Excess air control

Details Excess air control Excess air control

1986-09-17

1987-11-03

Jones, Larry

Stoves and furnaces

Hot-air furnaces

Feeding air

431 2, 431 3, 236 1B, 236 15C, 165 16, 165 31, F24H 300

Patent

active

047037474

ABSTRACT:
Method and apparatus for maintaining excess air control in a gas furnace. A pressure switch is placed across a heat exchanger to indicate when, while accelerating the inducer motor speed during purging operation, the pressure drop reaches a predetermined level. When that occurs, the motor speed is sensed and recorded. When the furnace is subsequently fired, the desired inducer motor speed is obtained by modifying the recorded motor speed on a correction factor derived from empirical data obtained from a gas furnace operating under selective variable conditions.

REFERENCES:
patent: 2666584 (1954-01-01), Kliever
patent: 3284615 (1966-11-01), Yetter
patent: 4174941 (1979-11-01), Parkes
patent: 4406397 (1983-09-01), Kamata et al.

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