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Apparatus for regulating heater cycles to improve forced-air heating system efficiency

  • US 5,971,284 A
  • Filed: 03/25/1998
  • Issued: 10/26/1999
  • Est. Priority Date: 03/25/1997
  • Status: Expired due to Term
First Claim
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1. A method of regulating cycles in a forced air heating system having a burner, a heat exchanger, and a fan, said method comprising the steps of:

  • making a plurality of measurements of a temperature of air output from the heat exchanger;

    observing a temperature measurement of the plurality, after the burner has turned on;

    initializing a confirmation interval when two consecutive temperature measurements of the plurality are substantially the same;

    observing a temperature measurement of the plurality at an end of the confirmation interval;

    if the temperature measurement at the end of the confirmation interval is substantially the same as the two consecutive temperature measurements;

    recording said same temperature measurement as a steady state temperature; and

    interrupting firing of the burner for an interrupt interval;

    said interrupt interval being insufficient to allow the heat exchanger'"'"'s temperature to fall below a useful value.

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