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US 2006/0130497 A1Published application
Method and control for testing air filter condition in HVAC system
AssigneeCarrier Corporation
InventorsPengju Kang, Thomas Radcliff, Mohsen Farzad, Alan Finn
Life of this patent
Estimating the term…
Abstract
A method and control for determining an air filter condition in an HVAC system forces a change in a motor speed for a fan for driving air through the air filter and into an environment to be conditioned. When the motor speed is changed, an expected change in temperature in the environment is monitored. If the actual change is not as expected, a determination may be made that the air filter is clogged.
Claims18
An HVAC system comprising:
- a heat exchanger to heat air to be delivered into an environment to be conditioned;
- a fan for driving air over said heat exchanger;
- an air filter for receiving air to be delivered into the environment and for removing impurities in the air, air being driven through said air filter by said fan;
- and
- a control for changing at least one variable within the HVAC system, and for monitoring a resultant change in another variable, said control being programmed to determine a condition of said air filter based upon said resultant change.
2 more elements
A control comprising:
- a control for changing at least one variable within an HVAC system, and for monitoring a resultant change in another variable, said control being programmed to determine the condition of an air filter based upon said resultant change.
A method of determining the condition of an air filter in an HVAC system comprising the steps of:
- (1) providing an HVAC system including a heat exchanger, a fan for driving air over the heat exchanger and into an environment to be conditioned, and an air filter for receiving and filtering air being delivered by said fan into said environment;
- (2) changing a system variable, and monitoring a resultant change in a second system variable, and determining the condition of said air filter based upon said resultant change.
Dependencies are inferred from the claim text.