BTR TANK TYPE HEATERS
SERVICE HANDBOOK
A.O. Smith Water Products
Service Handbook
Irving, Texas ©2000
Training Department
9
INSUFFICIENT MAKE-UP AIR
BACKDRAFT
Insufficient make-up air is a major cause of combustion problems. One common example
is in a restaurant installation where exhaust vent equipment was not considered in sizing
make-up air requirements. This may result in air being backdrafted by the restaurant
exhaust equipment through the heater causing flue gas spillage, flame roll out, improper
combustion, inconsistent pilot operation, and/or erratic heater shut down.
Summary of Contents for 120 trough 500
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