DMS FX4C User manual

FX4C
FY4A
Installation Instructions
Direct Expansion Fan Coil Units
For PuronrRefrigerant
Sizes 018 To 060
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1.......................
INTRODUCTION 1.................................
HEATER PACKAGES 1.............................
INSTALLATION 1..................................
Check Equipment 1................................
Mount Unit 2.....................................
Air Ducts 6......................................
Electrical Connections 6............................
Refrigerant Tubing Connection and Evacuation 10........
Refrigerant Flow--Control Device 10...................
Condensate Drains 10..............................
Accessories 11....................................
Sequence of Operation 13...........................
START--UP PROCEDURES 13........................
CARE AND MAINTENANCE 13......................
PURONR(R--410A) QUICK REFERENCE GUIDE 14.....
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
. When you see this symbol on the unit and in instruction
manuals, be alert to 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 may result in minor personal injury or product and
property damage. NOTE is used to highlight suggestions which
will result in enhanced installation, reliability, or operation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
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.
!WARNING
INTRODUCTION
Models FX4C and FY4A 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 designed specifically for Puronrrefrigerant and must be
used only with Puronrrefrigerant air conditioners and heat
pumps as shipped. These units are available for systems of
18,000 through 60,000 Btuh nominal cooling capacity.
Factory--authorized, field--installed electric heater packages are
available in sizes 5 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 differences is not an error
and is due to calculation difference per UL guidelines.
INSTALLATION
Step 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.

2
ACOIL
UNITS
POWER ENTRY
OPTIONS
LOW VOLT
ENTRY
OPTIONS
FIELD MODIFIED
SIDE RETURN
LOCATION FOR
SLOPE COIL
UNITS ONLY
FIELD SUPPLIED
RETURN PLENUM
UPFLOW/DOWNFLOW
SECONDARY DRAIN
UPFLOW/DOWNFLOW
PRIMARY DRAIN
UNIT
018
024/030
A
12 In.
17 In.
A
11/2”
21/2”
19”
FIELD SUPPLIED
SUPPLY DUCT
21--IN. FRONT SERVICE
CLEARANCE
UPFLOW/DOWNFLOW
SECONDARY DRAIN
UPFLOW/DOWNFLOW
PRIMARY DRAIN
018--048
060 24--IN.
036 19 In.
A05170
Fig. 1 -- Slope Coil Unit in Upflow Application
Step 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.
B. Downflow Installation
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.
UNIT 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 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.
CAUTION
!
C. Horizontal Installation
Units must not be installed with access panels facing up or down.
All other units are factory built for horizontal left installation.
(See Fig. 2 and 3.) When suspending unit from ceiling, dimples
in casing indicate suitable location of screws for mounting metal
support straps. (See Fig. 2.)
For horizontal applications having high return static and humid
return air, the Water Management Kit, KFAHC0125AAA, may
need to be used to assist in water management.
FX4C / FY4A

3
UNIT
FIELD
SUPPLIED
HANGING
STRAPS
LOW VOLT
ENTRY
OPTIONS
POWER
ENTRY OPTIONS
SECONDARY
DRAIN
018--048 21--IN.
060 24--IN.
FRONT SERVICE
CLEARANCE
(FULL FACE
OF UNIT)
SECONDARY
DRAIN
A--COIL
HORIZONTAL LEFT
PRIMARY
DRAIN
PRIMARY
DRAIN
13/4 IN.
FILTER ACCESS
CLEARANCE
A05173
Fig. 2 -- Slope Coil Unit in Horizontal Left Application
A
B
C
FACTORY SHIPPED
HORIZONTAL LEFT
APPLICATION
AIR SEAL
ASSEMBLY
HORIZONTAL
DRAIN PAN
REFRIGERANT
CONNECTIONS
SECONDARY DRAIN
HORIZONTAL LEFT
PRIMARY DRAIN
HORIZONTAL LEFT
COIL
SUPPORT
RAIL
COIL
BRACKET
DRAIN PAN
SUPPORT
BRACKET
COIL
BRACKET
A00072
Fig. 3 -- A--Coil in Horizontal Left Application (Factory Ready)
FX4C / FY4A

4
2 SCREWS
2 SCREWS
REAR CORNER
BRACKET
BLOWER BOX
COIL BOX
2 SCREWS
A95293
Fig. 4 -- Removal of Brackets on Modular Units
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
For optimum condensate drainage performance in
horizontal installations, unit should be leveled along its
length and width.
CAUTION
!
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. 4.)
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. 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. (See Fig. 5.)
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. 6.)
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.(SeeFig.6.)
b. Remove air splitter (B) from coil seal assembly by
removing 3 screws. (See Fig. 6--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.
10. Remove two oval fitting caps from the left side of the coil
door 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 item 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.
14. 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.
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--in. 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
andtowallstudusing5/16--in.lagscrews.(SeeFig.
7.)
FX4C / FY4A

5
COIL MOUNTING
SCREW BLOWER
ASSEMBLY
REFRIGERANT
CONNECTIONS
SECONDARY DRAIN
PRIMARY DRAIN
DRAINPAN
SLOPE COIL
SKI
COIL
SUPPORT
RAIL
A03001
Fig. 5 -- Conversion for Horizontal Right Applications Using a Slope Coil
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 AIR SEAL
ASSEMBLY
A
B
C
HORIZONTAL
RIGHT
APPLICATION
A00071
Fig. 6 -- Conversion for Horizontal Right Applications Using A--Coil
FX4C / FY4A

6
DOWN FLOW
BASE KIT (KFACB)
UNIT AGAINST WALL
1/8--IN. THICK ANGLE
MOUNTING BRACKET
(TYPICAL BOTH SIDES)
SECURE FAN COIL TO STRUCTURE
UNIT AWAY FROM WALL
PIPE STRAP
(TYPICAL BOTH SIDES)
OR
SECURE UNIT TO FLOOR
ANGLE BRACKET OR PIPE STRAP
4” MAX
4” MAX
A02003
Fig. 7 -- A--Coil
Step 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.
Step 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 and 9.)
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.
®
®
CPC--E
94V--0
LR40061
HSCI
5AMP
C
T
G
R
SPT
K1
U1
R7
R9
R10
C8
C7
R2
R3
C3
R6
R11
C4
C6
C5
R8
R5
R4
Q1
C1C2
F1
JW1
R1
Z1
D2
D1
NO
NC
FAN
RELAY
C
C
A03010
Fig. 8 -- Fan Coil Printed Circuit Board for FY4A Model
A05181
Fig. 9 -- Fan Coil Printed Circuit Board
for FX4C Model
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
If a disconnect switch is to be mounted on unit, select a
location where drill or fastener will not contact electrical or
refrigerant components.
CAUTION
!
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
FX4C / FY4A

7
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.
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.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
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
cannot be performed until the main disconnect switch
(remote to the unit) is turned off.
!WARNING
A. Line Voltage Connections
If unit will contain accessory electric heater, remove and discard
power plug from fan coil and connect male plug from heater to
female plug from unit wiring harness. (See Electric Heater
Installation Instructions.)
For units without electric heater:
1. Connect 208/230v power leads from field disconnect to
yellow and black stripped leads.
2. Connect ground wire to unit ground lug.
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. 10 through 15.) 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. 16.)
Heater Staging
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
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. KHOT0201SEC
and is normally used with kit Part No. KHAOT0301FST
for 2 outdoor thermostat systems.
CAUTION
!
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. 13.) 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.
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_F, except for a heat pump defrost cycle. Refer to Fig.
15 for typical low voltage wiring with outdoor thermostat.
D. Ground Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
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.
!WARNING
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.
FY4A 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. 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.
Most units have 3 motor speed taps. Low speed (red) is designed
for mismatched 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.
The fan speed selection on the FX4C models is done at the motor.
To change motor speeds, disconnect fan lead from terminal 2 and
move to desired speed tap; Low speed (one), Medium (two), and
High (three).
FX4C / FY4A

8
R
G
W
Y
THERMOSTAT
RED
GRY
WHT
BLU
VIO
BRN
WHT
R
G
W2
W3
E
C
FAN COIL
(CONTROL)
C
Y
AIR COND.
A94058
Fig. 10 -- Wiring Layout Air Conditioning Unit
(Cooling Only)
R
G
W
Y
THERMOSTAT
R
G
W2
W3
E
C
FAN COIL
(CONTROL)
C
Y
AIR COND.
RED
GRY
WHT
WHT
BLU
VIO
BRN
A94059
Fig. 11 -- Wiring Layout Air Conditioning Unit
(Cooling and 1--Stage Heat)
R
G
C
E
L
O
Y
THERMOSTAT
RR
C
O
Y
G
C
W2
W2
W2
W3
E
FAN COIL
(CONTROL) HEAT PUMP
(CONTROL)
RED
GRY
BRN
WHT
BLU
VIO
A94060
Fig. 12 -- Wiring Layout Heat Pump Unit
(Cooling and 2--Stage Heat with
No Outdoor Thermostat)
R
G
C
E
L
O
Y
THERMOSTAT
RR
C
O
Y
G
C
W2
W2
W2
W3
E
ODTS
FAN COIL
(CONTROL) HEAT PUMP
(CONTROL)
RED
GRY
BRN
WHT
VIO
BLU
A94061
Fig. 13 -- Wiring Layout Heat Pump Unit
(Cooling and 2--Stage Heat with
1 Outdoor Thermostat)
R
G
C
L
E
O
C147C96 3
Y
THERMOSTAT
RR
C
O
Y
G
C
W2W2
W2
W3
E
FAN COIL
(CONTROL)
EMERGENCY HEAT RELAY
HEAT PUMP
(CONTROL)
ODTS1
ODTS2
RED
GRY
BRN
WHT
BLU
VIO
A94062
Fig. 14 -- Wiring Layout Heat Pump Unit
(Cooling and 2--Stage Heat with 2
Outdoor Thermostats)
FX4C / FY4A

9
R
E
W2
R
C
THERMOSTAT FAN COIL
(CONTROL) HEAT PUMP
(CONTROL)
G
C
W2
E
L
G
C
R
O
Y
ODTS
O
Y
W3
W2
A03088
Fig. 15 -- Wiring Layout Heat Pump Unit
(Cooling and 2--Stage Heat for Manufactured Housing)
230
C
208
BRN
RED
YEL
BLK
SECONDARY
PRIMARY
A01050
Fig. 16 -- Transformer Connections
FX4C / FY4A

10
INSULATING CAP (2)
MOTOR SPEED
TAP LEADS
COMMON YELLOW
FAN DECK
WRAPPER
SPEED TAP
TERMINAL
PCB
FAN RELAY
SINGLE SPADE
A97529
Fig. 17 -- Fan Coil Relay and Speed Tap Terminal for FY4A Models
Step 5—Refrigerant Tubing Connection and
Evacuation
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.
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
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.
CAUTION
!
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.
4. Evacuate coil and tubing system to 500 microns using
deep vacuum method.
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
Wrap a wet cloth around rear of fitting to prevent damage to
TXV and factory--made joints.
CAUTION
!
Step 6—Refrigerant Flow--Control Device
The FX4C and FY4A are equipped with PuronRrefrigerant
TXV. Use outdoor units designed for PuronRrefrigerant only.
PRODUCT OPERATION HAZARD
Failure to follow this caution may result in improper
product operation.
If using a TXV 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 number.
CAUTION
!
Step 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.
FX4C / FY4A

11
UNIT 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 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.
CAUTION
!
Units are equipped with primary and secondary 3/4--in. FPT drain
connections. For proper condensate line installations see Fig. 1, 2,
3, 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 and 20.) 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.
2” MIN
(51 mm)
UNIT
2” MIN
(51 mm)
A03002
Fig. 18 -- Recommended Condensate Trap
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
Shallow running traps are inadequate and DO NOT allow
proper condensate drainage. (See Fig. 19.)
CAUTION
!
DO NOT USE SHALLOW RUNNING TRAPS!
A03013
Fig. 19 -- Insufficient Condensate Trap
NOTE: When connecting condensate drain lines, avoid blocking
filter access panel, thus preventing filter removal. After
connection, prime both primary and secondary condensate traps.
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.
Step 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.
FX4C / FY4A

12
FILTER
ACCESS
PANEL
SECONDARY DRAIN WITH
APPROPRIATE TRAP REQUIRED
(USE FACTORY KIT OR
FIELD--SUPPLIED TRAP)
PRIMARY TRAP REQUIRED
(USE FACTORY KIT OR
FIELD--SUPPLIED TRAP OF
SUFFICIENT DEPTH.
STANDARD P--TRAPS ARE
NOT SUFFICIENT. SEE
FIGURE OF RECOMMENDED
CONDENSATE TRAP)
A03003
Fig. 20 -- Condensate Trap and Unit
R
FAN R ELAY
NO
230VAC
COM
NC
NONCSPT
WIRE
NUT
TO
BLOWER
MOTOR
CONVERSION KIT
TRANSFORMER
FROM MOLEX
PLUG AND
TRANSFORMER
(IN UNIT)
TO EAC
208/230VAC COM
24VAC
COM 208/
230
COM
CONTROL BOARD
GTC
C C
A03011
Fig. 21 -- Wiring Layout of Electronic Air Cleaner to Fan
Coil for FY4A Models Only
R
G
C
E
L
O
Y
THERMOSTAT
RR
C
O
Y
G
C
W2
W2
W2
W3
E
FAN COIL
(CONTROL) HEAT PUMP
(CONTROL)
RED
GRY
BRN
WHT
WHT BLU
VIO
HUMIDISTAT
RELAY
FAN HUMIDIFIER
115V M
A95294
Fig. 22 -- Wiring Layout of Humidifier to Heat Pump
FX4C / FY4A

13
R
G
W
Y
THERMOSTAT
R
G
W2
W3
E
C
FAN COIL
(CONTROL)
C
Y
AIR COND.
HUMIDISTAT
FAN HUMIDIFIER
115V
RED
GRY
WHT
WHT
BLU
VIO
BRN
M
A95295
Fig. 23 -- Wiring Layout of Humidifier to Fan Coil With Electric Heat
Step 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 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.
D. 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.
UNIT COMPONENT HAZARD
Failure to follow this caution may result in product damage.
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.
CAUTION
!
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.
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 is filter replacement or cleaning
on a monthly basis.
FX4C / FY4A

14
PURONRREFRIGERANT (R--410A) QUICK REFERENCE GUIDE
SPuronrrefrigerant operates at 50--70 percent higher pressures than R--22. Be sure that servicing equipment and replacement components
are designed to operate with Puronr.
SPuronrrefrigerant cylinders are rose colored.
SRecovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
SPuronrsystems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose when charging
into suction line with compressor operating.
SManifold sets should be 700 psig high side and 180 psig low side with 550 psig low--side retard.
SUse hoses with 700 psig service pressure rating.
SLeak detectors should be designed to detect HFC refrigerant.
SPuronr, as with other HFCs, is only compatible with POE oils.
SVacuum pumps will not remove moisture from oil.
SDo not use liquid--line filter driers with rated working pressures less than 600 psig.
SDo not leave Puronrsuction line filter driers in line longer than 72 hours.
SDo not install a suction--line filter drier in liquid line.
SPOE oils absorb moisture rapidly. Do not expose oil to atmosphere.
SPOE oils may cause damage to certain plastics and roofing materials.
SWrap all filter driers and service valves with wet cloth when brazing.
SA factory approved liquid--line filter drier is required on every unit.
SDo NOT use an R--22 TXV.
SIf indoor unit is equipped with an R--22 TXV or piston metering device, it must be changed to a hard shutoff PuronrTXV.
SNever open system to atmosphere while it is under a vacuum.
SWhen system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter driers.
Evacuate to 500 microns prior to recharging.
SDo not vent Puronrinto the atmosphere.
SDo not use capillary tube coils.
SObserve all warnings, cautions, and bold text.
SAll indoor coils must be installed with a hard shutoff PuronRTXV metering device.
Copyright 2006 CAC / BDP S7310 W. Morris St. SIndianapolis, IN 46231
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: I M --- F X 4 C --- 0 2
Replaces: I M -- F X 4 C -- 0 1
Printed in U.S.A. Edition Date: 08/06
FX4C / FY4A