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In a residential garage, a gas-fired furnace must be installed
so the burner(s) and the ignition source are located not less
than 18" above the floor. The furnace is to be located or
protected to avoid physical damage by vehicles.
Furnaces may be installed as suspended units in the
horizontal position. These furnaces are not designed for
direct attachment of suspension rods to the furnace casing.
See "Installation Configurations."
If the furnace is to be installed in an attic or other insulated
space, it must be kept free and clear of insulating materials.
Installation Clearances
A 2" minimum clearance is required in front for air openings
into the combustion chamber.
All servicing and cleaning of the furnace can be performed
from the front. If installed in a closet or utility room, provide
24" clearance in front for service if the door to the room is not
in line with the front of the furnace. Where servicing
clearances are greater than clearances to combustibles,
servicing clearances take precedence.
Minimum Clearance to Combustibles Chart
(all measurements in inches)
Upflow Installations
Cabinet Width
Front Back Top
1
17.5
4
0
1
21.0
4
0
24.5
4
1
0
Horizontal Installations
Cabinet
Width
Front Back
Vent
17.5
4
1
0
6
2
21.0
4
1
0
6
2
24.5
4
1
0
6
2
1
May be 2" when Type B-1 vent pipe is used.
2
May be 1" when Type B-1 vent pipe is used.
3
Where values greater than 0 are shown, may be 0" when Type
B-1 vent pipe is used.
High Altitude Installations
This furnace is approved for operation at altitudes from 0 to
4,500 ft above sea level without any required modifications.
From 4,500 to 7,500 ft, the gas manifold pressure needs to be
adjusted according to the information shown in the Manifold
Pressure vs. Altitude Chart.
IMPORTANT:
For installations above 7,500 ft, the furnace input rate is to be
reduced per the requirements of the National Fuel Gas Code
(ANSI Z223.1/NFPA 54, latest edition), at the rate of 4 percent for
each 1,000 ft above sea level.
The furnace is not recommended for installation above 10,000 ft.
4
Sides
Vent
Left Right
2
3
1
6
2
0
2
1
6
0
0
1
6
2
0
0
Airflow
R to L
L to R
Top
Bottom Top
Bottom
1
2
2
2
2
0
2
2
0
1
0
1
0
1
0
Installation Configurations
Upflow Installations
Furnaces can be installed with either a side or bottom air return.
For bottom air return the bottom air return knockout plate must
be removed. For units that do not include a side or bottom return
filter rack, kit no. AFILT524-1 (side return) or kit no. AFILT529-1
(bottom return) can be used.
To provide sufficient filter area for installations requiring more
than 1,600 CFM nominal air delivery, return air will have to be
brought through both sides of the furnace, or through one side
and the bottom.
Horizontal Installations
Furnaces can be horizontally installed for airflow right to left or
left to right. To ensure access to parts for servicing, install upflow
and counterflow furnaces so that the burner and blower access
panels are readily accessible.
NOTE: When installed horizontally, the installer must install a
sheet metal screw to retain the upper door as shown following, in
either Position A or B, depending on installation configuration.
Horizontal Installation
Supply
A. Screw placement for Right to Left airflow
B. Screw placement for Left to Right airflow
Horizontal Installation—Suspended
Furnaces may be installed as suspended units in the horizontal
position. These furnaces are not designed for direct attachment
of suspension rods to the furnace casing.
The suspending means must be field fabricated, and should
consist of 2 "cradles" made by attaching 2 rods to a length of
angle iron or suitable gauge steel.
Locate the cradles so that they are as close as possible to the
ends of the furnace (this will provide access for removal of
major components such as the blower assembly).
Provide enough clearance between the suspension rods and
the furnace to allow removal of access panels.
Ductwork Requirements
Install the conditioned air plenum, ducts and air filters (if not
provided on the furnace) in accordance with NFPA 90B Standard
for the Installation of Warm Air Heating and Air-Conditioning
Systems (latest edition).
The furnace is provided with flanges for the connection of the
plenum and ducts.
All air filters must be listed as Class 2 furnace air filters.
A
Return
B
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