Combustion – Timer – programmer – retarder or condition responsive control – Sensor of first burner controls second burner – e.g. – pilot...
Patent
1988-08-23
1989-09-12
Focarino, Margaret A.
Combustion
Timer, programmer, retarder or condition responsive control
Sensor of first burner controls second burner, e.g., pilot...
431 60, 431 75, F23Q 908
Patent
active
048655392
ABSTRACT:
A control unit for a gas furnace that has an electrically operable pilot gas valve and an electrically operable main gas valve and a method of making the control unit are provided, the control unit comprising an electrical circuit having a gas valve section that comprises a silicon controlled rectifier and a first capacitor and a second capacitor so electrically interconnected together that the capacitors are adapted to be charged on each half wave cycle of a certain polarity of an alternative current source that is imposed on the circuit and that the second capacitor is adapted to discharge through a relay coil that controls the gas valve to energize that relay coil only when the silicon controlled rectifier conducts, the silicon controlled rectifier being adapted to conduct only when the first capacitor is discharged, another section of the electrical circuit being adapted to discharge the first capacitor only on each half wave cycle of the other polarity of the alternative current source.
REFERENCES:
patent: 3766441 (1973-10-01), Gray
patent: 4070143 (1978-01-01), Dietz
patent: 4269589 (1981-05-01), Matthews
patent: 4435150 (1984-03-01), Rippelmeyer
patent: 4626192 (1986-12-01), Geary
Focarino Margaret A.
Robertshaw Controls Company
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