G - Physics – 05 – D
Patent
G - Physics
05
D
341/20
G05D 23/27 (2006.01) F23N 5/08 (2006.01) F23N 5/20 (2006.01)
Patent
CA 1083248
BURNER CONTROL SYSTEM WITH PRIMARY SAFETY SWITCH ABSTRACT OF THE DISCLOSURE The primary side of the control circuit includes a triac switch for applying a line voltage to the burner motor and igniter in response to a signal from a first optical coupler, and a circuit breaker responsive to a second optical coupler for disconnecting the primary from the line voltage. The low voltage or secondary side of the control circuit, which is responsive to a thermostat, contains a light sensitive element for detecting a flame at the burner and the light sources for both optical couplers and, as such, is effective to control both the triac and the circuit breaker. The secondary also contains an electrical timing circuit for causing the triac to shut the motor and igniter off when, a predetermined time after a call for heat by the thermostat has elapsed, a flame has not been detected in the furnace In addition, the burner control circuit includes a fail-safe capability for opening the circuit breaker if the triac has failed into a permanently closed condition and there is no call for heat or the burner flame has gone out, thereby pre- venting the system from overheating or filling with fuel. -1-
244916
George H. Riches And Associates
Scott Fetzer Company (the)
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