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FURNACE
PROPERLY
SIZED FLOOR
OPENING
NON-COMBUSTIBLE
FLOORING
Figure 14.
Installation on Combustible Flooring
See Figure 15
1. When unit is installed on a combustible floor, a
downflow combustible flooring base must be installed
between the furnace and the floor. The base must be
ordered separately. See Table 2 for opening size to
cut in floor.
The furnace and combustible flooring base shall not be
installed directly on carpeting, tile, or other combustible
material other than wood flooring.
Cabinet
Catalog
Width
Number
B cabinet
11M60
(17.5")
C cabinet
11M61
(21")
Table 2. Combustible Floor Base Opening Size
FURNACE
PROPERLY
SIZED FLOOR
OPENING
Figure 15.
2.
After opening is cut, set the combustible flooring base
into opening.
507735-03
SUPPLY AIR
PLENUM
CAUTION
Front to Rear
Side to Side
in.
mm
in.
22
559
18-3/4
22
559
22-3/4
SUPPLY AIR
PLENUM
COMBUSTIBLE
FLOORING BASE
COMBUSTIBLE
FLOORING
3.
Check fiberglass strips on the combustible flooring
base to make sure they are properly glued and
positioned.
4.
Lower supply air plenum into the combustible flooring
base until plenum flanges seal against fiberglass
strips.
NOTE: Be careful not to damage fiberglass strips.
Check for a tight seal.
5.
Set the furnace over the plenum.
6.
Ensure that the seal between the furnace and plenum
is adequate.
Installation on Cooling Coil Cabinet
See Figure 16
NOTE: Downflow combustible flooring kit is not used.
1. Refer to reverse-flow coil installation instructions for
correctly sized opening in floor and installation of
cabinet.
2.
When cooling cabinet is in place, set and secure the
furnace according to the instructions that are provided
with the cooling coil. Secure the furnace to the cabinet.
3.
Seal the cabinet and check for air leaks.
mm
PROPERLY
476
SIZED FLOOR
OPENING
578
Return Air Opening - Downflow Units
Return air may be brought in only through the top opening of
a furnace installed in the downflow position. The following
steps should be taken when installing plenum:
1. Bottom edge of plenum should be flanged with a
hemmed edge (see Figure 17 or Figure 18).
2.
Sealing strips should be used to ensure an airtight
seal between the cabinet and the plenum.
3.
In all cases, plenum should be secured to top of
furnace using sheet metal screws.
4.
Make certain that an adequate seal is made.
Issue 1933
FURNACE
COOLING COIL
PLENUM
Figure 16.
Page 11 of 53
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