INSTALLATION INSTRUCTIONS
Gas Furnace: (F/G)9MAE
22
440 01 4300 02
Specifications subject to change without notice.
Figure 25
Working Platform for Attic Installation
2
−
in.
(51 mm)
A11154
ROLLOUT PROTECTION RE-
QUIRED Install 1.2” x 22” (305 x 559
mm) sheet metal in front of burner
compartment area.
COMBUSTION
−
AIR PIPE
(SEE VENTING SECTION)
NOTE
:
Local codes may require a drain pan and condensate trap when a condensing furnace is installed over a finished
ceiling
Roll
−
Out Protection
Provide a minimum 12
−
in. x 22
−
in. (305 x 559 mm) piece of
sheet metal for flame roll
−
out protection in front of burner area
for furnaces closer than 12
−
in. (305 mm) above the
combustible deck or suspended furnaces closer than 12
−
in.
(305mm) to joists. The sheet metal MUST extend underneath
the furnace casing by 1
−
in. (25mm) with the door removed.
The bottom closure panel may be used for flame roll
−
out
protection when bottom of furnace is used for return air
connection. See
Figure 25
for proper orientation of roll
−
out
shield.
Supply Air Connections
For a furnace not equipped with a cooling coil, the outlet duct
shall be provided with a removable access panel. This opening
shall be accessible when the furnace is installed and shall be of
such a size that the heat exchanger can be viewed for possible
openings using light assistance or a probe can be inserted for
sampling the air stream. The cover attachment shall prevent
leaks.
Connect supply
−
air duct to flanges on furnace supply
−
air
outlet. Bend flange upward to 90
with wide duct pliers. (See
Figure 21
) The supply
−
air duct must be connected to ONLY
the furnace supply
−
outlet
−
air duct flanges or air conditioning
coil casing (when used). DO NOT cut main furnace casing side
to attach supply air duct, humidifier, or other accessories. All
supply
−
side accessories MUST be connected to duct external
to furnace main casing.
Return Air Connections
The return
−
air duct may be connected to bottom of the furnace.
The side of casing that faces downward may also be used for
return air connection. A combination of the bottom and
downward facing side may also be used. The upward facing
side of the casing cannot be used as a return air connection.
(See
Figure 28
)
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed
in bottom return
−
air opening. Remove this panel when bottom
return air is used. This panel may be used for rollout protection
or discarded. To remove bottom closure panel, perform the
following:
1. Tilt or raise furnace and remove four (4) screws holding
bottom plate. (See
Figure 18
)
2. Remove bottom plate.
3. Remove bottom closure panel.
4. Reinstall bottom plate and screws.
Side Return Air Inlet
These furnaces are shipped with bottom closure panel installed
in bottom return
−
air opening. This panel MUST be in place
when side return air inlet(s) are used without a bottom return air
inlet.
Not all horizontal furnaces are approved for side return air
connections (See
Figure 28
)
