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3.
Set the unit over the plenum and seal the plenum to
the unit.
4.
Ensure that the seal is adequate.
Front to Rear
Cabinet Width
in.
B (17.5")
19-3/4
C (21")
19-3/4
NOTE: Floor opening dimensions listed are 1/4 inch (6 mm)
larger than the unit opening. See dimension drawing on Page
2.
Table 1. Non-Combustible Floor Opening Size
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 (17.5")
11M60
C (21")
11M61
Table 2. Combustible Floor Base Opening Size
507769-05G / 31-5000656
Side to Side
mm
in.
502
16-5/8
502
20-1/8
SUPPLY AIR
PLENUM
CAUTION
Front to Rear
Side to Side
in.
mm
in.
22
559
18-3/4
22
559
22-3/4
FURNACE
mm
PROPERLY
422
SIZED FLOOR
OPENING
511
2.
After opening is cut, set the combustible flooring base
into opening.
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
PROPERLY
SIZED FLOOR
OPENING
mm
476
578
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.
Issue 2223
SUPPLY AIR
PLENUM
COMBUSTIBLE
FLOORING BASE
COMBUSTIBLE
FLOORING
Figure 15.
FURNACE
COOLING COIL
PLENUM
Figure 16.
Page 11 of 55
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