F - Mech Eng,Light,Heat,Weapons – 23 – N
Patent
F - Mech Eng,Light,Heat,Weapons
23
N
341/19, 158/57
F23N 5/02 (2006.01) F23N 1/06 (2006.01) F23N 3/08 (2006.01) F23N 5/20 (2006.01)
Patent
CA 1156325
FUEL IGNITION AND STACK DAMPER CONTROL CIRCUIT Abstract A control circuit for a fuel supply and ignition control system controls the operation of pilot and main valves of the system and of a motor which controls the positioning of a vent stack damper plate to normally close the vent stack and to open the vent stack at the start of each ignition cycle. At the start of each ignition cycle, a start relay is operated to energize the pilot valve and a spark generator for a trial for ignition interval defined by the excursion time of the damper plate as it is driven to the open position. When the pilot fuel is ignited, a flame sensing circuit oper- ates a flame relay which completes a holding path for the pilot valve and when the damper plate reaches the fully open position, limit switches connect the main valve to the holding path and deenergize the drive motor and the start relay. If a pilot flame is not sensed before the end of the trial for ignition period, one of the limit switches deenergizes the pilot valve, and the start relay prevents reenergization of the drive motor, locking out the system. The control circuit includes a relay check- ing arrangement whereby start-up is prevented if for any reason the flame relay is operated at the start of an ignition cycle.
365455
Johnson Controls Inc.
Osler Hoskin & Harcourt Llp
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