Airflow switch checking circuit

Details Airflow switch checking circuit Airflow switch checking circuit

1990-03-19

1991-02-12

Dority, Carroll B.

Combustion

Timer, programmer, retarder or condition responsive control

Control of purger, of scavenger or of combustion start-up...

431 90, F23H 500

Patent

active

049920405

ABSTRACT:
A burner system has a control system which operates to prevent startup of the burner if an airflow switch indicates presence of combustion air flow before startup of a blower which provides the air flow. If the airflow switch later indicates absence of air flow before startup, then startup can proceed normally without operator intervention. Power for startup is supplied through the normally closed contacts of a safety relay. The winding of the safety relay receives power through the airflow switch. When the airflow switch is closed the safety relay winding is energized, opening the normally closed safety relay contacts and thereby blocking burner system startup, but only unit the airflow switch opens.

REFERENCES:
patent: 4243372 (1981-01-01), Cade
patent: 4842510 (1989-06-01), Grunden et al.

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