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Install the conditioned air plenum, ducts and air filters (not
provided) in accordance with NFPA 90B Standard for the
Installation of Warm Air Heating and Air-Conditioning Systems
(latest edition).
The air handler is provided with flanges for the connection of the
plenum and ducts.
Air filters (not provided) must be listed as Class 2 furnace air
filters.
The air handler may be used with an optional modular evaporator
coil (WEM) in upflow, counterflow, or horizontal applications. See
“Installation Configuration Options” in “Installation
Configurations” for acceptable system configurations. The
mounting plates and the necessary hardware to connect the air
handler and modular evaporator coil cabinets together are
included with this air handler.
An optional electric heater may be installed in this cabinet. For
electric heater accessory, refer to the electric heater rating plate
for specific information regarding the electric supply.
Do not remove the cabinet knockouts until it has been
determined which knockouts will need to be removed for the
installation.
Select any accessories that are to be included in this installation.
Select the final installation position which best suits the site
conditions. Consider required clearances, space, routing
requirements for refrigerant line, condensate disposal, filters,
ductwork, wiring, and accessibility for service. Refer to the air
handler rating plate on the air handler for specific information.
Tools and Parts
Gather the required tools and parts before starting installation.
Read and follow the instructions provided with any tools listed
here.
Tools Needed
Parts Needed
Check local codes, check existing electrical supply, and read
“Ductwork Requirements,” and “Electrical Requirements,” before
purchasing parts.
Parts Supplied
The mounting plates and the necessary hardware to connect the
air handler and modular evaporator coil cabinets together are
included with the air handler.
Location Requirements
NOTE: When used on cooling applications, excessive sweating
may occur when the air handler with optional evaporator coil
(WEM) is installed in a very humid space.
■
If installed in an unconditioned space, sealant should be
applied around the electrical wires, refrigerant tubing, and
condensate lines where they enter the cabinet.
■
Electrical wires should be sealed on the inside where they exit
the conduit opening. Sealant is required to prevent air
leakage into and condensate from forming inside the air
handler, control box, and on electrical controls.
■
The air handler must be installed in such a way as to allow
free access to the optional coil/filter compartment and
blower/control compartment.
Installation Clearances
Non-Ducted Return Closet Installation
The air handler can be installed in a closet with a false bottom to
form a return air plenum, with a return air plenum through the wall
of the closet, with an air duct routed through the floor, or with
another approved method. Louvered closet doors or return air
grilles are field supplied. Local codes may limit application of
systems without a ducted return to single-story buildings.
■
Louvered closet doors shall be sized with the minimum
opening required to provide minimum return air free area. See
Minimum Filter Requirements Chart.
■
Louvers installed in a closet to provide return air shall be
sized with minimum opening required to provide minimum air
return free area. See Minimum Filter Requirements Chart.
■
Return air plenum installed through the floor shall be sized
with minimum opening required to provide minimum return
free area. See Minimum Filter Requirements Chart.
■
If the free area is not known, assume a 25% free area for
wood or a 75% free area for metal louvers or grilles.
■
If the return air plenum is used, the return air grille should be
immediately in front of the opening in the plenum to allow for
the free flow of return air.
■
When not installed in front of the opening, there must be
adequate clearance around the air handler to allow for the
free flow of return air.
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¹⁄₄
" nut driver
■
Level
■
Screwdriver
■
Adjustable wrench
■
Tape measure
■
Hammer
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Sealant
■
UL listed wire nuts
Explosion Hazard
Keep flammable materials and vapors, such as
gasoline, away from air handler.
Place air handler so that heating elements are at least
18 inches (46 cm) above the floor for a garage
installation.
Failure to follow these instructions can result in death,
explosion, or fire.
WARNING
Summary of Contents for WMB
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