Installation Instructions
Direct Expansion Fan Coil Units
Fan Unit
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 the 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
to the potential for personal injury.
Understand the signal words DANGER, WARNING, and CAUTION. 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 would 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.
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.
. When you see this symbol on the unit and in instructions or manuals, be alert
FA4A, FB4A, FC4B
FH4A
INTRODUCTION
Models FA4A, FB4A, FC4B, and FH4A are designed for flexibility and can be used for upflow, horizontal, or downflow (kit required)
applications. These units are available for systems of 24,000 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. Some units have a factory supplied 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—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 coil is required, using accessory downflow kit, along with an accessory base kit. See
installation instructions packaged with accessory kits.
C. Horizontal Installation
Units must not be installed with access panels facing up or down. The FH4A003 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 Figs. 2 and 6.) When suspending unit
from ceiling, dimples in casing indicate suitable location of screws for mounting metal support straps. (See Fig. 2.)
Form: IM-FA4A-10 Cancels: IM-FA4A-09 Printed in U.S.A. 6-00 Catalog No. 63FA-4A5
POWER ENTRY
OPTIONS
FIELD SUPPLIED
SUPPLY DUCT
LOW VOLT
ENTRY
OPTIONS
018-060
070 24-IN.
UPFLOW/DOWNFLOW
SECONDARY DRAIN
UPFLOW/DOWNFLOW
21-IN. FRONT SERVICE
A COIL
UNITS
PRIMARY DRAIN
UPFLOW/DOWNFLOW
SECONDARY DRAIN
UPFLOW/DOWNFLOW
PRIMARY DRAIN
CLEARANCE
018/024
030/036
1 1⁄2″
19
1
⁄2″
2
→ Fig. 1—Slope Coil Unit in Upflow Application
UNIT
042 19 In.
″
A
A
12 In.
17 In.
FIELD MODIFIED
SIDE RETURN
LOCATION FOR
SLOPE COIL
UNITS ONLY
FIELD SUPPLIED
RETURN PLENUM
A00069
CAUTION: For optimum condensate drainage performance in horizontal installations, unit should be leveled along its
length and width.
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: The TXV sensing bulb must be insulated on slope coils in horizontal right and downflow applications. Failure to insulate bulb will result
in performance loss.
1. Remove blower and coil access panels and fitting panel. (See Fig. 4.)
2. Remove coil mounting screw securing coil assembly to right-side casing flange.
3. Remove coil assembly.
4. On FC4 insulate TXV sensing bulb with cork tape or other permanent insulating material. (See Fig. 4.)
5. Lay fan coil unit on its right side and reinstall coil assembly with condensate pan down. (See Fig. 4.)
6. Attach coil to casing flange using coil mounting screw previously removed.
7. 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-COIL
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.)
—2—
A-COIL
HORIZONTAL LEFT
LOW VOLT
ENTRY
OPTIONS
POWER
ENTRY OPTIONS
FIELD
SUPPLIED
HANGING
STRAPS
UNIT
SECONDARY
DRAIN
PRIMARY
DRAIN
SECONDARY
DRAIN
→ Fig. 2—Slope Coil Unit in Horizontal Left Application
PRIMARY
DRAIN
018-060 21-IN.
070 24-IN.
FRONT SERVICE
CLEARANCE
(FULL FACE
OF UNIT)
1 3/4 IN.
FILTER ACCESS
CLEARANCE
A00070
BLOWER BOX
2 SCREWS
2 SCREWS
REAR CORNER
BRACKET
2 SCREWS
COIL BOX
Fig. 3—Removal of Brackets on Modular Unit
—3—
A95293
COIL
SUPPORT
RAIL
COIL MOUNTING
SCREW
BLOWER
ASSEMBLY
SLOPE COIL
SKI
DRAINPAN
COIL
SUPPORT
RAIL
COIL
BRACKET
REFRIGERANT
CONNECTIONS
PRIMARY DRAIN
OVERFLOW HOLE
SECONDARY DRAIN
Fig. 4—Conversion for Horizontal Right Applications Using a Slope Coil
A
REFRIGERANT
CONNECTIONS
AIR SEAL
ASSEMBLY
B
C
TXV SENSING
BULB MUST BE
INSULATED
A99033
HORIZONTAL
RIGHT
APPLICATION
DRAIN PAN
SUPPORT
BRACKET
COIL
SUPPORT
RAIL
COIL
BRACKET
HORIZONTAL
DRAIN PAN
PRIMARY DRAIN
HORIZONTAL RIGHT
SECONDARY DRAIN
HORIZONTAL RIGHT
→ Fig. 5—Conversion for Horizontal Right Applications Using A-Coil
A00071
—4—
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