A. O. Smith Water Products Company
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, salts, etc. are drawn into the combustion chamber
with the make up air and, once fired, mix with water vapor in the gasses to form extremely corrosive hydrochlo-
ric or hydrofluoric acid an other corrosive byproducts. Dust drawn in may build up on the blower or clog the
main burner ports. Also, be certain to examine the exterior area around the air intake of a direct vent installa-
tion for these contaminants.
AIR FOR COMBUSTION
FLAMMABLE ITEMS
Flammable items or 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 or in the area of the exterior air intake of a direct vent installation. Direct venting does not
eliminate the need to remove flammable or corrosives from the area surrounding the heater.
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Summary of Contents for BTH 120
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