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US 6,257,870 B1Granted
Gas furnace with variable speed draft inducer
AssigneeAmerican Standard International Inc.
InventorsG. Jeffrey Hugghins, Robert W. Helt, Leonard W. Holmes, James T. Vershaw, Timothy W. Storm
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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.
Claims9
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.
1 more element
Dependencies are inferred from the claim text.