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Installation on Non-Combustible Flooring
See Figure 15
1.
Cut floor opening keeping in mind clearances listed
on unit rating plate. Also keep in mind gas supply
connections, electrical supply, flue and air intake
connections and sufficient installation and servicing
clearances. See Table 1 for correct floor opening size.
2.
Flange warm air plenum and lower the plenum into the
opening.
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 cabinet
19-3/4
(17.5")
C cabinet
19-3/4
(21")
NOTE: Floor opening dimensions listed are 1/4 in. (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 15.
Installation on Combustible Flooring
See Figure 16
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.
507271-02
Side to Side
mm
in.
502
16-5/8
502
20-1/8
SUPPLY AIR
PLENUM
CAUTION
Cabinet
Width
B cabinet
(17.5")
C cabinet
(21")
Table 2. Combustible Flooring Base Opening Size
mm
SIZED FLOOR
422
COMBUSTIBLE
511
FLOORING
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 17
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.
Issue 1917
Front to Rear
Catalog
Number
in.
mm
11M60
22
559
11M61
22
559
FURNACE
PROPERLY
OPENING
Figure 16.
Side to Side
in.
mm
18-3/4
476
22-3/4
578
SUPPLY AIR
PLENUM
COMBUSTIBLE
FLOORING BASE
Page 11 of 51
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