Over-ride circuit

Details Over-ride circuit Over-ride circuit

1986-12-17

1988-02-09

Tanner, Harry

Automatic temperature and humidity regulation

Hot-air furnace

Air and fire control

236 94, 431 20, F23N 100

Patent

active

047237031

ABSTRACT:
An emergency heat bypass arrangement for a furnace in which the normal controller path is supplemented by an alternate path through a relay subject to an emergency heat switch controlling the solenoid of the relay, and the relay includes additional contacts for keeping power on the solenoid even after the furnace high pressure switch changes contacts to provide heating when said controller has malfunctioned.

REFERENCES:
patent: 2322714 (1943-06-01), Kalischer
patent: 4299555 (1981-11-01), Kamberg
patent: 4421268 (1983-12-01), Bassett et al.
Hendrie et al, Control Engineering, "Reliability Still Means Backup" pp. 131-135, Sep. 1966.

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