3.
4.
Set the base overthe opening in the floor, centering the open-
ing in the base over the opening in the floor. Fasten the base
to the floor with screws or nails. See Figure 18 and
Figure 20.
Drop the plenum through the opening in the base. The flange
of the plenum should rest on top of the combustible floor
base.
Exploded View of Sub-Base
Figure 18 for Furnace ONLY
Sub-base for Combustible Floors- Downflow Coil
Box
The Subbase for Combustible Floors MUST be used when a
downflow furnace, used with a downflow coil box, is set on
combustible flooring.
NOTE: Supply opening is 37/8" from the rear of the furnace.
Therefore maintain a 37/8" clearance from wall (where applica-
ble).
Cut the opening in the floor according to Table 6. The hole in
the floor must be cut to the dimensions listed in Table 6 since
the base is equipped with locating tabs that center the base
over the opening.
The opening in the base is 11/4" shorter and 1 1/8" narrower than
the recommended size of the opening in the floor. This is done to
provide a 1" clearance between the floor and the plenum.
2.
3.
4.
Fabricate the plenum to the dimensions given in Table 6.
Note that the dimensions given are outside dimensions.
Set the base over the opening in the floor, centering the open-
ing in the base over the opening in the floor. Fasten the base
to the floor with screws or nails. See Figure 19 and
Figure 20.
Drop the plenum through the opening in the base. The flange
of the plenum should rest on top of the combustible floor
base.
Figure 19 Exploded View of Base for
Downflow Cased Coil
Setting the Base
Subbase
Insulation
25-21-46b
Wood Floor
25 20 46A
This subbase for combustible floors has been designed so that
the height of the sub-base raises the downflow coil off the floor to
allow easy installation of the condensate drain. See Figure 21.
Figure 21 Condensate Line Raised by Base
Filters:
25-20-52
The filter may be installed in the return air plenum above the fur-
nace. A filter rack is supplied with each furnace. See Figure 22 or
Figure 23.
NOTE: The return air plenum MUST extend a sufficient height
above dimensions "A" (Figure 23) to provide for the attachment
of a return air duct or grille above the filters.
1. Insert end of filter rack with 3/4" (19mm) flange into slot in the
back of the unit, See Figure 22.
_] 441 012603 02
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