Burner control with interrupted ignition

G - Physics – 05 – D

Patent

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341/20

G05D 23/27 (2006.01) F23N 5/08 (2006.01) F23N 5/20 (2006.01)

Patent

CA 1088182

BURNER CONTROL WITH INTERRUPTED IGNITION ABSTRACT OF THE DISCLOSURE The interrupted ignition system is used in a burner control circuit having a primary side which has as its primary function the application of a line voltage to the burner motor and the fuel igniter and a secondary side, which is responsive to a thermostat, and includes a light sensitive element for detecting a flame at the burner plus a current responsive element which in com- bination with a circuit breaking switch in the primary functions as a circuit breaker for disconnecting the igniter and motor from the line voltage under certain conditions. The igniter is controlled by a triac switch in the primary which in turn is responsive to an optical coupler connected to the se- condary of the burner control circuit. When the thermostat contacts are closed, thereby indicating a call for heat, the optical coupler will cause the triac to switch on, resulting in current flow through the igniter. With the detection of a flame by the flame cell, the optical coupler will be shut off, resulting in the switching off of the triac and the discontinuation of current through the igniter, thus permitting a reduction in the overall electrical power consumption of the system. In the event the flame should be lost, the optical coupler will again switch on the igniter until either a flame is de- tected or the circuit breaker times out and the primary side is disconnected from the line voltage. -1-

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