Gas valve relay redundant safety

Details Gas valve relay redundant safety Gas valve relay redundant safety

1987-09-10

1989-05-09

Scott, Samuel

Combustion

Timer, programmer, retarder or condition responsive control

With test circuit checking or analyzing flame sensing...

431 30, 431 18, 431 26, 431 29, F23Q 2300

Patent

active

048284840

ABSTRACT:
A fail safe redundancy circuit for controlling a gas valve relay in a gas fired furnace or similar burner is disclosed. The status of the relay contacts is monitored and if those contacts are in the position for enabling the gas valve prior to an ignition attempt, a gate is enabled to shunt the control side of a circuit breaking device such as a fuse to overload that device causing it to kick out or open and interrupt power to the circuit thus disabling the burner. The burner combustion chamber is purged of any accumulated gas after the circuit breaker has been opened.

REFERENCES:
patent: 3954383 (1976-05-01), Bryant
patent: 3958126 (1976-05-01), Bryant
patent: 4298334 (1981-11-01), Clark et al.
patent: 4395224 (1983-07-01), Cade
patent: 4496305 (1985-01-01), Bentz
patent: 4695246 (1987-09-01), Beilfoss et al.

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