Combustion – Timer – programmer – retarder or condition responsive control – Shutdown by sensed absence of flame in proving period
Patent
1979-10-02
1981-11-10
Hix, L. T.
Combustion
Timer, programmer, retarder or condition responsive control
Shutdown by sensed absence of flame in proving period
431 73, 431 74, 307117, F23Q 912
Patent
active
042995574
ABSTRACT:
A circuit for safely admitting fuel to a burner, igniting the fuel, detecting the presence of flame at the burner, and preventing the escape of unburned fuel from the burner if ignition is not accomplished or the flame is interrupted. An initiation circuit operates a control signal generator during a time delay period and a valve operating circuit opens a fuel valve to admit fuel to a burner. An igniter circuit is operated in response to energization of the valve operating circuit to produce sparks for ignition of the fuel. A flame detector circuit powered by the valve operating circuit detects the presence of flame and, in response, the operation of the control signal generator is maintained and the operation of the ignition circuit is interrupted. The operation is fail-safe, the detection of flame is reliable despite power supply variations, and no power supply transformer or valve operating relay is required.
REFERENCES:
patent: 3671815 (1972-06-01), Eberle et al.
patent: 3727073 (1973-04-01), Cade
patent: 4019854 (1977-04-01), Carlson et al.
patent: 4168947 (1979-09-01), Matthews
Dwyer James L.
Harper-Wyman Company
Hix L. T,.
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