7
Installation Clearances and Accessibility
Unobstructed front clearance of 24" (61 cm) for servicing is
recommended.
NOTE: Top clearance for horizontal configuration is 1" (2.5 cm).
High Altitude Installations
High Altitude Derate
IMPORTANT: The furnace will naturally derate itself with altitude.
Do not attempt to increase the firing rate by changing orifices or
increasing the manifold pressure. This can cause poor
combustion and equipment failure.
High altitude installations may require both a pressure switch and
an orifice change. These changes are necessary to compensate
for the natural reduction in the density of both the gas fuel and
the combustion air at higher altitude.
For installations above 7,000 ft (2,133.6 m), refer to your local
distributor for required kit(s).
Contact your local distributor for a tabular listing of appropriate
manufacturer’s kits for propane gas and/or high altitude
installations. The indicated kits must be used to insure proper
furnace operation. All conversions must be performed by a
qualified installer or service agency.
Propane Gas Conversion
This unit is configured for Natural gas. The appropriate
manufacturer’s propane gas conversion kit must be applied for
propane gas installations.
Contact your local distributor for a tabular listing of appropriate
manufacturer’s kits for propane gas and/or high altitude
installations. The indicated kits must be used to insure safe and
proper furnace operation. All conversions must be performed by
a qualified installer or service agency.
Installation Configurations
Horizontal Installation
Line contact to framing is permitted when installed in the
horizontal configuration. Line contact is defined as the portion of
the cabinet that is formed by the intersection of the top and side.
IMPORTANT: Accessibility clearance, where greater, should take
precedence over minimum fire protection clearance.
A gas-fired furnace for installation in a residential garage must be
installed so that the ignition source and burners are located not
less than 18" (45.7 cm) above the floor and are protected or
located to prevent physical damage by vehicles.
A gas furnace must not be installed directly on carpeting, tile, or
other combustible materials other than wood flooring.
Clearances to Combustibles—in. (cm)
Vent Pipe
B1-Vent
Single Wall
Connector Sides
Front
Back Top (Plenum)
1 (2.5)
6 (15.2)
1 (2.4)
3 (7.6)
0
1 (2.5)
A. Top clearance—1" (2.5 cm)
B. Vent pipe clearance—6" (15.2 cm)
for single wall connector, 1"
(2.5 cm) for B-1 vent
C. Back clearance—0"
D. Side clearance—1" (2.5 cm)
E. Front clearance—3" (7.6 cm)
B
A
C
D
E
Manifold
Pressure
Pressure
Switch
Change
Gas
Altitude
Kit
Orifice
High
Stage
Low
Stage
Natural
0 to
7,000 ft
(2,133.6 m)
None #43
3.5"
W.C.
1.9"
W.C.
None
Propane
LPM-
03B
#55
10.0"
W.C.
6.0"
W.C.
None
NOTE: In Canada, gas furnaces are only certified to 4,500 ft
(1,371.6 m).
Goodman 53
Failure to follow these instructions can result in bodily
injury or death. Carefully read and follow all instructions
given in this section.
WARNING