Burner control system with secondary safety switch

Details Burner control system with secondary safety switch Burner control system with secondary safety switch

1975-02-12

1976-02-17

Favors, Edward G.

Combustion

Timer, programmer, retarder or condition responsive control

By combustion or combustion zone sensor

431 69, F23N 508

Patent

active

039389391

ABSTRACT:
The primary side of the burner control circuit, which has as its primary function the application of a line voltage to the burner motor and igniter, includes: a triac switch for applying the line voltage to the burner motor and igniter; in response to a first optical coupler; a circuit breaker switch for disconnecting the primary from the line voltage; and a light source for a second optical coupler. The secondary side of the burner control circuit, which is responsive to a thermostat, includes: a light sensitive element for detecting a flame at the burner; a light source for the first optical coupler; and a current responsive element which in combination with the circuit breaking switch in the primary functions as a circuit breaker. The first optical coupler responds to the thermostat to cause the triac switch to connect the motor and igniter to the line voltage and, if a flame is not sensed within a predetermined time by the light sensitive element, the circuit breaker will disconnect the motor from the line voltage. In addition, the second optical coupler serves as a safety device to disconnect the motor from the line voltage by means of the circuit breaker whenever the triac is in a shorted condition and the thermostat is not calling for heat.

REFERENCES:
patent: 3425780 (1969-02-01), Potts
patent: 3732433 (1973-05-01), Lourigan
patent: 3816053 (1974-06-01), Cade
patent: 3829276 (1974-08-01), Lenski et al.

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