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Do not install the furnace on its back or side. Safety control
operation will be adversely affected. Never connect return-air
ducts to the back of the furnace. Failure to follow this warning
could result in a fire, personal injury, or death.
This furnace may be installed in an unconditioned space with
possible ambient temperatures of 32°F or lower if special
installation requirements are met. See Step 7—Direct Venting
and Step 9—Condensate Drainage.
GENERAL — When a furnace is installed so that the supply ducts
carry air to areas outside the space containing the furnace, the
return air must also be handled by duct(s) sealed to the furnace
casing and terminating outside the space containing the furnace to
ensure there will not be a negative pressure condition within the
equipment room or space.
This furnace must be located so the electrical components are
protected from water.
This furnace may be located in a confined space without special
provisions for dilution or ventilation air.
Locate the furnace as close to the center of the air distribution
system as possible.
For proper furnace operation, locate and install the furnace so it is
within 1/2 in. of level. Refer to Step 9—Condensate Drainage.
Locate the furnace so that maximum allowable vent and
combustion-air pipe lengths are not exceeded. Refer to Step
7—Direct Venting.
Provide ample space for servicing and cleaning. Always comply
with the minimum fire protection clearances shown on the unit
rating plate and in Table 1.
Locate the furnace where available electrical and gas supplies meet
the specifications on the furnace rating plate.
FURNACE LOCATION RELATIVE TO COOLING EQUIP-
MENT — The cooling coil must be installed parallel with or on
the downstream side of the furnace to avoid condensation in the
heat exchanger. When installed parallel with a furnace, dampers or
other means used to control the flow of air must prevent chilled air
from entering the furnace. If the dampers are manually operated,
they must be equipped with a means to prevent operation of either
unit unless the damper is in the full-heat or full-cool position.
HAZARDOUS LOCATIONS — When the furnace is installed in
a residential garage, it must be installed so that the burners and
ignition source are located a minimum of 18 in. above the floor.
The furnace alos must be located or protected to avoid physical
damage by vehicles.
When the furnace is installed in a public garage, airplane hangar,
or another building having a hazardous atmosphere, the unit must
be installed in accordance with the requirements of the National
Fire Protection Association, Inc.
This furnace is not watertight and is not designed for outdoor
installation. This furnace shall be installed in such a manner
as to protect the electrical components from water. Outdoor
installation would lead to a hazardous electrical condition and
premature component failure. Failure to follow this warning
could result in fire, personal injury, or death.
Step 2—Horizontal Attic Installation
Do not install the furnace on its back. Safety control operation
will be adversely affected. Never connect return-air ducts to
the sides or back of the furnace. Failure to follow this warning
could result in fire, personal injury, or death.
The furnace can be installed horizontally for either left- or
right-side supply. See Fig. 2 for a typical attic installation and Step
10 for field reversing procedure.
Fig. 2—Typical Attic Installation
A91192
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