10
THIS FURNACE AND ANY OTHER
FUEL-BURNING APPLIANCE MUST
BE PROVIDED WITH ENOUGH
FRESH AIR FOR PROPER
COMBUSTION AND VENTILATION
OF THE FLUE GASES. MOST
HOMES WILL REQUIRE THAT
OUTSIDE AIR BE SUPPLIED INTO
THE FURNACE AREA. FAILURE TO
DO SO CAN CAUSE DEATH FROM
CARBON MONOXIDE POISONING.
Adequate facilities for providing air for
combustion and ventilation must be
provided in accordance with section
5.3, Air for Combustion and
Ventilation, of the National Fuel Gas
Code, ANSI, Z223.1 latest edition or
CAN/CGA B149.1 and .2 or, applicable
provisions for the local building codes,
and not obstructed so as to prevent the
flow of air to the furnace.
OVERTEMPERATURE
SAFETY SWITCHES
This furnace is equipped with safety
switches in the control compartment to
protect against overtemperature
conditions caused by inadequate
combustion air supply. The switches
are located just above the burners on
the furnace center panel on upflow and
downflow models and also on each
side of the burners on
upflow/horizontal and horizontal “only”
models, and must be manually reset if
tripped. DO NOT jumper this switch. If
this switch should trip, a qualified
FIGURE 6
HORIZONTAL RETURN AIR DUCT
FIGURE 7
AIR FROM HEATED SPACE
furnace installer, service agency or the
gas supplier should be called to check
and/or correct for adequate combustion
air supply. If this unit is mounted in a
closet, the door must be closed when
making this check of the installation.
DO NOT reset the overtemperature
switch without taking corrective action
to assure that an adequate supply of
combustion air is maintained under all
conditions of operation.
Replace this switch only with the
identical replacement part.
IMPORTANT: Air for combustion and
ventilation must not come from a
corrosive atmosphere. Any failure due
to corrosive elements in the
atmosphere is excluded from warranty
coverage.
The following types of installation may
require OUTDOOR AIR for
combustion, due to chemical
exposures:
• Commercial buildings
• Buildings with indoor pools
• Furnaces installed in laundry rooms
• Furnaces in hobby or craft rooms
• Furnaces installed near chemical
storage areas.
Exposure to the following substances
in the combustion air supply may also
require OUTDOOR AIR for
combustion:
• Permanent wave solutions
• Chlorinated waxes and cleaners
• Chlorine-based swimming pool
chemicals
• Water softening chemicals
• De-icing salts or chemicals
• Carbon tetrachloride
• Halogen type refrigerants
• Cleaning solvents (such as
perchloroethylene)
• Printing inks, paint removers,
varnishes, etc.
• Hydrochloric acid
• Cements and glues
• Antistatic fabric softeners for clothes
dryers
• Masonry acid washing materials
COMBUSTION AND VENTILATION AIR
WARNING
!
FOUR ANGLE BRACKETS ARE SHIPPED WITH EACH
UNIT THAT CAN BE INSTALLED HORIZONTALLY. THESE
BRACKETS MAY BE USED TO SECURE THE RETURN
AIR DUCT TO A HORIZONTAL UNIT.
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