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Gas furnace with variable speed draft inducer

  • US 6,257,870 B1
  • Filed: 12/21/1998
  • Issued: 07/10/2001
  • Est. Priority Date: 12/21/1998
  • Status: Expired due to Term
First Claim
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1. A method of controlling a variable speed draft inducer motor and fan in a gas furnace comprising the steps of:

  • detecting a first fault driving the motor to a maximum operating range;

    detecting a second fault forcing the motor to operate towards a minimum operating range; and

    generating a fault signal if both faults are detected substantially simultaneously.

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