Variable speed inducer motor control method

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

F - Mech Eng,Light,Heat,Weapons

23

N

F23N 3/08 (2006.01) F24H 9/20 (2006.01)

Patent

CA 2125760

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 characterized by 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.

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