Gas furnace with variable speed draft inducer
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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Abstract
A method of controlling a variable speed draft inducer motor and fan in a gas furnace. The method comprises 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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Citations
9 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
sensing a transient condition;
establishing a first time period;
continuing to generate the status signal following the sensing of the transient condition until the expiration of the first time period;
determining if the transient condition still exists at the end of the expiration of the first time period; and
generating a fault signal if the transient condition still persists.
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Specification