CAUTION: If these furnaces are used during construction 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 adhesives, paints, thinners, masonry cleaning materials, and many other solvents commonly used in the
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 clearance to
combustibles label. (See Fig. 3.) Locate furnace where available electric power and gas supplies meet specifications on furnace rating plate.
WARNING: Do not install furnace on its back. (See Fig. 14.) 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.
CAUTION: If this furnace is installed in an unconditioned space where the ambient temperatures may be 32°F or lower,
freeze protection measures must be taken. (See Fig. 15.)
PROCEDURE 2—LOW-FIRE ONLY INSTALLATION
This 355MAV furnace can be installed to operate in the low-fire only heating mode when sized using the low-fire heating capacity. This is
accomplished by placing setup switch SW-2 in the ON position to provide only low-fire-heat operation. See Fig. 31 and Table 11. With this setup,
high-fire operation will not occur.
When the model no. on the furnace rating plate is followed by an asterisk (*), the furnace has an alternate low-fire only efficiency rating as listed
in the GAMA and CEC directories. This alternate rating will be listed as the furnace model number followed by an (-L) suffix.
Fig. 14—Prohibit Installation on Back
A93043
FRONT
BACK
FRONT
B
A
C
K
Fig. 15—Freeze Protection
A93058
32
o
F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
—16—
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