Combustion – Timer – programmer – retarder or condition responsive control – With test circuit checking or analyzing flame sensing...
Patent
1974-09-23
1976-05-11
Favors, Edward G.
Combustion
Timer, programmer, retarder or condition responsive control
With test circuit checking or analyzing flame sensing...
431 66, 431 71, F23Q 300
Patent
active
039559106
ABSTRACT:
A pilot fuel ignition system including an ignition circuit for generating sparks for igniting fuel emanating from a pilot burner to establish a pilot flame, a control circuit responsive to the ignition circuit to operate a pilot valve to supply fuel to the pilot burner, and a sampling circuit controlled by the control circuit to maintain the pilot valve operated and to operate a main burner valve to supply fuel to a main burner for ignition by the pilot flame. A flame sensing circuit enabled whenever a pilot flame is established normally disables the ignition circuit, but periodically enables the ignition circuit to test the operability of the ignition circuit. Failure of the ignition circuit to operate results in the disabling of the sampling circuit causing shutoff of the pilot and main burner valves. Also, a warp switch energized whenever the pilot flame is extinguished effects shutoff of the pilot valve interrupting the supply of fuel to the pilot and the main burners.
REFERENCES:
patent: 3441356 (1969-04-01), Walbridge
patent: 3767354 (1973-10-01), Wright
patent: 3914092 (1975-10-01), Matthews
Favors Edward G.
Johnson Service Company
Joyce Harold
LandOfFree
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