Instruction manual

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 along with an accessory base kit. Refer to Table 1 for kit part numbers.
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. 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 he leveled along its
length or raised 1/4 in. at the air inlet. The unit should also be pitched forward 1/4 in. to 1/2 in. toward the front condensate
drains.
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
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. 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. 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.
Fig. 1—Slope Coil Unit in Upflow Application
A91424
A-COIL
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
030/036
A
12 In.
17 In.
042 19 In.
A
1
1
⁄
2
″
2
1
⁄
2
″
19″
FIELD SUPPLIED
SUPPLY DUCT
24-IN. FRONT SERVICE
CLEARANCE
UPFLOW/DOWNFLOW
SECONDARY DRAIN
UPFLOW/DOWNFLOW
PRIMARY DRAIN
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