Lennox EL296DFV Installation Instructions Manual page 11

TABLE 2
COMBUSTIBLE FLOORING BASE OPENING SIZE
Cabinet Catalog
Width Number
B Cabinet
11M60
(17.5")
C Cabinet
11M61
(21")
FURNACE
PROPERLY
SIZED FLOOR
OPENING
FIGURE 15
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 posi­
tioned.
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 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 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.
Front to Rear Side to Side
in. mm in. mm
22 559 18 - 3/4
22 559 22 - 3/4
SUPPLY AIR
PLENUM
COMBUSTIBLE
FLOORING BASE
476
578
PROPERLY
SIZED FLOOR
OPENING
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 follow­
ing steps should be taken when installing plenum:
1 - Bottom edge of plenum should be flanged with a
hemmed edge (See figure 17 or 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 fur­
nace using sheet metal screws.
4 - Make certain that an adequate seal is made.
PLENUM
(Field Provided)
SEALING STRIP
(Field Provided)
PLENUM
(Field Provided)
SECURE FROM
INSIDE CABINET
Page 11
FURNACE
COOLING COIL
PLENUM
FIGURE 16
SECURE FROM
OUTSIDE CABINET
É É É É
CABINET
SIDE PANEL
Side View
FIGURE 17
SEALING STRIP
(Field Provided)
É É É É
CABINET
SIDE PANEL
Side View
FIGURE 18