Variable speed inducer motor control method

Details Variable speed inducer motor control method Variable speed inducer motor control method

1993-07-08

1994-07-26

Dority, Carroll B.

Stoves and furnaces

Hot-air furnaces

Compressed air

126116A, F24H 302

Patent

active

053319443

ABSTRACT:
In a fixed-firing rate induced draft furnace, having a heat exchanger and an integrated control inducer motor, an improved method of controlling excess air comprising the steps of: providing at least one pressure switch that is responsive to a preselected pressure drop level in the heat exchanger, the pressure drop level being selected so as to be commensurate with a theoretically desired excess air level under firing operating conditions; accelerating the integrated control inducer motor until the pressure switch closes and thereupon recording a first motor speed and a first current level; calculating a first torque value based on the first motor speed and the first current level; and regulating torque applied to the integrated control inducer motor in accordance with the first torque value.

REFERENCES:
patent: 4703747 (1987-11-01), Thompson
patent: 4729207 (1988-03-01), Dempsey

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