Excess air control with dual pressure switches

Details Excess air control with dual pressure switches Excess air control with dual pressure switches

1986-09-17

1988-03-08

Jones, Larry

Stoves and furnaces

Hot-air furnaces

Feeding air

126110R, 126116A, 431 12, F24H 300

Patent

active

047292075

ABSTRACT:
A method and apparatus for maintaining the desired level of excess air in a two stage gas furnace system. Low and high pressure switches are placed across the heat exchanger and are successively closed, as the inducer motor accelerates during purging, when the pressure drop reaches the respective theoretically desired low and high firing pressure drop levels. As the switches are closed, the inducer motor speeds are sensed and recorded, with a ratio of the two then being calculated. After firing, the ratio is then directly applied to a desired high firing motor speed to obtain the desired low firing motor speed.

REFERENCES:
patent: 4411385 (1983-10-01), Lamkewitz
patent: 4538760 (1985-09-01), Kobayashi
patent: 4562954 (1986-01-01), Kajita

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