I.
LOCATION
A.
General
CAUTION:
Do not use this furnace during construction
when adhesives, sealers, and/or new carpets are being
installed and curing. If the furnace is required during
construction, use clean outside air for combustion and
ventilation. Compounds of chlorine and fluorine, when
burned in combustion air, form acids which will cause
corrosion of the heat exchangers and metal vent system.
Some of these compounds are released from paneling and
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.
CAUTION:
Do not install furnace in a corrosive or
contaminated atmosphere. Make sure all combustion and
circulating air requirements are met.
This furnace must be installed so the electrical components are
protected from water.
Locate furnace as near the center of the air distribution system and
chimney or vent as possible. The furnace should be installed as
level as possible. When a furnace is installed so that supply ducts
carry air to areas outside the space containing the furnace, return
air must also be handled by a duct(s) sealed to the furnace casing
and terminating outside the space containing the furnace.
Provide ample space for servicing and cleaning. Always comply
with minimum fire protection clearances shown on unit clearance
label. This furnace shall not be installed directly on carpeting, tile,
or any combustible material other than wood flooring.
B.
Location Relative to Cooling Equipment
The cooling coil must be installed parallel with or on downstream
side of furnace to avoid condensation in heat exchangers. When
installed parallel with a furnace, dampers or other means used to
control the flow of air must prevent chilled air from entering
furnace. If dampers are manually operated, they must be equipped
with means to prevent operation of either unit unless damper is in
full-heat or full-cool position.
C.
Hazardous Locations
II.
AIR FOR COMBUSTION AND VENTILATION
Provisions for adequate combustion and ventilation air must be
provided in accordance with Section 5.3, Air for Combustion and
Ventilation, of the NFGC or applicable provisions of the local
building codes.
Canadian installations must be in accordance with NSCNGPIC
and all authorities having jurisdiction.
CAUTION:
Air for combustion must not be contami-
nated by halogen compounds, which include fluoride,
chloride, bromide, and iodide. These elements are found
in aerosol sprays, detergents, bleaches, cleaning solvents,
salts, air fresheners, and other household products.
All fuel-burning equipment must be supplied with air for combus-
tion of fuel. Sufficient air MUST be provided to ensure there will
not be a negative pressure in the equipment room or space. In
addition, a positive seal MUST be made between furnace cabinet
and return-air duct to prevent pulling air from burner area and draft
safeguard opening into the circulating air.
CAUTION:
The operation of exhaust fans, kitchen ven-
tilation fans, clothes dryers, or fireplaces could create a
negative air pressure condition at the furnace. Make-up
air must be provided for these devices, in addition to that
required by the furnace.
Combustion air requirements are determined by whether furnace is
in an UNCONFINED or CONFINED space.
A.
Unconfined Space
An unconfined space must have at least 50 cu ft for each 1000
Btuh of input for all appliances (such as furnaces, clothes dryer,
water heaters, etc.) in the space.
NOTE:
These furnaces are designed for a minimum continu-
ous 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 maxi-
mum of 85°F. Failure to follow these return-air temperature
limits may affect reliability of heat exchangers, motors, and
controls.
A99075
FRONT
RETURN
AIR
MAX 85
°
F
MIN 55
°
F
°
F
°
F
WARNING:
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 accor-
dance with requirements of National Fire Protection
Association, Inc.
A93044
18-IN. MINIMUM
TO BURNERS
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