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Improper installation of the furnace can result in
personal injury or death. Combustion and flue products
must never be allowed to enter the return air system
or air in the living space. Use sheet metal screws and
joint tape to seal return air system to furnace.
In platform installations with furnace return, the furnace
should be sealed airtight to the return air plenum. A
door must never be used as a portion of the return air
duct system. The base must provide a stable support
and an airtight seal to the furnace. Allow absolutely no
sagging, cracks, gaps, etc.
For no reason should return and supply air duct systems
ever be connected to or from other heating devices such
as a fireplace or stove, etc. Fire, explosion, carbon
monoxide poisoning, personal injury and/or property
damage could result.
The unit may be installed three ways in downflow
applications: on non-combustible flooring, on combustible
flooring using an additive base, or on a reverse-flow cooling
coil cabinet. Do not drag the unit across the floor in the
downflow position. Floor and furnace flange damage
will result.
Refer to Figure
13 for clearances in downflow applications.
Downflow Application Installation Clearances
Figure 13
Page 10 of 58
WARNING
Installation on Non-Combustible Flooring
1. Cut floor opening keeping in mind clearances listed
on unit rating plate. Also keep in mind gas supply
connections, electrical supply, flue and air intake
connections and sufficient installation and servicing
clearances. See Table 1 for correct floor opening size.
2. Flange warm air plenum and lower the plenum into the
opening.
3. Set the unit over the plenum and seal the plenum to the
unit.
4. Ensure that the seal is adequate.
Non-Combustible Floor Opening Size
Installation on Combustible Flooring
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.
The furnace and combustible flooring base shall not be
installed directly on carpeting, tile, or other combustible
material other than wood flooring.
Issue 1621
Table 1
Figure 14
CAUTION
507052-04
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