Patent
Damper construction for a gas fired combustion apparatus
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TLDR
A thermally controlled damper construction for a gas fired combustion apparatus, such as a furnace, is described in this article, where one edge of the damper is recessed to provide venting of gases generated by operation of the pilot light during periods when the furnace is not operating.Abstract:
A thermally controlled damper construction for a gas fired combustion apparatus, such as a furnace. The damper has a generally eliptical shape and is mounted on a shaft in the stack or flue for pivotal movement from a closed position, where the damper is located at an angle of approximately 45° with respect to the axis of the stack, to a full open position. One edge of the damper is recessed to provide a vent opening between the damper and the stack and permit venting of gases generated by operation of the pilot light during periods when the furnace is not operating. The damper is moved between the closed and open positions by a bi-metallic element which is located upstream of the damper and connected to the damper by a linkage. When the furnace is operated, the increase in flue temperature will operate the bi-metallic element to move the damper to the open position. A temperature responsive safety switch is located upstream of the damper adjacent the vent opening and is operably connected to the gas supply of the furnace. In the event the damper does not open when the furnace is operated, the safety switch will shut off the gas supply to the furnace.read more
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References
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Patent
Safety control for furnace burner
Edward R. Kmetz,George E. Joumas +1 more
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