System and method for controlling the operation of a primary bur

Details System and method for controlling the operation of a primary bur System and method for controlling the operation of a primary bur

1992-04-29

1994-01-11

Yeung, James C.

Combustion

Timer, programmer, retarder or condition responsive control

With test circuit checking or analyzing flame sensing...

431 70, 431 79, F23N 500

Patent

active

052775755

ABSTRACT:
Disclosed is an electronic control system for controlling the operation of an oil burner heating system. The control system comprises a relay circuit having first and second relays. When the relays are closed, an external power source is connected to an igniter and motor. The control system also comprises a relay contact monitor configured to detect whether the relays contacts are welded. The control system also comprises a relay control circuit adapted to energize the relays in response to the call for heat from the thermostat and a signal from the relay contact monitor indicative that the relay contacts are not welded. The relays are configured such that only one relay will open or close with power across its contacts. The control system further comprises an improved flame sense monitor adapted to quickly output signals indicative of flame or no flame when such conditions are present with sensitivity hysteresis and a feature to adjust such hysteresis.

REFERENCES:
patent: 3079982 (1963-03-01), Staring
patent: 3364971 (1968-01-01), Hayes
patent: 3514242 (1970-05-01), Collins, Jr.
patent: 3816053 (1974-06-01), Cade
patent: 4278419 (1981-07-01), Bechtel et al.

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