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Burner firing rate determination for modulating furnace

  • US 8,123,518 B2
  • Filed: 07/10/2008
  • Issued: 02/28/2012
  • Est. Priority Date: 07/10/2008
  • Status: Active Grant
First Claim
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1. A method of operating a forced air furnace comprising a variable burner firing rate burner and a controller, the controller configured to accept signals from a two-stage thermostat, the method comprising the steps of:

  • defining a first stage ON parameter based upon a length of time a W1 (first stage heat) ON signal is asserted by the two-stage thermostat during a current heating cycle;

    defining a second stage ON parameter based upon a length of time a W2 (second stage heat) ON signal is asserted by the two-stage thermostat during the current heating cycle;

    calculating a burner firing rate for the current heating cycle based, at least in part, on the first stage ON parameter and second stage ON parameter; and

    operating the variable rate burner at the calculated burner firing rate.

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