Bradford White 55X-80B-3X - Manual (Page 10)

10
Combustion Air Supply
Provide adequate air for combustion and ventilation. An insufficient supply of
air will cause recirculation of combustion products resulting in air
contamination that may be hazardous to life. Such a condition often will result
in a yellow, luminous burner flame, causing carboning or sooting of the
combustion chamber, burners and flue tubes with possible damage to the
water heater. When an exhaust fan is installed in the same room with a water
heater, sufficient openings for air must be provided in the walls. Undersized
openings will cause air to be drawn into the room through the chimney,
causing recirculation of combustion products.
Confined Spaces
Confined spaces are spaces defined as having less than 50 ft.
3 /1000 BTU
(1.41m 3 /.29kw) per hour.
Unconfined Spaces
In unconfined spaces in buildings, infiltration may be adequate to provide air
for combustion, ventilation and dilution of flue gases. However, in buildings of
tight construction (for example, weather stripping, heavily insulated, caulked,
vapor barrier, etc.), additional air may need to be provided using the methods
described above under CONFINED SPACES: All Air from Outdoors or
SPECIALLY ENGINEERED INSTALLATIONS.
WARNING
Liquefied petroleum gases/propane gases are heavier than air and will
remain at floor level if there is a leak. Basements, crawl spaces, closets
and areas below ground level will serve as pockets for accumulation of
leaking gas. Before lighting, smell all around the appliance area for
gas. Be sure to smell next to the floor.
IF YOU SMELL GAS:
 Do not try to light any appliance.
 Do not touch any electric switch; do not use any telephone in your
building.
 Immediately call your gas supplier from a neighbor’s telephone.
Follow the gas supplier’s instructions.
 If you cannot reach your gas supplier, call the fire department.
DO NOT OPERATE APPLIANCE UNTIL LEAKAGE IS CORRECTED!
IMPORTANT
The flow of combustion and ventilating air must not be obstructed.