Backup trial for ignition timer

Details Backup trial for ignition timer Backup trial for ignition timer

1990-09-19

1992-07-21

Price, Carl D.

Combustion

Timer, programmer, retarder or condition responsive control

Shutdown by sensed absence of flame in proving period

431 78, 431 18, 431 75, F23N 520

Patent

active

051318377

ABSTRACT:
A gas valve control system including a microprocessor, a first relay, a second relay, flame sensor and a timer. The timer is connected to the switch which is connected in the power supply path of the second relay. The second relay is connected to the valve. Activation of the first relay causes activation of the second relay causing the valve to open. Also, activation of the first relay causes the timer to operate. The flame sensors then must sense flame or else the microprocessor will deactivate the first relay. If the microprocessor fails to deactivate the first relay, the timer causes the switch to open and break the power supply path to the second relay. This in turn causes the valve to close.

REFERENCES:
patent: 4303385 (1981-12-01), Rudich,Jr. et al.
patent: 4507702 (1985-03-01), Grewe
patent: 4836770 (1989-06-01), Geary

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