Automatic temperature and humidity regulation – Combined draft and check control
Patent
1975-12-03
1977-04-12
Wayner, William E.
Automatic temperature and humidity regulation
Combined draft and check control
236 78C, 110163, 318468, F24D 500
Patent
active
040170241
ABSTRACT:
A stack damper control arrangement for use in a heating system including a furnace having a fuel-fired burner apparatus and a vent stack for conducting combustion products away from the burner apparatus and a damper plate pivotally mounted within the stack and movable between a fully open and a fully closed position, includes a reversible drive motor which is energizable in response to a request for heat to drive the damper plate to the open position, a first limit switch operated when the damper plate reaches the open position to effect the deenergization of the motor, the motor being reenergized at the end of the heating cycle to drive the damper plate to the closed position, and a second limit switch operated when the damper plate reaches the closed position to effect the deenergization of the motor. The damper control arrangement is described with reference to a heating system including a gas fired burner and redundant gas valves wherein operation of a first one of the gas valves is effected through operation of the first limit switch and thus is conditional upon the damper being fully open, and wherein the supply of fuel to the second valve is conditional upon the operation of the first valve.
REFERENCES:
patent: 2155642 (1939-04-01), Dewey
patent: 2172487 (1939-09-01), Wasserlein, Jr.
patent: 2226510 (1940-12-01), Grant
patent: 2654061 (1953-09-01), Gille
Grostick Martin Coiner
Hayes Thomas Edward
Johnson Controls Inc.
Wayner William E.
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