Fan Coil Units
FA4B, FB4B, FC4C
FH4B
NOTE: Read the entire instruction manual before starting the installation.
This symbol → indicates a change since the last issue.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may
cause personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance.
The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions
packaged with kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read
these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes and National Electrical Code
(NEC) for special requirements.
Recognize safety information. This is the safety-alert symbol
the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert symbol. DANGER
identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal
injury or death. CAUTION is used to identify unsafe practices which wouldresult inminorpersonalinjuryorproductandpropertydamage.NOTE
is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
. When you see this symbol on the unit and in instructions manuals, be alert to
WARNING: Before installing or servicing unit, always turn off all power to unit. There may be more than 1 disconnect
switch. Turn off accessory heater power if applicable. Electrical shock can cause personal injury or death.
INTRODUCTION
Models FA4B, FB4B, FC4C, and FH4B are designed for flexibility and can be used for upflow, horizontal, or downflow (kit required and
manufactured and mobile home) applications. These units are designed to meet the low air leak requirements currently in effect. Because of this,
the units need special attention in the condensate pan and drain connection area and when brazing tubing. These units are available for systems
of 18,000 through 60,000 Btuh nominal cooling capacity. Factory authorized electric heater packages are available in sizes 3 through 30kw. See
Product Data Literature for available accessory kits.
HEATER PACKAGES
This unit may or may not be equipped with an electric heater package. For units not equipped with factory installed heat, a factory approved, field
installed UL listed heater package is available from your 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. If fan coil contains a factory installed
heater package, minimum circuit ampacity (MCA) and maximum fuse/breaker may be different than units with a same size field installed accessory
heater. The difference is not an error and is due to calculation difference per UL guidelines.
INSTALLATION
PROCEDURE 1—CHECK EQUIPMENT
Unpack unit and move to final location. Remove carton taking care not to damage unit.
Inspect equipment for damage prior to installation. File claim with shipping company if shipment is damaged or incomplete. Locate unit rating
plate which contains proper installation information. Check rating plate to be sure unit matches job specifications.
PROCEDURE 2—MOUNT UNIT
Unit can stand or lie on floor, or hang from ceiling or wall. Allow space for wiring, piping, and servicing unit.
IMPORTANT: When unit is installed over a finished ceiling and/or living area, building codes may require a field-supplied secondary condensate
pan to be installed under the entire unit. Some localities may allow as an alternative, the running of a separate, secondary condensate line. Consult
local codes for additional restrictions or precautions.
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-in. thick fireproof resilient gasket between duct,
unit, and floor.
Side return is a field option on slope coil models. Cut opening per dimensions. (See Fig. 1.) A field-supplied bottom closure is required.
Form: IM-FA4B-02 Cancels: IM-FA4B-01 Printed in U.S.A. 6-03 Catalog No. 63FA-4B1
POWER ENTRY
OPTIONS
FIELD SUPPLIED
SUPPLY DUCT
LOW VOLT
ENTRY
OPTIONS
018-060
070 24-IN.
UPFLOW/DOWNFLOW
SECONDARY DRAIN
UPFLOW/DOWNFLOW
PRIMARY DRAIN
B. Downflow Installation
21-IN. FRONT SERVICE
CLEARANCE
A COIL
UNITS
UPFLOW/DOWNFLOW
SECONDARY DRAIN
UPFLOW/DOWNFLOW
PRIMARY DRAIN
Fig. 1—Slope Coil Unit in Upflow Application
UNIT
018/024
030/036
042 19 In.
1
1
⁄2″
19″
1
2
⁄2″
A
12 In.
17 In.
FIELD MODIFIED
SIDE RETURN
A
LOCATION FOR
SLOPE COIL
UNITS ONLY
FIELD SUPPLIED
RETURN PLENUM
A00069
CAUTION: The conversion of the fan coil to downflow requires special procedures for the condensate drains on both
A-coil and Slope units. The vertical drains have an overflow hole between the primary and secondary drain holes. This hole
is plugged for all applications except downflow, but must be used for downflow. During the conversion process, remove the
plastic cap covering the vertical drains only and discard. Remove the plug from the overflow hole and discard. At completion
of the downflow installation, caulk around the vertical pan fitting to door joint to retain the low air leak performance of the
unit. Failure to follow this CAUTION could result in minor personal injury or product and property damage.
In this application, field conversion of the evaporator is required using accessory downflow kit along with an accessory base kit. Use fireproof
resilient gasket, 1/8- to 1/4-in. thick, between duct, unit, and floor.
NOTE: To convert units for downflow applications, refer to Installation Instructions supplied with kit for proper installation. For slope fan coils,
use kit Part No. KFADC0201SLP. For A-coils, use kit Part No. KFADC0401ACL. Use fireproof resilient gasket, 1/8- to 1/4-in. thick, between
duct, unit, and floor.
NOTE: Gasket kit number KFAHD0101SLP is also required for all downflow applications to maintain low air leak/low sweat performance.
C. Horizontal Installation
Units must not be installed with access panels facing up or down. The FH4B003 and 004 size units equipped with accessory cooling coils are not
approved for horizontal applications. All other units are factory built for horizontal left installation. (See Fig. 2 and 6.) When suspending unit from
ceiling, dimples in casing indicate suitable location of screws for mounting metal support straps. (See Fig. 2.)
CAUTION: For optimum condensate drainage performance in horizontal installations, unit should be leveled along its
length and width. Failure to follow this CAUTION could result in minor personal injury or product and property damage.
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. (See Fig. 3.)
HORIZONTAL RIGHT CONVERSION OF UNITS WITH SLOPE COILS
NOTE: Gasket kit number KFAHD0101SLP is required for horizontal slope coil conversion to maintain low air leak/low sweat performance.
1. Remove blower and coil access panel and fitting panel. (See Fig. 4.)
2. Remove coil mounting screw securing coil assembly to right side casing flange.
3. Remove coil assembly.
—2—
A-COIL
HORIZONTAL LEFT
PRIMARY
DRAIN
LOW VOLT
ENTRY
OPTIONS
POWER
ENTRY OPTIONS
FIELD
SUPPLIED
HANGING
STRAPS
UNIT
SECONDARY
DRAIN
PRIMARY
DRAIN
SECONDARY
DRAIN
018-060 21-IN.
070 24-IN.
FRONT SERVICE
CLEARANCE
(FULL FACE
OF UNIT)
1 3/4 IN.
FILTER ACCESS
CLEARANCE
Fig. 2—Slope Coil Unit in Horizontal Left Application
4. Lay fan coil unit on its right side and reinstall coil assembly with condensate pan down. (See Fig. 4.)
5. Attach coil to casing flange using coil mounting screw previously removed.
6. Make sure the pan cap in the fitting door is properly seated on the fitting door to retain the low air leak rating of the unit.
7. Add gaskets from kit KFAHD per kit instructions.
8. Align holes with tubing connections and condensate pan connections, and reinstall access panels and fitting panel.
Make sure liquid and suction tube grommets are in place to prevent air leaks and cabinet sweating. Install after brazing.
HORIZONTAL RIGHT CONVERSION OF UNITS WITH A-COILS
1. Remove blower and coil access panels. (See Fig. 5.)
2. Remove metal clip securing fitting panel to condensate pan. Remove fitting panel.
3. Remove 2 snap-in clips securing A-coil in unit.
4. Slide coil and pan assembly out of unit.
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.
a. Remove air-seal assembly from coil by removing 4 screws. (See Fig. 5.)
b. Remove air splitter (B) from coil seal assembly by removing 3 screws. (See Fig. 5—factory shipped inset.)
c. Remove filter plate (A) and install air splitter (B) in place of filter plate.
d. Install filter 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.
A00070
—3—
BLOWER BOX
2 SCREWS
2 SCREWS
REAR CORNER
BRACKET
2 SCREWS
COIL BOX
Fig. 3—Removal of Brackets on Modular Units
A95293
COIL MOUNTING
SCREW
BLOWER
ASSEMBLY
COIL
SUPPORT
RAIL
SLOPE COIL
SKI
DRAINPAN
REFRIGERANT
PRIMARY DRAIN
CONNECTIONS
SECONDARY DRAIN
A03001
Fig. 4—Conversion for Horizontal Right Applications Using a Slope Coil
10. Remove two oval fitting caps from left side of the coil, access panel, and fitting panel.
11. Remove insulation knockouts on right side of coil access panel
12. Remove 2 oval coil access panel plugs and reinstall into holes on left side of coil access panel and fitting panel.
13. Install condensate pan fitting caps (from Step 10) in the right side of the coil door making sure that the cap snaps and seats cleanly on the
back side of the coil door. Make sure no insulation interferes with seating of the cap.
—4—
A
AIR SEAL
ASSEMBLY
B
C
HORIZONTAL
RIGHT
APPLICATION
A00071
COIL
SUPPORT
RAIL
COIL
BRACKET
DRAIN PAN
SUPPORT
BRACKET
COIL
SUPPORT
RAIL
COIL
BRACKET
HORIZONTAL
DRAIN PAN
PRIMARY DRAIN
HORIZONTAL RIGHT
SECONDARY DRAIN
HORIZONTAL RIGHT
REFRIGERANT
CONNECTIONS
Fig. 5—Conversion for Horizontal Right Applications Using A-Coil
14. Reinstall access and fitting panels, aligning holes with tubing connections and condensate pan connections. Be sure to reinstall metal clip
between fitting panel and vertical condensate pan.
Make sure liquid and suction tube grommets are in place to prevent air leaks and cabinet sweating.
D. Manufactured and Mobile Home Housing Applications
1. Fan coil unit must be secured to the structure using field-supplied hardware.
2. Allow a minimum of 24” 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-in. lag screws. Typical both sides of fan coil.
b. If fan coil is against wall, secure fan coil to wall stud using 1/8-in. thick right-angle brackets. Attach brackets to fan coil using No. 10
self tapping screws and to wall stud using 5/16-in. lag screws. (See Fig. 7.)
PROCEDURE 3—AIR DUCTS
Connect supply-air duct over the outside of 3/4-in. flanges provided on supply-air opening. Secure duct to flange, using proper fasteners for type
of duct used, and seal duct-to-unit joint. If return-air flanges are required, install factory-authorized accessory kit.
Use flexible connectors between ductwork and unit to prevent transmission of vibration. When electric heater is installed, use heat-resistant
material for flexible connector between ductwork and unit at discharge connection. Ductwork passing through unconditioned space must be
insulated and covered with vapor barrier.
Units equipped with 20-30kw electric heaters require a 1-in. clearance to combustible materials for the first 36 in. of supply duct.
Ductwork Acoustical Treatment
Metal duct systems that do not have a 90° elbow and 10 ft of main duct to first branch takeoff may require internal acoustical insulation lining.
As an alternative, fibrous ductwork 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 ductwork shall comply with National Fire Protection Association as tested by
UL Standard 181 for Class 1 air ducts.
PROCEDURE 4—ELECTRICAL CONNECTIONS
All products from the factory utilize a printed-circuit board (PCB) which has a low voltage circuit protective fuse (5 amp), fan motor speed tap
selection terminal (SPT), and time delay relay (TDR) jumper. To disable the TDR feature, sever the jumper wire JW1. (See Fig. 8.)
When a factory-approved accessory control package has been installed, check all factory wiring per unit wiring diagram and inspect factory wiring
connections to be sure none were loosened in transit or installation. If a different control package is required, see unit rating plate.
CAUTION: If a disconnect switch is to be mounted on unit, select a location where drill or fastener will not contact
electrical or refrigerant components. Failure to follow this CAUTION could result in minor personal injury or porduct and
property damage.
—5—
A
FACTORY SHIPPED
HORIZONTAL LEFT
APPLICATION
B
C
HORIZONTAL
DRAIN PAN
AIR SEAL
ASSEMBLY
REFRIGERANT
CONNECTIONS
Fig. 6—A-Coil in Horizontal Left Application (Factory Ready)
4” MAX
SECURE FAN COIL TO STRUCTURE
UNIT AWAY FROM WALL
PIPE STRAP
(TYPICAL BOTH SIDES)
OR
UNIT AGAINST WALL
1/8-IN. THICK ANGLE
MOUNTING BRACKET
(TYPICAL BOTH SIDES)
COIL
BRACKET
COIL
SUPPORT
RAIL
DRAIN PAN
SUPPORT
BRACKET
COIL
BRACKET
PRIMARY DRAIN
HORIZONTAL LEFT
SECONDARY DRAIN
HORIZONTAL LEFT
A00072
DOWN FLOW
BASE KIT (KFACB)
SECURE UNIT TO FLOOR
ANGLE BRACKET OR PIPE STRAP
4” MAX
A02003
Fig. 7—A-Coil
Before proceeding with electrical connections, make certain that supply voltage, frequency, phase, and ampacity are as specified on the unit rating
plate. See unit wiring label for proper field high- and low-voltage wiring. 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 a field-supplied disconnect switch located within sight from and readily accessible from
the unit.
—6—
C8
HSCI
C
C
C
T
G
R
F1
NC
5 AMP
JW1
FAN
NO
RELAY
SPT
A03010
C7
R2
R3
C3
R6
R11
Z1
R1
D2
D1
94V-0
CPC-E
R7
R8
C1C2
R10
R9
R5
R4
®
LR40061
C5
C6
U1
C4
®
K1
Q1
Fig. 8—Fan Coil Printed-Circuit Board
On units with a factory installed disconnect with pull-out removed, service and maintenance can be safely performed on only the load side of the
control package.
WARNING: Field wires on the line side of the disconnect found in the fan coil unit remain live, even when the pull-out
is removed. Service and maintenance to incoming wiring can not be performed until the main disconnect switch (remote to
the unit) is turned off. Failure to do so will result in electrical shock causing personal injury or death.
A. Line Voltage Connections
FA4B units installed without electric heat require the use of a factory-authorized Power Plug Kit (KFAPP0125PLG). This kit provides the electrical
connections necessary to supply the FA4B unit with 230-v power when electric heat is not present. This kit is required only on those FA4B
applications which do not use electric heat.
For units without electric heat:
1. Connect 208/230v power leads from field disconnect to yellow and black stripped leads.
2. Connect ground wire to unit ground lug.
3. If unit contains 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.)
NOTE: Units installed without electric heat should have a field-supplied sheet metal block-off plate covering the heater opening. This will reduce
air leakage and formation of exterior condensation.
B. 24-v Control System
CONNECTION TO UNIT
Wire low voltage in accordance with wiring label on the blower. (See Fig. 9, 10, 11, 12, and 14.) Use no. 18 AWG color-coded, insulated (35°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 ft from the unit (as measured along the low-voltage wire), use No. 16 AWG color-coded, insulated (35°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 any additional wiring procedure recommendations.
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 (See Fig. 15).
HEATER STAGING
CAUTION: 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. This relay is in kit Part No. KHAOT0201SEC and is
normally used with kit Part No. KHAOT0301FST for 2 outdoor thermostat system. Failure to follow this CAUTION could result
in minor personal injury or product and property damage.
The controls are factory circuited for single-stage operation. For 2-stage operation, use outdoor thermostat kit Part No. KHAOT0301FST, and for
3-stage use both kits Part No. KHAOT0201SEC and KHAOT0301FST.
When 2 stages are desired, cut W3 at the W2 wire nut, strip and reconnect per the thermostat kit instruction. (See Fig. 12.) When 3 stages are
desired, cut the W2 wire nut off and discard. Strip W2, W3, and E and reconnect per thermostat kit instructions (See Fig. 14).
NOTE: When 3 stages are used or anytime the E terminal is not tied to W2, the emergency heat relay, part of outdoor kit Part No.
KHAOT0201SEC must be used.
—7—
THERMOSTAT
FAN COIL
(CONTROL)
WHT
RED
GRY
WHT
BLU
VIO
BRN
R
G
W
2
W
3
E
C
R
G
W
Y
Fig. 9—Wiring Layout Air Conditioning Unit
(Cooling Only)
RED
GRY
WHT
BLU
VIO
BRN
FAN COIL
(CONTROL)
R
G
W
2
W
3
E
C
THERMOSTAT
R
G
W
WHT
AIR COND.
C
Y
A94058
AIR COND.
C
Y
Y
Fig. 10—Wiring Layout Air Conditioning Unit
(Cooling and 1-Stage Heat)
C. Manufactured Housing
→
In Manufactured Housing applications, the Code of Federal Regulations, Title 24, Chapter XX, Part 3280.714 requires that supplemental electric
heat be locked out at outdoor temperatures above 40 degrees F., except for a heat pump defrost cycle. Refer to Fig. 13 for typical low voltage wiring
with outdoor thermostat.
D. Ground Connections
WARNING:
According to NEC, ANSI/NFPA 70, and local codes, the cabinet must have an uninterrupted or unbroken
ground to minimize personal injury 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. Failure to follow this warning could result in electric shock, fire, or death.
NOTE: Use UL-listed conduit and conduit connector for connecting supply wire(s) to unit to obtain proper grounding. Grounding may also be
accomplished by using grounding lugs provided in control box.
E. 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.
Fan speed selection is done at the fan relay printed-circuit board. To change motor speeds, disconnect fan lead used on relay terminal (SPT) and
replace with motor speed tap desired. (See Fig. 16). 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 3 motor speed taps. Low speed (red) is designed for mismatch outdoor unit applications. Medium speed (blue) is designed for
straight matched operations. High speed (black) is used with high external static duct systems of straight matched systems.
A94059
—8—
THERMOSTAT
R
G
C
W
2
E
L
O
FAN COIL
(CONTROL)
RED
GRY
BRN
WHT
W
BLU
W
VIO
HEAT PUMP
(CONTROL)
R
G
C
2
3
E
R
C
W
2
O
Y
Y
Fig. 11—Wiring Layout Heat Pump Unit
(Cooling and 2-Stage Heat with No Outdoor Thermostat)
THERMOSTAT
R
G
C
W
2
E
L
O
Y
FAN COIL
(CONTROL)
RED
GRY
BRN
WHT
W
VIO
E
BLU
W
R
G
C
2
ODTS
3
HEAT PUMP
(CONTROL)
R
C
W
2
O
Y
Fig. 12—Wiring Layout Heat Pump Unit
(Cooling and 2-Stage Heat with 1 Outdoor Thermostat)
A94060
A94061
PROCEDURE 5—REFRIGERANT TUBING
Use accessory tubing package or field-supplied tubing of refrigerant grade. Suction tube must be insulated. Do not use damaged, dirty, or
contaminated tubing because it may plug refrigerant flow-control device. ALWAYS evacuate the coil and field-supplied tubing to 500 microns
before opening outdoor unit service valves.
CAUTION: A brazing shield MUST be used when tubing sets are being brazed to the unit connections to prevent
damage to the unit surface and condensate pan fitting caps. Failure to follow this CAUTION could result in minor personal
injury or product and property damage.
Units have sweat suction and liquid tube connections. Make suction tube connection first.
1. Cut tubing to correct length.
2. Insert tube into sweat connection on unit until it bottoms.
3. Braze connection using silver bearing or non-silver bearing brazing materials. Do not use solder (materials which melt below 800°F).
Consult local code requirements.
CAUTION: Wrap a wet cloth around rear of fitting to prevent damage to TXV and factory-made joints. Failure to follow
this CAUTION could result in minor personal injury or product and property damage.
—9—
THERMOSTAT
FAN COIL
(CONTROL)
HEAT PUMP
(CONTROL)
→
W2
W3
R
G
C
E
ODTS
R
G
C
W2
E
L
O
Y
Fig. 13—Wiring Layout Heat Pump Unit
(Cooling and 2-Stage Heat for Manufactured Housing)
THERMOSTAT
R
G
C
W
2
L
E
FAN COIL
(CONTROL)
RED
GRY
BRN
WHT
W
W
R
G
C
2
BLU
ODTS1
3
VIO
E
ODTS2
HEAT PUMP
(CONTROL)
R
C
W
2
R
C
W2
O
Y
A03088
O
Y
C147C963
EMERGENCY HEAT RELAY
O
Y
A94062
Fig. 14—Wiring Layout Heat Pump Unit
(Cooling and 2-Stage heat with 2 Outdoor Thermostats)
PROCEDURE 6—REFRIGERANT FLOW-CONTROL DEVICE
CAUTION:
If using a TXV (FC4C factory installed) in conjunction with a single-phase reciprocating compressor, a
compressor start capacitor and relay are required. Consult outdoor unit pre-sale literature for start assist kit part no.
Replace piston if required. Check piston size shown on indoor unit rating plate to see if it matches required piston shown on outdoor unit rating
plate. If it does not match, replace indoor piston with piston shipped with outdoor unit. The piston shipped with outdoor unit is correct for any
approved indoor coil combination (See Fig. 17). When changing piston, use a back-up wrench. Hand tighten hex nut, then tighten with wrench
1/2 turn. Do not exceed 30 ft-lbs.
PROCEDURE 7—CONDENSATE DRAINS
To connect drains, the cap openings must be removed. Use a knife to start the opening near the tab and using pliers, pull the tab to remove the
disk. Clean the edge of the opening if necessary and install the condensate line. Finally caulk around the lines where they exit the fitting to retain
the low leak rating of the unit.
—10—
SECONDARY
C
208
230
Fig. 15—Transformer Connections
PCB
FAN RELAY
SINGLE SPADE
BRN
RED
YEL
BLK
PRIMARY
A94067
INSULATING CAP (2)
MOTOR SPEED
TAP LEADS
COMMON YELLOW
SPEED TAP
TERMINAL
FAN DECK
WRAPPER
A97529
Fig. 16—Fan Coil Relay and Speed Tap Terminal
CAUTION: The conversion of the fan coil to downflow requires special procedures for the condensate drains on both
A-coil and Slope units. The vertical drains have an overflow hole between the primary and secondary drain holes. This hole
is plugged for all applications except downflow, but must be used for downflow. During the conversion process, remove the
plastic cap covering the vertical drains only and discard. Remove the plug from the overflow hole and discard. At completion
of the downflow installation, caulk around the vertical pan fitting to door joint to retain the low air leak performance of the
unit. Failur to follow this CAUTION could result in minor personal injury or product and property damage.
Units are equipped with primary and secondary 3/4-in. FPT drain connections. For proper condensate line installations see Fig. 1, 2, 4, 5, and 6.
To prevent property damage and achieve optimum drainage performance, BOTH primary and secondary drain lines should be installed and include
properly-sized condensate traps (See Fig. 18). Factory-approved condensate traps are available. It is recommended that PVC fittings be used on
the plastic condensate pan. Finger-tighten plus 1-1/2 turns. Do not over-tighten. Use pipe dope.
CAUTION: Shallow, running traps are inadequate and DO NOT allow proper condensate drainage. (See Fig. 19.)
Failure to follow this CAUTION could result in minor personal injury or product and property damage.
NOTE: When connecting condensate drain lines, avoid blocking filter access panel, thus preventing filter removal. After connection, prime both
primary and secondary condensate traps.
—11—
BRASS
HEX NUT
TEFLON SEAL
DISTRIBUTORPISTON
STRAINER
PISTON
RETAINER
BRASS
HEX BODY
Fig. 17—Refrigerant Flow-Control Device (FC4C has TXV and Strainer)
UNIT
2” MIN
A94415
2” MIN
A03002
Fig. 18—Recommended Condensate Trap
NOTE: If unit is located in or above a living space where damage may result from condensate overflow, a field-supplied, external condensate
pan should be installed underneath the entire unit, and a secondary condensate line (with appropriate trap) should be run from the unit into the
pan. Any condensate in this external condensate pan should be drained to a noticeable place. As an alternative to using an external condensate pan,
some localities may allow the use of a separate 3/4-in. condensate line (with appropriate trap) to a place where the condensate will be noticeable.
The owner of the structure must be informed that when condensate flows from the secondary drain or external condensate pan, the unit requires
servicing or water damage will occur.
Install traps in the condensate lines as close to the coil as possible. (See Fig. 20.) Make sure that the outlet of each trap is below its connection
to the condensate pan to prevent condensate from overflowing the drain pan. Prime all traps, test for leaks, and insulate traps if located above a
living area.
Condensate drain lines should be pitched downward at a minimum slop of 1 in. for every 10 ft of length.
Consult local codes for additional restrictions or precautions.
PROCEDURE 8—ACCESSORIES
A. Electronic Air Cleaner
The Electronic Air Cleaner may be connected to fan coil as shown in Fig. 21. This method requires a field supplied transformer. See Electronic
Air Cleaner literature for kit requirements.
B. Humidifier
Connect humidifier and humidistat to fan coil unit as shown in Fig. 22 and Fig. 23. The cooling lockout relay is optional (See Fig. 22.)
—12—
DO NOT USE SHALLOW RUNNING TRAPS!
Fig. 19—Insufficient Condensate Trap
PRIMARY TRAP REQUIRED
(USE FACTORY KIT OR
FIELD-SUPPLIED TRAP OF
SUFFICIENT DEPTH.
STANDARD P-TRAPS ARE
NOT SUFFICIENT. SEE
FIGURE OF RECOMMENDED
CONDENSA TE TRAP)
A03013
FILTER
ACCESS
PANEL
SECONDARY DRAIN WITH
APPROPRIATE TRAP REQ UIRED
(USE FACTORY KIT OR
FIELD-SUPPLIED TRAP)
A03003
Fig. 20—Condensate Trap and Unit
PROCEDURE 9—SEQUENCE OF OPERATION
A. Continuous Fan
Thermostat closes R to G. G energizes fan relay on PCB which completes circuit to indoor blower motor. When G is de-energized, there is a 90
sec 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 PCB which completes circuit to indoor blower motor.
When G is de-energized, there is a 90 sec delay before fan relay opens.
C. Heat Pump Heating Mode
Thermostat energizes R to G and R to Y. G energizes fan relay on PCB which completes circuit to indoor blower motor. When G is de-energized,
there is a 90 sec 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 sec 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 PROCEDURES
Refer to outdoor unit Installation Instructions for system start-up instructions and refrigerant charging method details.
—13—
230VAC
COM
NO
CONTROL BOARD
NC
RFAN RELAY
GTC
C C
WIRE
NUT
CONVERSION KIT
TRANSFORMER
TO
BLOWER
MOTOR
208/230VAC COM
NONCSPT
TO EAC
24VAC
COM 208/
FROM MOLEX
PLUG AND
TRANSFORMER
(IN UNIT)
COM
230
Fig. 21—Wiring Layout of Electronic Air Cleaner to Fan Coil
THERMOSTAT
R
G
C
W
2
E
L
O
WHT
FAN COIL
(CONTROL)
RED
GRY
BRN
WHT
BLU
VIO
R
G
C
W
2
W
3
E
HEAT PUMP
(CONTROL)
R
C
W
2
O
A03011
Y
FAN HUMIDIFIER
115V
M
RELAY
HUMIDISTAT
Y
A95294
Fig. 22—Wiring Layout of Humidifier to Heat Pump
CAUTION:
Never operate unit without a filter. Damage to blower motor or coil may result. 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. Failure to follow thid CAUTION could result in minor
personal injury or product and property damage.
CARE AND MAINTENANCE
To continue high performance and minimize possible equipment failure, it is essential that periodic maintenance be performed on this equipment.
Consult your local dealer as to the proper frequency of maintenance contract.
—14—
THERMOSTAT
FAN COIL
(CONTROL)
WHT
RED
GRY
WHT
BLU
VIO
BRN
R
G
W
2
W
3
E
C
AIR COND.
R
G
W
C
Y
Y
HUMIDISTAT
FAN HUMIDIFIER
115V
M
Fig. 23—Wiring Layout of Humidifier to Fan Coil
with Electric Heat
SPDT
24VAC COIL
230VAC 15A
A95295
COM
FAN RELAY
C
G
DEHUMIDISTAT
(OPENS ON RINSE)
TO
HIGH
SPEED
MOTOR
TO
LOW
SPEED
MOTOR
A03012
Fig. 24—Latent Capacity Control
The ability to properly perform maintenance on this equipment requires certain mechanical skills and tools. If you do not possess these, contact
your dealer for maintenance. The only consumer service recommended or required if filter replacement or cleaning on a monthly basis.
—15—
© 2003 CAC/BDP 7310 W. Morris St., Indianapolis, IN 46231 imfa4b02
—16—
Book/Tab: 1/4,3d/2e Catalog No. 63FA-4B1
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