A.O. Smith 120 trough 500 - Manual (Page 11)

BTR TANK TYPE HEATERS
SERVICE HANDBOOK
A.O. Smith Water Products Service Handbook
Irving, Texas ©2000 Training Department
10
CONTAMINATED AIR
Along with adequate make-up air, the quality of the air is important. Contaminants in
combustion air can lead to premature heater failure.
Vapors from bleaches, soaps,
waxes, salts, etc. are drawn into the combustion chamber with the make-up air and, once
fired, mix with water vapor in the gases to form extremely corrosive hydrochloric or
hydrofluoric acid and other corrosive byproducts.
AIR FOR COMBUSTION
Flammable Items
Flammable items, pressurized containers or any other potentially hazardous articles must
never be placed on or adjacent to the heater. Open containers of flammable material
should not be stored or used in the same room with the heater.