Gas flow controlled furnace flue damper

Details Gas flow controlled furnace flue damper Gas flow controlled furnace flue damper

F - Mech Eng,Light,Heat,Weapons

23

L

158/59

F23L 11/00 (2006.01)

Patent

CA 1093956

ABSTRACT OF THE DISCLOSURE A gas furnace employs an exhaust flue damper driven by an electric motor equipped with position indicating switches. A gas flow detector switch supported in the gas line has a vertical passage and a valve member gravity biased into a rest position in which it blocks gas flow through the passage. Fuel flow through the line creates a differential pressure on the valve, raising it above the rest position. Circuitry interconnecting the damper drive and position indicating switches and the gas flow switch with the furnace thermostat and the gas line control valve, posi- tions the damper in a closed position when there is no gas flow to the furnace and in an open position otherwise and prevents energization of the gas flow valve when the damper is closed.

318752

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