Method and apparatus for detecting short circuited combustion ai

Details Method and apparatus for detecting short circuited combustion ai Method and apparatus for detecting short circuited combustion ai

1989-01-27

1991-05-14

Wayner, William E.

Combustion

Process of combustion or burner operation

Starting or shutdown procedure

431 90, 340644, F23N 522

Patent

active

050151720

ABSTRACT:
A method and apparatus detect a faulty air switch in a heating system which has an operation cycle comprising a plurality of operating periods. The air switch senses air flow in the heating system and causes air flow limit contacts to open when the air flow is outside a predetermined limit. The air flow is outside the predetermined limit during a first operating period of the operation cycle. A series circuit comprises the air flow limit contacts, coupled in series with other limit contacts between a limit sense terminal and an energized input terminal. The other limit contacts should be closed during the first operating period of the operation cycle. The limit sense terminal is sampled during the first operating period to determine whether the limit sense terminal is energized. Based on whether the limit sense terminal is energized, the air switch is determined to be faulty or operating properly.

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