WARNING: Do not install furnace on its back. Safety
control operation will be adversely affected. Never con-
nect return-air ducts to back of furnace. Failure to follow
this warning could result in fire, personal injury, or death.
CAUTION: If these furnaces are used during construc-
tion when adhesives, 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 construction, 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 adhe-
sives, paints, thinners, masonry cleaning materials, and
many other solvents commonly used in construction
process.
Excessive exposure to contaminated combustion air will
result in safety and performance related problems.
CAUTION: If these furnaces are installed in an uncon-
ditioned space where the ambient temperatures may be
32°F or lower, freeze protection measures must be taken.
Provide ample space for servicing and cleaning. Always comply
with minimum fire protection clearances shown on units clearance
and combustibles label. (See Fig. 3.) Locate furnace where
available electric power and gas supplies meet specifications on
furnace rating plate.
A93025
UPFLOW OR DOWNFLOW HORIZONTAL
FRONT
LEVEL (0″)
TO
1
⁄2″ MAX
LEVEL (0″)
TO
1
⁄2″ MAX
FRONT
A93042
A93043
FRONT
BACK
FRONT
B
A
C
K
A93058
32°F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
—12—
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