G - Physics – 05 – D
Patent
G - Physics
05
D
341/21
G05D 23/19 (2006.01) F23N 1/06 (2006.01) F23N 5/22 (2006.01)
Patent
CA 1094665
STACK DAMPER CONTROL SAFETY INTERLOCK WITH LOCKOUT PREVENTION Abstract of the Disclosure: A control arrangement for a heating system including a furnace having a fuel-fired burner apparatus and a vent stack with a motor driven damper plate for opening and closing the stack, includes an interlock switch which provides a safety interlock between fuel supply valves of the system and first and second limit switches which control the energization of a drive motor for the damper plate and effect energization of the fuel supply valves of the system, permitting the fuel valves to operate only when the damper plate is in the open position and preventing energization of the fuel valves in the event of a malfunction of either of the limit switches. The interlock switch also permits recycling of the system in the event of a momentary power interruption. The control arrangement may include a stack mounted heat sensor switch which interrupts the energizing path for the fuel supply valves in the absence of heat from the main burner within a predetermined interval of time.
279048
Johnson Controls Inc.
Osler Hoskin & Harcourt Llp
LandOfFree
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