Owner`s manual
506843-01 Page 9 of 39Issue 1132
The gas furnace can be installed as shipped in either the
upflow position or the horizontal position.
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 & 3/4 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.
Setting Equipment
WARNING
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.
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.
Return Air
Return air must be brought in through the top of the furnace
installed in an downflow application.
Figure 8
Downflow Application Installation Clearances
* 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 9
Figure 7
Units with 1/2 HP & 3/4 HP
Blower Motor.