Furnace Location Relative To Cooling Equipment; Hazardous Locations; Installation; Leveling Legs (If Desired) - Carrier 58MXA Nstallation, Start-Up, And Operating Instructions

FRONT
BACK
FRONT
Fig. 14—Prohibit Installation on Back
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. (See Fig. 14.)
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.
32°F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
Fig. 15—Freeze Protection
If these furnaces are installed in an unconditioned space
where the ambient temperatures may be 32°F or lower, freeze
protection measures must be taken. (See Fig. 15.)
Provide ample space for servicing and cleaning. Always comply
with minimum fire protection clearances shown on units clearance
B
A
and combustibles label. (See Fig. 3.) Locate furnace where
C
available electric power and gas supplies meet specifications on
K
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
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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
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. (See Fig. 16.)
Step 1—Leveling Legs (If Desired)
When furnace is used in upflow position with side inlet(s), leveling
legs may be desired. (See Fig. 17.) Install field-supplied,
corrosion-resistant 5/16-in. machine bolts and nuts.
NOTE: The maximum length of bolt should not exceed 1-1/2 in.
1. Position furnace on its back. Locate and drill a 5/16–in.
diameter hole in each bottom corner of furnace. (See Fig. 17.)
Holes in bottom closure panel may be used as guide locations.
2. For each hole, install nut on bolt and then install bolt and nut
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in hole. (Install flat washer if desired.)
3. Install another nut on other side of furnace base. (Install flat
washer if desired.)
13
18-IN. MINIMUM
TO BURNERS
Fig. 16—Installation in a Garage

INSTALLATION

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