Interlock arrangement for a stack damper control

Details Interlock arrangement for a stack damper control Interlock arrangement for a stack damper control

G - Physics

05

D

341/21

G05D 23/19 (2006.01) F23N 1/06 (2006.01)

Patent

CA 1094664

INTERLOCK ARRANGEMENT FOR A STACK DAMPER CONTROL Abstract of the Disclosure A control arrangement for a heating system includ- ing a furnace having a fuel-fired burner apparatus and a vent stack with a motor driven damper plate pivotally mounted with- in the stack, includes a stack damper control circuit includ- ing first and second limit switches which permit energization of a drive motor in response to a request for heat, permitting the damper plate to be driven to an open position, and for energizing an interlock switch which prepares an energizing path for fuel supply valves of the system, the first limit switch being operated when the damper plate approaches the open position to complete the energizing path for the fuel supply valves prepared by the interlock switch, and the second limit switch deenergizing the motor when the damper plate is driven to the fully open position. The motor is reenergized at the end of the heating cycle to drive the damper plate to the closed position, and the second limit switch deener- gizes the motor when the damper plate reaches the closed position.

279017

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