Self-checking safety switch control circuit

Details Self-checking safety switch control circuit Self-checking safety switch control circuit

1980-11-18

1983-09-13

Jones, Larry

Combustion

Timer, programmer, retarder or condition responsive control

With test circuit checking or analyzing flame sensing...

431 6, 431 26, 126285B, 126116A, 236 1G, 236 15C, 340584, F23N 300, F23Q 500

Patent

active

044039425

ABSTRACT:
The present invention relates to a self-checking safety switch control circuit for a power combustion system. The circuit comprises a safety switch, a combustion blower relay, a thermal pilot switch, and a fuel supply system. The safety switch operates to detect flow through the combustion system. The safety switch either operates the pilot switch directly or operates the fuel supply system directly to shut down the system if no flow through the combustion system is detected. The circuit has a self-checking feature because combustion cannot be initiated in a subsequent cycle of the system if the safety switch remains in the proven condition from the previous combustion cycle.

REFERENCES:
patent: 1677295 (1928-07-01), Rogers et al.
patent: 2157710 (1939-05-01), Lake
patent: 2704571 (1955-03-01), Reichelderfer
patent: 3482922 (1969-12-01), Blackett
patent: 3887325 (1975-06-01), Finger et al.
patent: 4189296 (1980-02-01), Hayes

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