International comfort products C9MVX Installation Instructions Manual page 42

90+ two-stage & two-stage, variable category iv, gas furnace
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The Subbase for Combustible Floors MUST be used when a
downflow furnace is set on a combustible floor, even when the
furnace is installed on a coil box.
1.
Cut the opening in the floor according to Table 11. The hole
in the floor must be cut to the dimensions listed in Table 11
since the base is equipped with locating tabs that center the
base over the opening.
The opening in the base is 1
(28.6mm) 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 11.
Note that the dimensions given are outside dimensions.
3.
Set the base over the opening in the floor, centering it over
the opening. Fasten the base to the floor with screws or
nails. See Figure 41, Figure 42 and Figure 43.
4.
Drop the plenum through the opening in the base. The
flange of the plenum should rest on top of the subbase.
Exploded View of Sub−Base for
Figure 41
Furnace ONLY
T
Plenum
H
K
R
P
2"
L
(50.8mm)
A
5.
Position furnace or coil cabinet and furnace on subbase so it
aligns between the locating tabs.
Exploded View of Base for
Figure 42
Downflow Cased Coil
42
1
/
" (31.8mm) shorter and 1
4
S
A = 4 1/4" (108mm) Minimum
clearance from back of hole
to wall or other obstruction.
J
2" (50.8mm)
1" (25.4mm)
M
N
Hole in
Floor
25-20-46
1
" (63.5mm)
2
/
2
1
" (38.1mm)
1
/
2
Specifications are subject to change without notice.
Figure 43
Furnace
Installation of
Combustible
Floor Base
1
/
"
8
This subbase for combustible floors has been designed so that the
height of the subbase raises the downflow coil off the floor to allow
easy installation of the condensate drain. See Figure 44.
Figure 44
Setting the Subbase
Plenum
Condensate Line Raised by Base
440 01 2024 04
Wood Floor
25−20−46a
25−20−52

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