Spark ignition system with positive suppression of spark when pi

Details Spark ignition system with positive suppression of spark when pi Spark ignition system with positive suppression of spark when pi

1986-09-22

1987-08-25

Scott, Samuel

Combustion

Timer, programmer, retarder or condition responsive control

Sensor of first burner controls second burner, e.g., pilot...

431 74, F23N 510

Patent

active

046890068

ABSTRACT:
A spark ignition system for a pilot flame uses a flame sensing rod to switch ac voltage from a spark generator to a main valve, thereby providing positive suppression of spark generation once the pilot flame is sensed. A main oscillator activated by a flame sensing signal is provided to operate a switch for this purpose. Should the pilot flame be extinguished, the switch automatically reverts to its first state, thereby closing the main valve and reactivating the spark generator. The entire system is operative only when ac voltage is present from a thermostat demanding heat. The pilot valve connected directly to the thermostat is open to emit gas whenever there is a demand for heat.

REFERENCES:
patent: 3986813 (1976-10-01), Hewit
patent: 4194875 (1980-03-01), Hewitt

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