Operating instructions

WARNING: Improper installation, adjustment, alter-
ation, service, maintenance, or use can cause carbon
monoxide poisoning, explosion, fire, electrical shock, or
other conditions which may cause personal injury, loss of
life, or property damage. Consult a qualified installer,
service agency, local gas supplier, or your distributor or
branch for information or assistance. The qualified in-
staller or agency must use only factory-authorized and
listed kits or accessories when modifying this product. A
failure to follow this warning could result in electrical
shock, fire, personal injury, or death.
For high-altitude installation, the high-altitude conversion kit must
be installed at or above 5500 ft above sea level.
For accessory installation details, refer to applicable installation
literature.
NOTE: Remove all shipping brackets and materials before oper-
ating furnace.
I. LOCATION
A. General
CAUTION: DO NOT install furnace in a corrosive or
contaminated atmosphere. Make sure all combustion and
circulating air requirements are followed.
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 systems. 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 construc-
tion process.
Excessive exposure to contaminated combustion air will
result in safety and performance related problems.
This furnace must be installed so electrical components are
protected from water.
Locate furnace as near to center of air distribution system and
chimney or vent as possible. The furnace should be installed as
level as possible.
When furnace is installed so that supply ducts carry air to areas
outside space containing furnace, the return air must also be
handled by a duct(s) sealed to furnace casing and terminating
outside space containing 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. The furnace
may be installed on combustible flooring when installed with
accessory downflow subbase, which is available from your dis-
tributor or branch when required.
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 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-cooling position.
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.
A99093
FRONT
RETURN AIR
MAX 85°F MIN 55°F
°F °F
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