Programing burner control device

Claim 1

A programing burner control device adapted to be connected as part of a burner system which includes flame sensor means, ignition and fuel supply means, condition responsive interlocks, and initiating control means whereby said programing burner control device is adapted to be connected to a source of operating power when said interlocks and said control means are properly actuated, including: motor driven cam means and cam operated switch means with said switch means operated in a sequence to program said burner system in a predetermined operating mode; safety switch means including heater means and normally closed safety switch contacts with said heater means capable of opening said safety switch contacts upon said heater means being operatively energized for a period of time; load control relay means including A plurality of load control contacts with at least one of said control contacts controlling the energization of said motor driven cam means upon initiation of operation of said burner system; amplifier means and flame relay means wherein said amplifier means is adapted to be connected to said flame sensor means with said flame relay means normally operated in response to said flame sensor means detecting the presence of flame; said flame relay means including a normally open contact which when closed completes a circuit for energizing said safety switch heater means in a prepurge portion of said burner system operation; and said flame relay means further including a normally closed contact which when opened interrupts power to said motor driven cam means in a prepurge portion of said burner system operation; said flame relay means operation causing said programing burner control device to stop the operation of said motor driven cam means with the concurrent heating of said safety switch heater means in the event of operation of said flame relay means during said prepurge portion of operation to safely stop said burner system.