Hazardous Locations; Furnace Location And Application; Air For Combustion And Ventilation - Bryant 350AAV Installation, Start-Up, And Operating Instructions Manual

Fig. 17—Installation in a Garage
III. HAZARDOUS LOCATIONS
WARNING: FIRE,
DEATH HAZARD
Improper location or inadequate protection could result in
fire or explosion.
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, the furnace must be installed in accordance
with NFGC or NSCNGPIC. (See Fig. 17.)
→
IV. FURNACE LOCATION AND APPLICATION
A. Direct Vent (2-pipe) Application
Furnace may be located in a confined space without special
provisions for dilution or ventilation air.
B. Non-Direct Vent (1-pipe) Application
CAUTION: UNIT DAMAGE HAZARD
Failure to follow this caution may result in intermittent
unit operation.
Do not install furnace in a corrosive or contaminated
atmosphere. Make sure all combustion and circulating air
requirements are met.
Refer to the AIR FOR COMBUSTION AND VENTILATION
section for details.

AIR FOR COMBUSTION AND VENTILATION

Provisions for adequate combustion, ventilation, and dilution air
must be provided in accordance with:
• U.S. Installations: Section 8.3 of the NFGC, Air for Combus-
tion and Ventilation and applicable provisions of the local
building codes.
• Canadian Installations: Part 7 of the NSCNGPIC, Venting
Systems and Air Supply for Appliances and all authorities
having jurisdiction.
18-IN. MINIMUM
TO BURNERS
A93044
EXPLOSION, INJURY OR
→
WARNING: FURNACE CORROSION HAZARD
Failure to follow this warning could result in reduced
furnace component life.
Air for combustion must not be contaminated by halogen
compounds, which include fluoride, chloride, bromide,
and iodide. These elements could corrode heat exchang-
ers and shorten furnace life. Air contaminants are found
in aerosol sprays, detergents, bleaches, cleaning solvents,
salts, air fresheners, and other household products.
The following types of furnace installations may require OUT-
DOOR AIR for combustion due to chemical exposures:
• Commercial buildings
• Buildings with indoor pools
• Laundry rooms
• Hobby or craft rooms, and
• Chemical storage areas
If air is exposed to the following substances, it should not be used
for combustion air, and outdoor air may be required for combus-
tion:
• 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
All fuel-burning equipment must be supplied with air for fuel
combustion. Sufficient air must be provided to avoid negative
pressure in the equipment room or space. A positive seal must be
made between the furnace cabinet and the return-air duct to
prevent pulling air from the burner area and from draft safeguard
opening.
WARNING: CARBON MONOXIDE POISONING
HAZARD
Failure to follow this warning could result in peronal
injury or death.
The operation of exhaust fans, kitchen ventilation fans,
clothes dryers, attic exhaust fans or fireplaces could
create a NEGATIVE PRESSURE CONDITION at the
furnace. Make-up air MUST be provided for the ventila-
tion devices, in addition to that required by the furnace.
Refer to the Carbon Monoxide Poisoning Hazard warning
in the venting section of these instructions to determine if
an adequate amount of make-up air is available.
The requirements for combustion and ventilation air depend upon
whether or not the furnace is located in a space having a volume
of at least 50 cubic feet per 1,000 Btuh input rating for all gas
appliances installed in the space.
• Spaces having less than 50 cubic feet per 1,000 Btuh require
the OUTDOOR COMBUSTION AIR METHOD.
• Spaces having at least 50 cubic feet per 1,000 Btuh may use the
INDOOR COMBUSTION AIR, STANDARD or KNOWN-
AIR INFILTRATION METHOD.
—16—