StandoffFilter Rack
Using Optional
Standoff Filter
Rack
25-21-45a
Note: The three(3) screws in the top panel of the furnace next to
the duct flange MUST be removed to provide serviceability of the
primary heat exchangers in the downflow installation
1. Position plenum through the floor and set the furnace over
the opening in the floor. If necessary, grout around the base
to seal air leaks between the base and the floor.
CombustibleFloor Installation
Fire Hazard.
Place furnace on noncombustible subbase on
downflow applications, unless installing on
non-combustible flooring.
Failure to install unit on noncombustible
subbase can result in death, personal injury
and/or property damage.
CAUTION
If filters are only suitable for heating application,
advise homeowner that filter size may need to be
increased if air conditioning is added.
Addition Of Air Conditioning
When a refrigeration coil is used in conjunction with this unit, it
must be installed on the discharge side of the unit to avoid con-
densation on the heat exchanger. The coi! installation instructions
must be consulted for proper coil location and installation proce-
dures. With a parallel flow arrangement, dampers must be
installed to prevent chilled air from entering the furnace. If manu-
ally operated dampers are used, they must be equipped with a
means to prevent operation of either unit unless the damper is in
full heat or full cool position.
A 3" clearance is required on the right side of the furnace in order
to run the condensate drain line. Copper, iron or plastic tubing
may be used for the condensate drain line.
DownflowFurnaceInstallation
Non-Combustible FloorInstallation
Fabricate a plenum to the dimensions given in Figure 3, for the
furnace outlet. Plenum should be flanged, approximately 3/4" for
support.
Subbase for Combustible Floor
NOTE: The three(3) screws in the top panel of the furnace next to
the duct flange MUST be removed to provide serviceability of the
primary heat exchangers in the downflow installation
Note: When using the subbase for combustible floors, the dis-
charge air duct flanges on the furnace MUST be broken down to
provide proper fit up to the subbase. Use duct pliers to bend the
duct flanges flat onto the furnace casing. DO NOT bend the duct
flanges inward (toward the heat exchangers) as air flow restric-
tions may occur.
The Subbase for Combustible Floors MUST be used when a
downflow furnace is set on a combustible floor, even when the fur-
nace is installed on a coil box.
Cut the opening in the floor according to Table 8. The hole
in the floor must be cut to the dimensions listed in Table 8
since the base is equipped with locating tabs that center
the base over the opening.
The opening in the base is 1t/4" shorter and 11/8" narrower than
the recommended size of the opening in the floor. This is done to
maintain clearance between the floor and the plenum.
2. Fabricate the plenum to the dimensions given in Table 8.
Note that the dimensions given are outside dimensions.
440 01 101004 E_
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