Combustion air supply – American Water Heater GAS-FIRED COMMERCIAL WATER HEATER User Manual
Page 16
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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 flames, causing carboning or sooting of the
burners and flue tubes with possible damage to the heater.
Confined Spaces
If the water heater is installed in a confined space (volume is less than 50
ft.
3
/1000 BTU (15 m
3
/0.29 kW) per hour of the total input rating of all gas
appliances in that space), air must be supplied through two permanent
openings. One opening shall be within 12 inches (30.5 cm) from the top of the
enclosure and one within 12 inches (30.5 cm) of the bottom. The openings
must be protected by metal louvers or 1/4” (6.4 mm) min. mesh metal screen.
The size of the openings are as follows.
1. If the openings communicate directly with an additional room(s) of
sufficient volume, each opening shall have a minimum free area opening of
1
in.
2
/1000 BTU (2.54cm
2
/0.29kW) per hour of the total input rating of all
gas appliances in the confined space, but not less than 100 in.
2
(254 cm
2
).
Installation (Combustion Air Supply) continued-
WARNING
Liquefied petroleum gases/propane gas 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 telephone in another
building. 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.
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