F - Mech Eng,Light,Heat,Weapons – 23 – Q
Patent
F - Mech Eng,Light,Heat,Weapons
23
Q
341/20
F23Q 9/08 (2006.01) F23N 5/02 (2006.01) F23Q 9/12 (2006.01)
Patent
CA 1100600
ABSTRACT OF THE DISCLOSURE 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 open- ing of the safety switch is in the gate circuit 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 series with the first valve and controlling the flow of gas to the main burner, is opened.
304348
Borden Ladner Gervais Llp
Emerson Electric Co.
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