Modulating gas valve furnace control method

Details Modulating gas valve furnace control method Modulating gas valve furnace control method

1997-03-03

1999-01-19

Dority, Carroll B.

Stoves and furnaces

Hot-air furnaces

Liquid or gaseous fuel

126116R, 431 20, 1374925, F24H 300

Patent

active

058604111

ABSTRACT:
A furnace control apparatus is described wherein a flow of gas into a burner assembly is directly dependent on an indicia of burner combustion air airflow, such as heat exchanger pressure drop. According to one embodiment of the invention, a first communication fluid line is interposed between a gas valve regulator and a heat exchanger at a first point, and a second communication fluid line is interposed between a gas valve regulator a heat exchanger at a second point. The main valve of the gas valve is responsive to the pressure differential between the first and second points so that a flow of gas into a furnace burner assembly is commensurate with a present flow level of combustion air.

REFERENCES:
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patent: 4385887 (1983-05-01), Yamamoto et al.
patent: 4482313 (1984-11-01), Cheetham
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patent: 4708636 (1987-11-01), Johnson
patent: 5520533 (1996-05-01), Vrolijk
patent: 5601071 (1997-02-01), Carr et al.
patent: 5630408 (1997-05-01), Versluis
patent: 5642724 (1997-07-01), Raleigh

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