Combustion – Timer – programmer – retarder or condition responsive control – Sensor of first burner controls second burner – e.g. – pilot...
Patent
1980-05-19
1982-11-23
Jones, Larry
Combustion
Timer, programmer, retarder or condition responsive control
Sensor of first burner controls second burner, e.g., pilot...
431 42, 431 43, 431 53, F23Q 908
Patent
active
043603386
ABSTRACT:
There is disclosed a control system for a gas burner appliance having an interrupted pilot burner operation. The system employs serially-connected first and second (main) electromagnetic operated valves. The first valve has a dual coil construction with a hold coil which can retain the pilot valve open and a pick coil which, acting in concert with the hold coil, can move the first valve to its open position. The control system utilizes one double pole, double throw relay in circuit with a lockout switch, the voltage source, the thermostat switch, and the cold switch contact of the flame switch. The igniter and pick coil are in circuit to the normally open contact of the relay thus being deenergized after a flame is detected at the pilot burner. The coil of the main gas valve is in circuit with the voltage source, the thermostat switch, the normally closed contact of the relay and the hot contact of the flame switch. The hold coil of the first valve is in circuit with the voltage source and the thermostat switch. The system is also provided with a serially-connected lockout switch with its heater in the relay coil circuit. A protective fuse and fuse blowing circuit is also provided.
REFERENCES:
patent: 2269157 (1942-01-01), Levine
patent: 2755852 (1956-07-01), Andrews et al.
patent: 4077762 (1978-03-01), Matthews
patent: 4106889 (1978-08-01), Katchka
patent: 4255118 (1981-03-01), Katchka
patent: 4289476 (1981-09-01), Visos et al.
Jones Larry
Robertshaw Controls Company
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