Excess air control

Details Excess air control Excess air control

F - Mech Eng,Light,Heat,Weapons

23

N

341/34

F23N 3/00 (2006.01) F23N 1/02 (2006.01) F24H 3/00 (2006.01)

Patent

CA 1282140

EXCESS AIR CONTROL ABSTRACT OF THE DISCLOSURE 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 subse- quently fired, the desired inducer motor speed is obtained by modifying the recorded motor speed by a correction factor derived from empirical data obtained from a gas furnace operating under selective variable conditions. Further, 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 respec- tive 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.

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