Furnace may be located in a confined space without special
provisions for dilution or ventilation air. This furnace must be
installed so electrical components are protected from water.
Locate furnace as close to center of air distribution system as
possible.
Locate furnace so combustion-air pipe lengths are not exceeded.
Refer to Table 6.
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 the con-
struction 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.
NOTE: For proper furnace operation, install furnace so that it is
level or pitched forward within 1/2 in. to ensure proper condensate
drainage from secondary heat exchangers.
A93025
UPFLOW OR DOWNFLOW HORIZONTAL
FRONT
LEVEL (0″)
TO
1
⁄2″ MAX
LEVEL (0″)
TO
1
⁄2″ MAX
FRONT
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
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
12
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