Combustion – With indicator or inspection means – Correlated with action of condition responsive burner control
Patent
1979-11-01
1981-11-10
Dority, Jr., Carroll B.
Combustion
With indicator or inspection means
Correlated with action of condition responsive burner control
431 20, 431 76, F23N 300
Patent
active
042995540
ABSTRACT:
An automatic vent damper and fuel valve control for a fluid fuel-fired furnace including an electrically-operated valve in the fuel line, a normally-open damper in the furnace vent having electrically-operated means for closing the damper, and a thermostat for sensing the temperature in the space being heated. A Hall-effect generator is employed for sensing the positions of the damper and for respectively providing signals in response thereto. A gas detector is provided for sensing the presence of hydrocarbon-containing gas in the region of the draft hood and vent of the furnace and for providing a gas-present signal in response thereto. A control is provided for the valve responsive to both the damper-open signal and the thermostat calling for heat to energize the valve to open the same, the valve control de-energizing the valve to close the same in response to the thermostat calling for termination of heating, or the damper-closed signal, or the gas-present signal. A control is provided for the damper closing means for energizing the same after a predetermined time delay responsive to the thermostat calling for termination of heating, the damper control de-energizing the damper closing means in response to the gas-present signal or the thermostat calling for heat.
REFERENCES:
patent: 3074644 (1963-01-01), Geniesse
patent: 4189296 (1980-02-01), Hayes
patent: 4239477 (1980-12-01), Hayes
Dority Jr. Carroll B.
H & M Distributors, Inc.
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