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Automatic control of air delivery in forced air furnaces

  • US 6,000,622 A
  • Filed: 05/19/1997
  • Issued: 12/14/1999
  • Est. Priority Date: 05/19/1997
  • Status: Expired due to Fees
First Claim
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1. A furnace air delivery control apparatus for a forced air furnace having a heat exchanger, a fan, and a fan motor, comprising:

  • (a) temperature sensing means operatively coupled to the heat exchanger for sensing the temperature thereof and for generating sensor signals correlatable therewith;

    (b) signal conditioning means operatively coupled to the temperature sensing means for conditioning the sensor signals and generating conditioned temperature signals;

    (c) a controller operatively coupled to signal conditioning means, including means for utilizing the conditioned temperature signals to continuously determine speed adjustment factors for adjusting the speed of the fan motor so as to maintain a constant air delivery, and means for generating output signals correlatable with the speed adjustment factors; and

    (d) speed adjusting means operatively coupled to the controller and to the fan motor, for adjusting the speed of the fan motor in accordance with the output signals.

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