Improper installation, adjustment, alteration, service, mainte-
nance, or use can cause carbon monoxide poisoning, explo-
sion, fire, electrical shock, or other conditions which may
cause personal injury or property damage. Consult a qualified
installer, service agency, local gas supplier, or your distribu-
tor or branch for information or assistance. The qualified
installer or agency must use only factory-authorized and
listed kits or accessories when modifying this product. A
failure to follow this warning can cause electrical shock, fire,
personal injury, or death.
For high-altitude installations, the high-altitude conversion kit
MUST be installed at or above 5500 ft above sea level. Obtain
high-altitude conversion kit from your area authorized distributor.
For accessory installation details, refer to applicable installation
literature.
NOTE:
Remove all shipping brackets and materials before oper-
ating furnace.
NOTE:
These furnaces are designed for a minimum continuous
return-air temperature of 60°F or intermittent operation down to
55°F such as when used with a night setback thermostat. Return-air
temperature must not exceed a maximum of 85°F. Failure to
follow these return-air temperature limits may affect reliability of
heat exchangers, motors, and controls (See Fig. 3.)
Fig. 2—Clearances to Combustibles
A00298
For horizontal furnaces wider than 14.25 inches
(362mm) may be 0 inches.
For upflow furnaces bottom clearance may be
0 inches.
Indicates supply or return sides when furnace is in
the horizontal position. Line contact only permissible
between lines formed by intersections of the Top
and two Sides of the furnace jacket, and building
joists, studs or framing.
18 inches front clearance required for alcove.
For single wall vent 6 inches.
For Type B-1 vent 3 inches.
3
222
91
-1
01
R
E
V
. J
MINIMUM INCHES CLEARANCE TO COMBUSTIBLE CONSTRUCTION
This forced air furnace is equipped for use with natural
gas at altitudes 0-5,500 ft. (0-1,675 m) above sea
level. The high-altitude conversion kit MUST be
installed above 5,500 ft (1,675 m). See the furnace
installation instructions for high altitude gas input
derating requirements.
An accessory kit, supplied by the manufacturer, shall
be used to convert to propane gas use or may be
required for some natural gas applications.
This furnace is for indoor installation in a building
constructed on site.
This furnace may be installed on combustible flooring
in alcove or closet at minimum clearance from
combustible material.
This furnace may be used with a Type B-1 Vent and
may be vented in common with other gas-fired
appliances.
Clearance in inches.
Clearance arrows
do not change with
furnace orientation.
##
1" #
0"
1"
1"
30"
MIN
S I
DE
F
R
O
N
T
B
C
K
A
S
E
R V
I
E
C
FR
ON
T
S I
E
C
Ô T
È
U
F
RN
AC
E
#
Ø
T
O
P /
PL
E
NUM
D
*
*
Vent Clearance to combustibles:
For Single Wall vents 6 inches.
For Type B-1 vent 1 inch.
This furnace is approved for UPFLOW and HORIZONTAL
installations.
# #
Ø
#
*
†
†
1"
#
BO
T
T
O
M
Fig. 3—Return-Air Temperature
A93042
3
