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Non- Combustible Floor Opening Size
NOTE: Floor opening dimensions listed are 1/4 inch (6 mm) larger
than the unit opening. See dimension drawing on page 2.
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. units should not be
installed in areas normally subject to freezing
temperatures.
Combustible Flooring Base Opening Size
Page 8 of 52
Table 1
Figure 8
Table 2
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.
Issue 1034
Figure 9
506552-01
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