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TABLE 1
NON−COMBUSTIBLE FLOOR OPENING SIZE
Cabinet Width
Front to Rear Side to Side
in. mm in. mm
B Cabinet (17.5") 19 − 3/4 502 16 − 5/8 422
C Cabinet (21") 19 − 3/4 502 20−1/8 511
NOTE − Floor opening dimensions listed are 1/4 inch (6 mm) larger than
the unit opening. See dimension drawing on page 2.
FIGURE 8
SUPPLY AIR
PLENUM
PROPERLY
SIZED FLOOR
OPENING
SLP98DF UNIT
Installation on Combustible Flooring (Figure 9)
1 − When unit is installed on a combustible floor, a down-
flow combustible flooring base must be installed be-
tween the furnace and the floor. The base must be or-
dered separately. See table 2 for opening size to cut in
floor.
CAUTION
The furnace and combustible flooring base shall not
be installed directly on carpeting, tile, or other com-
bustible material other than wood flooring.
TABLE 2
COMBUSTIBLE FLOORING BASE OPENING SIZE
Cabinet
Width
Catalog
Number
Front to Rear Side to Side
in. mm in. mm
B Cabinet
(17.5")
11M60
22 559 18 − 3/4 476
C Cabinet
(21")
11M61
22 559 22 − 3/4 578
FIGURE 9
SLP98DF UNIT
SUPPLY AIR
PLENUM
COMBUSTIBLE
FLOORING BASE
PROPERLY
SIZED FLOOR
OPENING
2 − After opening is cut, set combustible flooring base into
opening.
3 − Check fiberglass strips on combustible flooring base
to make sure they are properly glued and positioned.
4 − Lower supply air plenum into 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 (Figure 10)
NOTE − Downflow combustible flooring base is not used.
1 − Refer to reverse−flow coil installation instructions for
correctly sized opening in floor and installation of cabi-
net.
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.