Cycling pilot burner control system with safety timing

Details Cycling pilot burner control system with safety timing Cycling pilot burner control system with safety timing

1977-06-03

1978-08-01

Dority, Jr., Carroll B.

Combustion

Timer, programmer, retarder or condition responsive control

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

431 46, 431 69, 431 71, F23Q 908

Patent

active

041040163

ABSTRACT:
A gas burner control system including a main burner and a pilot burner for igniting the main burner wherein the pilot burner is ignited only when the thermostat is calling for heat and wherein a normally closed bimetal operated safety switch is effective to provide a trial ignition period for igniting the pilot burner. An electrical resistance heater for effecting opening of the safety switch is in the gate cicuit of a solid-state switch and is energized in the absence of pilot burner flame. The solid-state switch, when conducting, is effective to complete an electrical circuit through the safety switch to open a first valve and initiate gas flow to the pilot burner. When pilot burner flame exists, the resistance heater is de-energized, the first valve is held open by means including a switch responsive to gas pressure downstream from the first valve, and a second valve, fluidically in the series with the first valve and controlling the flow of gas to the main burner, is opened.

REFERENCES:
patent: 3488131 (1970-01-01), Myers et al.

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