506843-01
Page 11 of 39
Issue 1132
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.
er opening is
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 13)
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.
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 following
steps should be taken when installing plenum:
1. Bottom edge of plenum should be flanged with a
hemmed edge (See Figure 14 or 15).
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 furnace
using sheet metal screws.
4. Make certain that an adequate seal is made.
COMBUSTIBLE FLOORING BASE OPENING SIZE
Table 2
Figure 12
Figure 14
Figure 15
Figure 13
