Lennox SLP98DFV Installation Instructions Manual page 8

TABLE 1
NON-COMBUSTIBLE FLOOR OPENINGSIZE
Front to Rear
Cabinet Width
in
B Cabinet 17 - 1/2" 19 - 3/4
C Cabinet 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.
FURNACE
PROPERLY
SIZED FLOOR
OPENING
FIGURE 8
Installation on Combustible Flooring (Figure 9)
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.
CAUTION
The furnace and combustible flooring base shall not be
installed directly on carpeting, tile, or other combustible
material other than wood flooring.
TABLE 2
COMBUSTIBLE FLOORING BASE OPENING SIZE
Cabinet Catalog Front to Rear
Width Number
in
B Cabinet 11M60 22
17 - 1/2"
C Cabinet 11M61 22
21"
Side to Side
mm in mm
502 16 - 5/8 422
502 20 - 1/8 511
SUPPLY AIR
PLENUM
Side to Side
mm in mm
559 18 - 3/4 476
559 22 - 3/4 578
FURNACE
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
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.
Page 8
SUPPLY AIR
PLENUM
COMBUSTIBLE
FLOORING BASE
FIGURE 9