If these furnaces are used during construction when adhe-
sives, sealers, and/or new carpets are being installed, make
sure all combustion and circulating air requirements are
followed. If operation of furnace is required during construc-
tion, use clean outside air for combustion and ventilation.
Compounds of chlorine and fluorine, when burned with
combustion air, form acids which will cause corrosion of heat
exchangers. Some of these compounds are found in paneling,
dry wall adhesives, paints, thinners, masonry cleaning mate-
rials, and many other solvents commonly used in construction
process.
Excessive exposure to contaminated combustion air will
result in safety and performance related problems.
Provide ample space for servicing and cleaning. Always comply
with minimum fire protection clearances shown on unit’s clear-
ance to combustibles label. (See Fig. 3.) Locate furnace where
available electric power and gas supplies meet specifications on
furnace rating plate.
Step 2—Furnace Location Relative to Cooling
Equipment
The cooling coil must be installed parallel with or on downstream
side of furnace to avoid condensation in heat exchanger. When
installed parallel with a furnace, dampers or other means used to
control flow of air must prevent chilled air from entering furnace.
If dampers are manually operated, they must be equipped with a
means to prevent operation of either unit unless damper is in
full-heat or full-cool position.
Step 3—Hazardous Locations
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.
A93042
FRONT
RETURN
AIR
MAX 85°F MIN 55°F
°F °F
Do not install furnace on its back. Safety control operation
will be adversely affected. Never connect return-air ducts to
back of furnace. Failure to follow this warning could result in
fire, personal injury, or death.
A93043
FRONT
BACK
FRONT
B
A
C
K
If these furnaces are installed in an unconditioned space
where ambient temperatures may be 32°F or lower, freeze
protection measures must be taken.
A93058
32°F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
When furnace is installed in a residential garage, it must be
installed so that burners and ignition sources are located a
minimum of 18 in. above floor. The furnace must be located
or protected to avoid physical damage by vehicles. When
furnace is installed in a public garage, airplane hangar, or
other building having a hazardous atmosphere, unit must be
installed in accordance with requirements of National Fire
Protection Association, Inc.
A93044
18-IN. MINIMUM
TO BURNERS
12
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