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Figure 6.
Allow for clearances to combustible materials as indicated
on the unit nameplate. Minimum clearances for closet or
alcove installations are shown in Figure 7.
WARNING
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.
WARNING
Blower access panel must be securely in place when
blower and burners are operating. If panels are left off,
gas fumes, which could contain carbon monoxide, can
be drawn into living space resulting in personal injury
or death.
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.
507029-05
Units with 1/2 HP
Blower Motor
Issue 2241
Refer to Figure 2 for clearances in downflow applications.
Top
* Front
Back
Sides
Vent
Floor
* Front clearance in alcove installation must be 24 in. (610
mm). Maintain a minimum of 24 in. (610 mm) for front service
access.
† Allow proper clearances to accommodate condensate trap
installation.
‡ For installations on a combustible floor, do not install
the furnace directly on carpeting, tile or other combustible
materials other than wood flooring.
Figure 7. Downflow Application
Installation Clearances
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.
Front to Rear
Cabinet Width
B (17.5")
19-3/4
C (21")
19-3/4
NOTE: Floor opening dimensions listed are 1/4 inch (6mm) larger
than the unit opening. See dimension drawing on Page 2.
Table 1. Non-Combustible Floor Opening Size
0
0
0
0†
0
NC‡
Side to Side
in.
mm
in.
502
16-5/8
502
20-1/8
Page 7 of 73
mm
422
511
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