Combustion – Timer – programmer – retarder or condition responsive control – With test circuit checking or analyzing flame sensing...
Patent
1981-07-24
1984-07-10
Scott, Samuel
Combustion
Timer, programmer, retarder or condition responsive control
With test circuit checking or analyzing flame sensing...
431 66, 431 69, 431 80, F23N 512
Patent
active
044590970
ABSTRACT:
A fuel burner control system including a valve for controlling the flow of fuel to a burner, a resistive heater element for igniting fuel, a power supply for supplying current to the heater element, a flame sensing circuit comprising an ac source for supplying ac voltage to the heater element, and a detector for producing an output signal only in response to the flow through the heating element of current rectified by the flame, a valve control circuit for maintaining the valve open in response to the output signal, and a coupling circuit interconnecting the heating element with both the power supply and the sensing circuit and adapted to prevent the flow of current therebetween. By utilizing a coupling circuit that prevents the flow of current between the power supply and the flame sensing circuit, the resistive heater element can be efficiently and alternately used both as a fuel igniting mechanism and as an electrode for deriving current rectified by flame at the burner.
REFERENCES:
patent: 3902839 (1975-09-01), Matthews
patent: 3955910 (1976-05-01), Matthews
patent: 4087229 (1978-05-01), Teichert et al.
patent: 4161387 (1979-07-01), Courier de Mere
patent: 4188181 (1980-02-01), Ripplemeyer et al.
patent: 4245977 (1981-01-01), Morese
patent: 4298335 (1981-11-01), Riordan et al.
Cunha Richard A.
Riordan William J.
Green Randall L.
Jarcho Harold G.
Kidde, Inc.
Scott Samuel
Toupal John E.
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