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Setting Equipment
Do not install the furnace on its front or its back. Do not
connect the return air ducts to the back of the furnace.
Doing so will adversely affect the operation of the safety
control devices, which could result in personal injury or
death.
Select a location that allows for the required clearances
that are listed on the unit nameplate. Also consider gas
supply connections, electrical supply, vent connection, and
installation and service clearances [24 inches (610 mm) at
unit front]. The unit must be level.
NOTE: Units with 1/2 hp blower motors are equipped with
three flexible legs and one rigid leg. See Figure 7. The rigid
leg is equipped with a shipping bolt and a flat white plastic
washer (rather than the rubber mounting grommet used
with a flexible mounting leg). The bolt and washer must be
removed before the furnace is placed into operation. After
the bolt and washer have been removed, the rigid leg will
not touch the blower housing.
507327-01
WARNING
Units with 1/2 HP
Blower Motor
Figure 7
Downflow Applications
Allow for clearances to combustible materials as indicated
on the unit nameplate. Minimum clearances for closet or
alcove installations are shown in Figure 8.
Type of Vent
Connector
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.
‡ For installation on a combustible floor, do not install the
furnace directly on carpeting, tile or other combustible
materials other than wood flooring.
† Left side requires 3 inches if a single wall vent is used on
14-1/2 inch cabinets.
Figure 8. Downflow Application Installation
Figure 9
Issue 1809
Type C
1 in. (25 mm)
1in. (25 mm)
24-1/4 in. (57 mm)
2-1/4 in. (mm)
0
0†
6 in. (152 mm)
1 in. (25 mm)
0‡
Clearances
Type B1
0
0
0‡
Page 9 of 34
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