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Furnace control system and method

  • US 10,094,591 B2
  • Filed: 08/15/2012
  • Issued: 10/09/2018
  • Est. Priority Date: 08/15/2011
  • Status: Active Grant
First Claim
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1. A method for operating a furnace system, the method comprising:

  • receiving a start instruction at a controller;

    initiating a start sequence comprising;

    starting an inducer fan operative to induce an air flow through a burner assembly, a heat exchanger portion and a collector portion;

    comparing an air pressure to a first threshold value;

    starting a furnace ignition sequence including providing fuel to the burner assembly, mixing the fuel with induced air, igniting the fuel and air mixture and starting an ignition timer responsive to determining that the air pressure is above the first threshold value;

    determining whether the ignition timer has expired;

    determining whether the air pressure is above a second threshold value responsive to determining that the ignition timer has expired; and

    stopping the provision of fuel to the burner assembly responsive to determining that the air pressure is not above the second threshold value;

    wherein the first threshold value is less than the second threshold value.

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