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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 fur
nace. Doing so will adversely affect the operation of
the safety control devices, which could result in per
sonal injury or death.
The 80AF1UH 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 blower motors are equipped with
three flexible legs and one rigid leg. See figure 6. 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 opera
tion.
After the bolt and washer have been removed, the rig
id leg will not touch the blower housing.
FIGURE 6
RIGID LEG
remove shipping bolt and washer
110P16C and 110P20C with 1/2 HP
BLOWER MOTOR
Upflow Applications
Allow for clearances to combustible materials as indicated
on the unit nameplate. Minimum clearances for closet or al
cove installations are shown in figure 7.
Upflow Application Installation Clearances
Top
Bottom
Left Side
Right Side
Type of Vent
Connector
Type C
Type B1
Top
1 in. (25 mm)
1 in. (25 mm)
*Front
2-1/4 in. (57 mm)
2-1/4 in. (57 mm)
Back
0
0
Sides
0
†
0
Vent
6 in. (152 mm)
1 in. (25 mm)
Floor
0
‡
0
‡
*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 7
