (see Product Specification literature for required
accessory kits).
NOTE: When suspending unit from ceiling, dimples in casing
indicate suitable location of screws for mounting metal
support straps.
NOTE: For optimum condensate drainage performance in
horizontal installations, unit should be leveled along its length
and width.
496 01 5402 04 3
INSTALLATION INSTRUCTIONS
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
Figure 3 I Horizontal Left Application (Slope Coil) (FXM4X factory configuration)
LOW VOLT
ENTRY
OPTIONS
POWER -
ENTRY
OPTIONS
FHIMAKY
DRAIN
PRIMARY
DRAIN
FRONT SERVICE CLEARANCE
(FULL FACE OF UNIT)
18 - 48 models = 21" (533mm)
60 model = 24" (610mm)
I Figure 4 I Horizontal Left Application (A -Coil) (FEM4X, FSM4X, and FXM4X factory configuration) I
FACTORY SHIPPED
HORIZONTAL LEFT
APPLICATION
HORIZONTAL
DRAIN PAN
AIR SEAL
ASSEMBLY
REFRIGERANT
CONNECTIONS
COIL
BRACKET
COIL
SUPPORT
— RAIL
DRAIN PAN
SUPPORT
•BRACKET
COIL
BRACKET
PRIMARY DRAIN
HORIZONTAL LEFT
- SECONDARY DRAIN
HORIZONTAL LEFT
4 496 01 5402 04
INSTALLATION INSTRUCTIONS
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
Horizontal Right Conversion of Units With Slope Coils
1. Remove blower and coil access panel and fitting panel
(refer to Figure 5).
2. Remove coil mounting screw securing coil assembly
to right side casing flange.
3. Remove coil assembly.
4. Lay fan coil unit on its right side and reinstall coil assembly
with condensate pan down (refer to Figure 5).
5. Attach coil to casing flange using coil mounting screw
previously removed.
6. Align holes with tubing connections and condensate
pan connections, and reinstall access panels and
fitting panel. After brazing, make sure liquid and
suction tube grommets are in place to prevent air
leaks and cabinet sweating.
Figure 5 I Horizontal Right Conversion Applications (Slope Coil) (FXM4X)
COIL MOUNTING Ri rnniFR
COIL SUPPORT
SLOPE
Horizontal Right Conversion of Units With A -Coils
1. Remove blower and coil access panel and fitting panel
(refer to Figure 6).
2. Remove coil mounting screw securing coil assembly
to right side casing flange.
3. Remove coil assembly.
4. Lay fan coil unit on its right side and reinstall coil
assembly with condensate pan down (refer to
Figure 6).
5. Remove horizontal drain pan support bracket from coil
support rail on left side of unit and reinstall on coil
support rail on right side of unit.
6. Convert air -seal assembly for horizontal right (refer to
Figure 6).
a. Remove air -seal assembly from coil by removing 4
screws.
b. Remove coil drip flanges from A -coil and reinstall on
right side of coil (same side as horizontal drain pan).
c. Remove filler plate (A) and install air splitter (B) in
place of filler plate.
d. Install filler plate (A) as shown in horizontal right
application.
e. Remove condensate troughs (C) and install on
opposite tube sheets.
f. Install hose onto plastic spout.
7. Install horizontal pan on right side of coil assembly.
8. Slide coil assembly into casing. Be sure coil bracket on
each corner of vertical pan engages coil support rails.
9. Reinstall 2 snap -in clips to correctly position and
secure coil assembly in unit. Be sure clip with large
offsets is used on right side of unit to secure horizontal
pan.
10. Remove 2 oval coil access panel plugs and reinstall
into holes on left side of coil access panel and fitting
panel.
11. Remove insulation knockouts on right side of coil
access panel
12. Reinstall access fitting panels, aligning holes with
tubing connections and condensate pan connections.
Be sure to reinstall metal clip between fitting panel and
vertical condensate pan.
13. After brazing, make sure liquid and suction tube
grommets are in place to prevent air leaks and cabinet
sweating.
496 01 5402 04 5
INSTALLATION INSTRUCTIONS Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
Figure 6 Horizontal Right Conversion Applications (A -Coil)
A
REFRIGERANT AIR SEAL
CONNECTIONS ASSEMBLY
HORIZONTAL
RIGHT
APPLICATION
COIL
SUPPORT /OO
RAIL
B
COIL C
BRACKET ® m O
DRAIN PAN
SUPPORT d
BRACKET
COIL ��
SUPPORT
RAIL �,
COIL
BRACKET
HORIZONTAL
DRAIN PAN
PRIAMRY DRAIN
HORIZONTAL RIGHT
SECONDARY DRAIN
HORIZONTAL RIGHT
D. MANUFACTURED HOUSING AND MOBILE HOME
APPLICATIONS
1. Fan coil unit must be secured to the structure using
field -supplied hardware.
2. Allow a minimum of 24 inches (610mm) clearance
from access panels.
3. Recommended method of securing for typical
applications:
a. If fan coil is away from wall, attach pipe strap to top
of fan coil using No. 10 self tapping screws. Angle
strap down and away from back of fan coil, remove
all slack, and fasten to wall stud of structure using
5/16" lag screws. Typical both sides of fan coil.
b. If fan coil is against wall, secure fan coil to wall stud
using 1/8" (3mm) wide right-angle brackets. Attach
brackets to fan coil using No. 10 self tapping screws
and to wall stud using 5/16" lag screws (refer to
Figure 7).
NOTE: Modular units can be disassembled and
components moved separately to installation area
for reassembly. This process accommodates small
scuttle holes and limiting entrances to installation
sites (refer to Figure 8).
Figure 7 Mobile Home or Manufactured Hous-
ing Applications
4° (102mm) MAX
SECURE FAN COIL TO STRUCTURE
UNIT AWAY FROM WALL
PIPE STRAP
(TYPICAL BOTH SIDES)
OR
\ UNIT AGAINST WALL
11/8" (3mm) INCH THICK
NGLE MOUNTING BRACKET
(TYPICAL BOTH SIDES)
DOWN FLOW
BASE KIT
ECURE UNIT TO FLOOR
NGLE BRACKET OR PIPE STRAP
m) MAX
6 496 01 5402 04
INSTALLATION INSTRUCTIONS
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
AIR DUCTS
Connect supply -air duct over the outside of 3/4" flanges
provided on supply -air opening. Secure duct to flange using
proper fasteners for type of duct used, and seal duct -to -unit
joint.
It is a recommendation, but not a requirement, to use flexible
connections between ductwork and unit to prevent
transmission of vibration. When electric heater is installed,
use heat -resistant material for flexible connector between
duct work and unit at discharge connection. Duct work
passing through unconditioned space must be insulated and
covered with vapor barrier.
Duct work Acoustical Treatment
Metal duct systems that do not have a 90 degree elbow and
10 feet of main duct before first branch takeoff may require
internal acoustical insulation lining. As an alternative, fibrous
duct work may be used if constructed and installed in
accordance with the latest edition of SMACNA construction
standard on fibrous glass ducts. Both acoustical lining and
fibrous duct work shall comply with National Fire Protection
Association as tested by UL Standard 181 for Class 1 air
ducts.
ELECTRICAL CONNECTIONS
FEM4X (1-1/2 to 4 ton), FSM4X and FSU4X Fan Coil
models utilize an electronic fan board which has a low voltage
circuit protective fuse (5 amp), fan motor speed tap terminal
(SPT), and time -delay relay (TDR). To disable the TDR
feature, snip the jumper wire JW1 (refer to Figure 9).
FEM4X (5 ton) and FXM4X Fan Coil models have a low voltage
circuit protective fuse (3 amp) inline on the wire harness. Speed
selections are made at the fan motor by selecting taps 1, 2, or 3
with the Blue wire. The motor is pre-programmed with the
time -delay circuit on some of the speed taps. (See Section D)
Before proceeding with electrical connections, make certain
that supply voltage, frequency, phase, and circuit ampacity are
as specified on the unit rating plate. See unit wiring label for
proper field high and low voltage wiring.
ELECTRICAL SHOCK or UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal
injury, death, and/or unit damage.
If a disconnect switch is to be mounted on unit, select
a location where drill and fasteners will not contact
electrical or refriqeration components.
Make all electrical connections in accordance with the NEC
and any local codes or ordinances that may apply. Use
copper wire only. The unit must have a separate branch
electric circuit with afield -supplied disconnect switch located
within sight from and readily accessible from the unit.
NOTE: When a pull-out type disconnect is removed from the
unit, only the Load side of the circuit is de -energized. The
Line side remains live until the main (remote) disconnect is
turned off.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Turn off the main (remote) disconnect device before
working on incoming (field) wiring .
Incoming (field) wires on the line side of the discon-
nect found in the fan coil unit remain live, even when
the pull-out is removed. Service and maintenance to
incoming (field) wiring cannot be performed until the
main disconnect switch (remote to the unit) is turned
off.
496 01 5402 04 7
INSTALLATION INSTRUCTIONS Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
A. LINE VOLTAGE CONNECTIONS
Fan Coils installed without electric heat require the use of a
factory -authorized Power Plug Kit (accessory part number
EBAC01 PLG). This kit provides the electrical connections
necessary to supply the unit with 208/230V power when
electric heat is not present. For units without electric heat:
1. Connect 208/230V power leads from field disconnect
to yellow and black stripped leads on Power Plug
(accessory part number EBAC01 PLG).
2. Connect ground wire to unit ground lug.
3. When installing an electric heater, remove and discard
power plug (if equipped) from fan coil and connect
male plug from heater to female plug from unit wiring
harness. (See Electric Heater Installation
Instructions.)
B. 24V CONTROL SYSTEM
Connection to Unit
Wire low voltage in accordance with wiring label on the
blower (also refer to Figure 10 through Figure 14). Use 18
AWG color -coded, insulated (350 C minimum) wire to make
the low -voltage connections between the thermostat, the
unit, and the outdoor equipment. If the thermostat is located
more than 100 feet from the unit (as measured along the low
voltage wire), use 16 AWG color -coded, insulated (350 C
minimum) wire. All wiring must be NEC Class 1 and must be
separated from incoming power leads. Refer to outdoor unit
wiring instructions for additional wiring recommendations.
Heater Staging
The controls are factory circuited for single -stage operation
(refer to Figure 11 and Figure 12). When 2 stages are
desired, cut W3 at the W2 wire nut, strip, and reconnect
according to the thermostat kit instruction (refer to Figure 13
- outdoor thermostat optional). When 3 stages are desired,
cut the W2 wire nut off and discard. Strip W2, W3, and E, and
reconnect according to the thermostat kit instructions (refer
to Figure 14 outdoor thermostats optional).
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper
product operation.
If W2, W3, and E on any 3 stage heater (18, 20, 24, or
30kW) are individually connected - as with outdoor
thermostats or any other situation - emergency heat
relay must be used. If relay is not used, blower may
not operate when heaters are energized.
8 496 01 5402 04
INSTALLATION INSTRUCTIONS
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
Wiring Layout - Air Conditioning
Figure 11
Unit (Cooling and 1-Stage Heat)
THERMOSTAT
FANCOIL
WIRING
R
RED
G
G RY
W
WHT
EVIBLUO
BRN
AIR COND.
C
Y
Y
Wiring Layout - Heat Pump Unit
Figure 12
(Cooling and 1-Stage Heat with No
Outdoor Thermostat)
THERMOSTAT
FANCOIL
HEAT
PUMP
WIRING
(CONTROL)
R
RED
R
G
G RY
C
BRN
C
W
WHT
Jumper
FBL
E
W
O
O
Y Y
Wiring Layout - Heat Pump Unit
Figure 13
(Cooling and 2-Stage Heat with
One Outdoor Thermostat)
THERMOSTAT
FANCOIL HEAT
WIRING (CONTROL)
PUMP
R
RED
R
G
G RY
C
BRN
C
W
WHT
W
Jumper
BLU
E
VIO o
ODTS
O
O
Y
Y
Wiring Layout - Heat Pump Unit
Figure 14
(Cooling and 2-Stage Heat with
Two Outdoor Thermostats)
THERMOSTAT
FANCOIL
WIRING
HEAT
(CONTROL)
PUMP
R
RED
R
G
G RY
C
BRN
C
W
WHT
W
Jumper
BLU
ODTS1
E
VIO
ODTS2
O
O
Y
Y
Transformer Information
Transformer is factory wired for 230V operation. For 208V
applications, disconnect the black wire from the 230V terminal
on transformer and connect it to the 208V terminal (refer to
Figure 15).
496 01 5402 04 9
INSTALLATION INSTRUCTIONS
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
Figure 15 Transformer Connections
SECONDAR
4BROWN
RED
PRIMARY
YELLOW
BLACK
C. GROUND CONNECTIONS
ELECTRICAL SHOCK HAZARD
Failure to establish uninterrupted or unbroken
ground could result in personal injury and/or death.
According to NEC, ANSI/NFPA 70, and local codes,
the cabinet must have an uninterrupted or unbroken
ground in order to minimize potential for personal in-
jury or death if an electrical fault should occur. The
ground may consist of electrical wire or metal conduit
when installed in accordance with existing electrical
codes. If conduit connection uses reducing washers,
a separate ground wire must be used.
NOTE: Use UL listed conduit and conduit connectors for
connecting supply wire(s) to unit to obtain proper grounding.
Grounding may also be accomplished by using grounding lugs
provided in control box.
D. MINIMUM CFM AND MOTOR SPEED SELECTION
Units with or without electric heaters require a minimum CFM.
Refer to the unit wiring label to ensure that the fan speed
selected is not lower than the minimum fan speed indicated.
FEM4X models (1-1/2 to 4 ton): fan speed selection is done at
the fan motor. To change motor speeds, reposition wire at fan
motor speed terminals labeled 1-2-3 (refer to Figure 16).
FSM4X and FSU4X models: fan speed selection is done at
the fan relay on the electronic fan board. To change motor
speeds, disconnect fan lead used on relay terminal (SPT) and
replace with motor speed lead desired (refer to Figure 17).
Save insulating cap and place on motor lead removed from
relay.
NOTE: In low static applications, lower motor speed tap should
be used to reduce possibility of water being blown off coil.
All units have 2 or 3 motor speed taps. Low speed (red or 1) is
designed for mismatch outdoor unit applications. Medium
speed (blue or 2) is designed for straight matched
operations. High speed (black or 3) is used with high external
static duct situations on straight matched systems.
FEM4X (5 ton) and FXM4X models: fan speed is selected
at the motor connector. Units with or without electric heaters
require a minimum CFM. Refer to the unit wiring label to
ensure that the fan speed selected is not lower than the
minimum fan speed indicated.
SPEED TAP SELECTION AT MOTOR CONNECTOR
Tap 1
Low
90 sec off delay
Tap 2
Medium
90 sec off delay
Tap 3
High
90 sec off delay
Tap 4
Electric Heat t
0 sec off delay
Tap 5
Max t
0 sec off delay
t Electric heat airflow is same CFM as Tap 3, but with 0
sec off delay.
$ For high static applications, see Airflow Performance
Tables for max airflow.
To change motor speeds disconnect the BLUE fan lead from
motor connector terminal #2 (factory default position) and
move to desired speed -tap; 1, 2, 3, or 5.
Speed -taps 1, 2, and 3 have a 90 second blower off time
delay pre-programmed into the motor. Speed tap 4 is used
for electric heat only (with 0 second blower time delay) and
the WHITE wire should remain on tap 4. Speed -tap 5 is used
for high static applications, but has a 0 second blower time
delay pre-programmed into the motor (see Airflow
Performance Tables for actual CFM for each tap). Also, see
Figure 16 for motor speed selection location.
NOTE: In low static applications, lower motor speed tap should
oe usea to reduce nosslbWty Ot water oelna blown Ott con.
Figure 16 I FEM4X and FXM4X
t on Motor Speed
Speed Taps may be located on motor,
or on plug close to motor.
00 0 0 0
L11SO18
10 496 01 5402 04
INSTALLATION INSTRUCTIONS
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
REFRIGERANT TUBING
Size and install refrigerant lines according to information
provided with outdoor unit. Route refrigerant lines to the fan
coil in a manner that will not obstruct service access to the
unit or removal of the filter.
1. Find the liquid tube grommet in the small -parts bag
and slide it onto the liquid refrigerant line (field
line -set).
2. Remove the lower door. Remove the tubing plate (with
suction tube grommet) and slide the plate with
grommet onto the refrigerant lines (field line -set), away
from braze joints.
3. Remove rubber plugs from coil stubs using a pulling
and twisting motion. Hold coil stubs steady to avoid
bending or distorting.
4. Wrap TXV and nearby tubing with a heat -sinking
material such as a wet cloth.
5. Fit refrigerant lines into coil stubs. Wrap a heat sinking
material such as a wet cloth behind braze joints.
6. Braze using a Sil-Fos or Phos-copper alloy.
7. After brazing, allow joints to cool. Slide tubing plate
back into place and position grommets around suction
and liquid tubes to ensure air seal.
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product
damage.
Braze with Sil-Fos or Phos-copper alloy on copper -
to -copper joints and wrap a wet cloth around rear of
fitting to prevent damage to TXV.
REFRIGERANT METERING DEVICE
FEM4X, FSM4X, FSU4X, FXM4X
These Fan Coils have a factory installed hard shut-off TXV
designed only for use with R-410A refrigerant. Use only with
outdoor units designed for R-410A.
TXV is factory set and not field adjustable.
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product
damage.
This Fan Coil has a hard shut-off TXV metering de-
vice. A compressor Hard Start Kit is REQUIRED in all
applications where the matching outdoor unit has a
single-phase reciprocating compressor.
CONDENSATE DRAINS
Unit is provided with primary and secondary 3/4" (19mm)
NPT drain connections. Refer to Figures 2, 3, 4, 5, and 6 to
identify the primary and secondary locations. To prevent
property damage and achieve optimum drainage
performance, BOTH primary and secondary drain lines
should be installed and include properly sized condensate
traps (refer to Figure 18). Factory approved condensate
traps are available (accessory part number EBAC01 CTK).
To connect drainlines, the drain connection knock -outs must
be removed. Use a knife to start the opening near the tab and
using pliers, pull the tab to remove the knock -out. Clean the
edge of the opening if necessary. After drain fittings are
installed, caulk the seam between the fitting and the cover to
retain the low leak rating of the unit.
It is recommended the PVC fittings be used on the plastic
condensate pan. Do not over -tighten. Finger -tighten plus
1-1/2 turns. Use pipe dope, to ensure proper seal.
Install traps in the condensate lines as close to the coil as
possible (refer to Figure 20), but avoid blocking filter access
panel.
Install drain lines below the bottom of the drain pan and pitch
the drain lines down from the coil at least'/4 inch per foot of
run (6mm per 0.3m). Horizontal runs over 15 feet (5m) long
must also have an anti -siphon air vents (stand pipes),
installed ahead of the horizontal runs. Extremely long
horizontal runs may require oversized drain lines to eliminate
air trapping.
Route primary drain line to the outside or to a floor drain.
Check local codes before connecting to a waste (sewer) line.
Route the secondary drain line to a place in compliance with
local installation codes where it will be noticed when unit is
operational. Condensate flowing from secondary (overflow)
drain indicates a plugged primary drain - unit requires
service or water damage will occur.
Prime all traps, test for leaks, and insulate in areas where
sweating of the traps and drain lines could potentially cause
water damage. Consult local codes for additional
requirements or precautions.
496 01 5402 04 11
INSTALLATION INSTRUCTIONS
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
If a gravity drain cannot be used, install a condensate pump
Install the pump as close to the indoor section as possible.
PRODUCT or PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
Use only full size P-traps in the condensate line (refer
to Figure 18). Shallow, running traps are inadequate
and DO NOT allow proper condensate drainage (refer
to Figure 19).
ACCESSORIES
A. ELECTRONIC AIR CLEANER
The Electronic Air Cleaner may be connected to FSM4X and
FSU4X fan coils as shown in Figure 21. This method
requires a field supplied transformer. See Electronic Air
Cleaner literature for kit requirements.
Wiring Layout of Electronic Air
Figure 21
Cleaner to Fan Coil (FSM4X &
FSU4X)
CONTROLBOARD
FAN RELAY R G T C C C
230 VAC NO N I I I I
COM I I
WIRE
SPT NO NC
NUT
208/230V COM
24VAC COM
CONVERSION KIT
TO TRANSFORMER
BLOWER
M OTO R
COM 208/230V
TO EAC
FROM MOLEX
PLUG AND
TRANSFORMER
(IN UNIT)
12 496 01 5402 04
INSTALLATION INSTRUCTIONS
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
B. HUMIDIFIER
Connect humidifier and humidistat to fan coil unit as shown in
Figure 22 and Figure 23.
Figure 22 Wiring Layout of Humidifier to Heat
Pump
FAN COIL
THERMOSTAT (CONTROL) HEAT PUMP
(CONTROL)
R RED R
R
G GRY G
C BRN C
r- c
WHT
W2 I WHT BLU Wg
❑E I VIC E
0 i w2
0 0
I
Y L -I-- Y
FAN HUMIDIFIER I RELAY
L �I
115V M
HUMIDISTAT
L
Figure 23
THERMOSTAT
Wiring Layout of Humidifier to Fan
Coil with Electric Heat
IWP►[KUI1
RE� R
G
W2
BLU W
3
V10 E
BRN C AIR COND.
C
Y Y
�HHMIDI�STAT
L
115V M
SEQUENCE OF OPERATIONS
A. CONTINUOUS FAN
Thermostat closes R to G. G energizes fan relay on
electronic fan board which completes circuit to indoor blower
motor. When G is de -energized, there is a 90 second off
delay before relay opens.
B. COOLING MODE
Thermostat energizes R to G, R to Y, and R to O (heat pump
only). G energizes fan relay on electronic fan board which
completes circuit to indoor blower motor. When G is
de -energized, there is a 90 second off delay before fan relay
opens.
C. HEAT PUMP HEATING MODE
Thermostat energizes R to G and R to Y. G energizes fan
relay on electronic fan board which completes circuit to
indoor blower motor. When G is de -energized, there is a 90
second off delay before fan relay opens.
D. HEAT PUMP HEATING WITH AUXILIARY
ELECTRIC HEAT
Thermostat energizes R to G, R to Y, and R to W. G
energizes fan relay on PCB which completes circuit to indoor
blower motor. W energizes electric heat relay(s) which
completes circuit to heater element(s). When W is
de -energized, electric heat relay(s) open, turning off heater
elements. When G is de -energized there is a 90 second off
delay before fan relay opens.
E. ELECTRIC HEAT OR EMERGENCY HEAT MODE
Thermostat closes R to W. W energizes electric heat relay(s)
which completes circuit to heater element(s). Blower motor
is energized through normally closed contacts on fan relay.
When W is de -energized, electric heat relay(s) opens.
START-UP PROCEDURE
Refer to outdoor unit Installation Instructions for system
start-up instructions and charging method details.
CARE AND MAINTENANCE
The system should be regularly inspected by a qualified
service technician. Consult the servicing dealer for
recommended frequency.
Between visits, the only consumer service recommended or
required is air filter maintenance and condensate drain
operation.
Air Filter
Inspect air filters at least monthly and replace or clean as
required. Disposable type filters should be replaced.
Reusable type filters may be cleaned by soaking in mild
detergent and rinsing with cold water. Install filters with the
arrows on the side pointing in the direction of air flow.
Condensate Drain
During the cooling season check at least monthly for free flow
of drainage and clean if necessary.
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in poor unit
performance and/or product damage.
Never operate unit without a filter. Factory authorized
filter kits must be used when locating the filter inside
the unit. For those applications where access to an
internal filter is impractical, a field -supplied filter
must be installed in the return duct system.
496 01 5402 04 13
INSTALLATION INSTRUCTIONS
AIRFLOW PERFORMANCE TABLES
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
AIRFLOW
PERFORMANCE
- CFM at a given Speed and Static reading
Model
Blower Speed
Measured Static
0.10 0.20
Pressure, inlet to outlet (inches water column)
0.30 0.40 0.50 0.60
FEM4X1800
High
766
739
706
666
619
566
Medium
701
659
619
578
538
499
Low
614
572
530
486
441
396
FEM4X2400
High
941
905
868
830
792
753
Medium
823
786
747
707
665
622
Low
633
583
533
482
431
378
FEM4X3000
High
1130
1097
1063
1028
992
955
Medium
1033
1000
965
928
888
846
Low
840
802
760
713
663
609
FEM4X3500
High
1437
1398
1354
1308
1257
1204
Medium
1282
1238
1192
1142
1090
1036
Low
1168
1 1118
1067
1014
959
903
FEM4X3600
High
1479
1437
1392
1344
1293
1240
Medium
1327
1282
1236
1187
1135
1081
Low
1192
1151
1100
1039
970
890
FEM4X4200
High
1616
1578
1533
1480
1420
1353
Medium
1479
1437
1392
1344
1293
1240
Low
1303
1258
1211
1161
1108
1054
FEM4X4800
High
1805
1772
1739
1704
1669
1632
Medium
1 1652
1617
1 1581
1 1543
1 1504
1 1463
Low
1 1458
1418
1 1377
1335
1 1292
1248
AIRFLOW PERFORMANCE - CFM at a given Speed and Static reading
Model
Blower Speed
Measured Static Pressure, inlet to outlet (inches water column)
0.10 0.20 0.30 0.40 0.50 0.60
FEM4X6000
Tap 5
1897
1867
1836
1808
1774
1736
Tap 4
1817
1785
1757
1724
1693
1655
Tap 3
1817
1785
1757
1724
1693
1655
Tap 2
1657
1 1621
1 1589
1557
1 1518
1 1474
Tap1
1443
1 1412
1 1377
1332
1 1286
1243
AIRFLOW PERFORMANCE - CFM at a given Speed and Static reading
Model
Blower Speed
Measured Static
0.10 0.20
Pressure, inlet to outlet (inches water column)
0.30 0.40 0.50 0.60
FSM4X6000
FSU4X6000
High
2128
2050
1965
1875
1778
1674
Medium
1959
1898
1829
1750
1663
1566
Low
1748
1709
1659
1598
1525
1442
14 496 01 5402 04
INSTALLATION INSTRUCTIONS
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
AIRFLOW PERFORMANCE - CFM at a given Speed and Static reading
Model
Blower Speed
Measured Static
0.10 0.20
Pressure, inlet to outlet (inches water column)
0.30 0.40 0.50 0.60
FXM4X1800
Tap 5
776
745
696
660
609
572
Tap 4
683
644
589
548
494
461
Tap 3
683
644
589
548
494
461
Tap 2
631
563
500
443
409
361
Tap
625
524
457
417
367
319
FXM4X2400
Tap 5
956
920
891
851
816
780
Tap 4
825
795
757
722
674
634
Tap 3
825
795
757
722
674
634
Tap 2
726
695
635
598
543
509
Tap
631
563
500
443
409
361
FXM4X3000
Tap 5
1189
1151
1104
1050
1003
959
Tap 4
1041
998
944
886
837
772
Tap 3
1041
998
944
886
837
772
Tap 2
924
876
817
752
704
660
Tap
779
693
628
571
526
476
FXM4X3600
Tap 5
1363
1332
1294
1253
1207
1157
Tap 4
1237
1206
1160
1121
1070
1013
Tap 3
1237
1206
1160
1121
1070
1013
Tap 2
1095
1058
1007
951
888
824
Tap
1014
885
773
673
609
549
FXM4X4200
Tap 5
1519
1490
1454
1419
1379
1332
Tap 4
1437
1403
1366
1333
1294
1245
Tap 3
1437
1403
1366
1333
1294
1245
Tap 2
1257
1226
1191
1141
1090
1033
Tap1
1237
1206
1160
1121
1070
1013
FXM4X4800
Tap 5
1757
1725
1693
1653
1614
1576
Tap 4
1664
1626
1593
1552
1517
1477
Tap 3
1664
1626
1593
1552
1517
1477
Tap 2
1459
1420
1379
1336
1298
1259
Tap1
1301
1241
1195
1150
1102
1039
FXM4X6000
Tap 5
2030
1995
1961
1927
1888
1842
Tap 4
1811
1775
1740
1703
1664
1613
Tap 3
1811
1775
1740
1703
1664
1613
Tap 2
1665
1632
1593
1556
1507
1453
Tap1
1462
1418
1371
1327
1278
1228
NV I tS:
1. Airflow based upon dry coil at 230v with factory approved finer and electric heater (2 element heater sizes 1800 through 3600, 3 element heater sizes 4200 through
6000).
2. Airflow at 208 volts is approximately the same as 230 volts because the ECM motor is a constant torque motor. The torque doesn't drop off at the speeds the
motor operates.
3. To avoid potential for condensate blowing out of drain pan prior to making drain trap: Return static pressure must be less than 0.40 in. wc. Horizontal
applications of 4200 - 6000 sizes must have supply static greater than 0.20 in. wc.
4. Airflow above 400 cfm/ton on 4800 - 6000 size could result in condensate blowing off coil or splashing out of drain pan.
5. Not recommended for use above 0.60 inches water column external static pressure.
6. Shading - Airflow outside 450 cfm/ton.
496 01 5402 04 15
INSTALLATION INSTRUCTIONS
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
STATIC PRESSURE DROP ACROSS FILTER (inches of water column)
FEM4X
CFM
400
600
800
1000
1200
1400
1600
1800
2000
1800
0.020
0.044
0.075
2400
-
0.044
0.075
0.110
-
-
-
-
-
3000
-
-
0.048
0.072
0.100
-
-
-
-
3500
3600
-
-
-
0.072
0.100
0.130
-
-
-
4200
-
-
-
-
0.070
0.092
0.120
-
-
4800
-
-
-
-
-
0.092
1 0.120
1 0.152
1 -
6000
0.086
1 0.105
1 0.130
STATIC PRESSURE CORRECTION FROM DRY TO WET COIL (inches of water column)
Airflow performance chart was developed using fan coils with DRY coils.
When taking a static reading across a WET coil, adjust the static pressure numbers by adding the values in this table (for a given
CFM, wet coil will have greater static pressure drop than dry coil).
FEM4X
CFM
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
1800
0.034
0.049
0.063
2400
0.016
0.027
0.038
0.049
0.059
3000
-
-
-
0.049
0.059
0.070
0.080
-
-
-
-
-
-
-
-
-
3500
-
-
-
-
-
0.055
0.064
0.073
0.081
-
-
-
-
-
-
-
3600
-
-
-
-
-
0.034
0.042
0.049
0.056
-
-
-
-
-
-
-
4200
-
-
-
-
-
-
-
0.049
0.056
0.063
0.070
-
-
-
-
-
4800
-
-
-
-
-
-
-
-
-
0.038
0.043
0.049
0.054
0.059
-
I -
6000
0.049
0.054
0.059
0.065
10.070
STATIC PRESSURE DROP ACROSS FILTER (inches of water column)
FSM4X
FSU4X
CFM
400 600 800 1000 1200 1400 1600 1800 2000
6000
0.120
0.152
0.187
STATIC PRESSURE CORRECTION FROM DRY TO WET COIL (inches of water column)
Airflow performance chart was developed using fan coils with DRY coils.
When taking a static reading across a WET coil, adjust the static pressure numbers by adding the values in this table (for a given CFM, wet
coil will have greater static pressure drop than dry coil).
FSM4X
CFM
FSU4X
500 600 700 800 900 1000 1100 1200 1300 1400 1 1500 1 1600 1 1700 1 1800 1 1900 1 2000
6000
0.027
10.031
10.035
10.039
10.043
16 496 01 5402 04
INSTALLATION INSTRUCTIONS
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
STATIC PRESSURE DROP ACROSS FILTER (inches of water column)
FXM4X
CFM
400 600 800 1000 1200 1400 1600 1800 2000
1800
0.020
0.044
0.075
2400
-
0.022
0.048
0.072
0.100
-
-
-
-
3000
-
0.022
0.048
0.072
0.100
-
-
-
-
3600
-
-
-
0.051
0.070
0.092
0.120
0.152
-
4200
-
-
-
0.051
0.070
0.092
0.120
0.152
-
4800
-
-
-
0.051
0.070
0.092
0.120
0.152
-
6000
0.086
0.105
0.130
STATIC PRESSURE CORRECTION FROM DRY TO WET COIL (inches of water column)
Airflow performance chart was developed using fan coils with DRY coils.
When taking a static reading across a WET coil, adjust the static pressure numbers by adding the values in this table (for a given CFM, wet
coil will have greater static pressure drop than dry coil).
FXM4X
CFM
500 600 700 800 900 1000 1 1100 1200 1 1300 1400 1 1500 1600 1700 1800 1 1900 2000
1800
0.034
0.049
0.063
2400
0.016
0.027
0.038
0.049
0.059
3000
-
-
-
0.049
0.059
0.070
0.080
-
-
-
-
-
-
-
-
-
3600
-
-
-
-
-
0.055
0.064
0.073
0.081
-
-
-
-
-
-
-
4200
-
-
-
-
-
-
-
0.049
10.056
0.063
0.070
1 -
-
-
-
-
4800
-
-
-
-
-
-
-
-
-
0.038
0.043
10.049
0.054
0.059
-
-
6000
0.027
10.031
0.035
0.039
0.043
STATIC PRESSURE CORRECTION FOR ELECTRIC HEATERS (inches of water column)
Airflow performance chart was developed using fan coils with 10 kW electric heater (2 elements) in the 1800 - 3600 model
sizes, and 15 kW electric heaters (3 elements) in the 4200 - 6000 model sizes.
When using a different number of heater elements, adjust the static pressure numbers by adding or subtracting the values
in this table (for a given CFM, more electric heater elements create higher static pressure drop).
FEM4X
FSM4X
FSU4X
FXM4X
Heater kW
No Heater 5 8 or 10 1 9 or 15 20 18, 24, or 30
Number of Heat Elements
0 1 2 3 4 6
1800
+0.02
+0.01
0
-0.02
-0.04
-
2400
+0.02
+0.01
0
-0.02
-0.04
-
3000
+0.02
+0.01
0
-0.02
-0.04
-
3500
+0.02
+0.01
0
-0.02
-0.04
-
3600
+0.02
+0.01
0
-0.02
-0.04
-
4200
+0.04
-
+0.02
0
-0.02
-0.10
4800
+0.04
-
+0.02
0
-0.02
-0.10
6000
+0.04
-
+0.02
0
-0.02
-0.10
496 01 5402 04 17
INSTALLATION INSTRUCTIONS
R-410A QUICK REFERENCE GUIDE
Fan Coils: FEM4X, FSM4X, FSU4X, FXM4X
• R-410A refrigerant operates at 50% - 70% higher pressures than R-22. Be sure that servicing equipment and
replacement components are designed to operate with R-410A.
• R-410A refrigerant cylinders are rose colored.
• Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
• R-410A systems should be charged with liquid refrigerant. Use a commercial type metering device in the
manifold hose.
• Manifold sets should be 750 psig high -side and 200 psig low -side with 520 psig low -side retard.
• Use hoses with 750 psig service pressure rating.
• Leak detectors should be designed to detect HFC refrigerant.
• R-410A, as with other HFC refrigerants, is only compatible with POE oils.
• POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
• POE oils may cause damage to certain plastics and roofing materials.
• Vacuum pumps will not remove moisture from oil.
• A liquid line filter -drier is required on every unit.
• Do not use liquid line filter -driers with rated working pressures less than 600 psig.
• Do not install a suction line filter -drier in liquid line.
• Wrap all filter -driers and service valves with wet cloth when brazing.
• Do not use with an R-22 TXV.
• If indoor unit is equipped with an R-22 TXV, it must be changed to an R-410A TXV.
• Do not use capillary tube indoor coils.
• Never open system to atmosphere while it is under a vacuum.
• When system must be opened for service, break vacuum with dry nitrogen and replace all filter -driers.
• Do not vent R-410A into the atmosphere.
• Observe all WARNINGS, CAUTIONS, NOTES, and bold text.
Copyright 2016 International Comfort Products
18 496 01 5402 04
Lewisburg, TN 37091 USA