14
Combustion Air
COMBUSTION AND VENTILATION AIR
1. IMPORTANT:
Air for combustion and ventilation must not
come from a corrosive atmosphere. Any failure due to corro-
sive elements in the atmosphere is excluded from warranty
coverage.
2. Combustion air must be free of acid forming chemicals; such
as sulphur, fluorine and chlorine. These elements are found in
aerosol sprays, detergents, bleaches, cleaning solvents, air
fresheners, paint and varnish removers, refrigerants and many
other commercial and household products. Vapors from these
products when burned in a gas flame form acid compounds.
The acid compounds increase the dew point temperature of
the flue products and are highly corrosive after they condense.
3. 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.
4. If combustion air is exposed to the following substances (but
not limited to the following), it should not be used and the fur-
nace may 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 curing and acid washing materials
Combustion air requirements are determined by whether the fur-
nace is in an open (unconfined) area or in a confined space such
as a closet or small room.
When the furnace is installed in the same space with other gas ap-
pliances, such as a water heater, be sure there is an adequate
supply of combustion and ventilation air for the furnace and the
other appliances. Do not delete or reduce the combustion air sup-
ply required by the other gas appliances in this space. See Z223.1,
National Fuel Gas Code (NFPA 54). An unconfined space must
have at least 50 cubic feet (volume) for each 1,000 BTUH of the
total input of all appliances in the space. If the open space contain-
ing the appliances is in a building with tight construction (contem-
porary construction), outside air may still be required for the
appliances to burn and vent properly. Outside air openings should
be sized the same as for a confined space.
IMPORTANT: ONLY THE CURRENT VENT INSTRUCTIONS
APPLY. All gas furnaces cannot be common-vented.
OVERTEMPERATURE SAFETY
SWITCHES
Furnaces are equipped with safety switches in the burner com-
partment to protect against over-temperature conditions caused
by inadequate combustion air supply. If a switch is tripped it must
be manually reset after clearing the fault condition which caused
it to open.
IMPORTANT:
This is not a direct vent furnace. Review venting
instructions before installing.
!
WARNING
THIS FURNACE AND ANY OTHER FUEL-BURNING APPLI-
ANCE MUST BE PROVIDED WITH ENOUGH FRESH AIR
FOR PROPER COMBUSTION AND VENTILATION OF THE
FLUE GASES. MOST HOMES WILL REQUIRE THAT OUT-
SIDE AIR BE SUPPLIED INTO THE FURNACE AREA. FAIL-
URE TO DO SO CAN CAUSE DEATH FROM CARBON
MONOXIDE POISONING.
!
WARNING
ADEQUATE FACILITIES FOR PROVIDING AIR FOR COM-
BUSTION AND VENTILATION MUST BE PROVIDED IN AC-
CORDANCE WITH SECTION 5.3, AIR FOR COMBUSTION
AND VENTILATION, OF THE NATIONAL FUEL GAS CODE,
ANSI, Z223.1 LATEST EDITION OR APPLICABLE PROVI-
SIONS FOR THE LOCAL BUILDING CODES, AND NOT
OBSTRUCTED SO AS TO PREVENT THE FLOW OF AIR TO
THE FURNACE.
COMBUSTION AIR REQUIREMENTS
!
WARNING
ALL FURNACE INSTALLATIONS MUST COMPLY WITH
THE NATIONAL FUEL GAS CODE AND LOCAL CODES TO
PROVIDE ADEQUATE COMBUSTION AND VENTILATION
AIR FOR THE FURNACE. FAILURE TO DO SO CAN CRE-
ATE HAZARDOUS CONDITIONS RESULTING IN PROP-
ERTY DAMAGE, BODILY INJURY OR DEATH FROM
SMOKE, FIRE OR CARBON MONOXIDE.
!
WARNING
DO NOT BYPASS, JUMPER, OR REMOVE ANY SAFETY
SWITCH FROM THE FURNACE CONTROL CIRCUIT. IF A
SAFETY SWITCH CAUSES THE FURNACE TO SHUT
DOWN OR OPERATE INTERMITTENTLY, IT IS AN INDICA-
TION OF A POTENTIAL SAFETY HAZARD THAT MUST BE
ADDRESSED BY A QUALIFIED TECHNICIAN, SERVICE
AGENCY OR THE GAS SUPPLIER. DO NOT RESET
SAFETY CONTROLS WITHOUT CORRECTIVE ACTION
AND/OR VERIFICATION OF PROPER SAFE OPERATION
BY A QUALIFIED INSTALLER, SERVICE AGENCY OR THE
GAS SUPPLIER.
REPLACE ANY SAFETY CONTROL COMPONENT ONLY
WITH IDENTICAL OEM REPLACEMENT PARTS
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