Controller for a hvac system having a calibration algorithm
AssigneeLennox Industries Inc.
InventorsJonathan Douglas, Alan Bennett, Farhad Abrishamkar, Paul Foden, Stephen Walter, Herman M. Thomas, Krishna Doddamane
Life of this patent
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Abstract
This disclosure presents a controller for use with a HVAC system that has a program stored therein that is configured to relate a torque of a fan motor of a HVAC system with an airflow rate of the HVAC system, such that a selected airflow rate will cause the fan motor to operate at a torque that will produced the selected airflow rate.
Claims20
A controller for a heating, ventilating and cooling (HVAC) system, comprising:
- a control board;
- a microprocessor located on and electrically coupled to said control board;
- and
- a memory coupled to said microprocessor and located on and electrically coupled to said control board and having a program stored thereon, said program configured to relate an operational fan motor command of a HVAC system with an airflow rate of said HVAC system, such that a selected airflow rate will cause a fan motor of said HVAC system to operate based on said operational fan motor command to produce said selected airflow rate.
A Heat Ventilation Air Conditioning (HVAC) system, comprising:
- a housing having openings for exhaust air, ventilation air, return air and supply air, said housing further having an exhaust fan, an economizer, a heat exchanger, an indoor fan, a heating element and a primary HVAC controller located within said housing;
- and
- a secondary controller configured to relate an operational fan motor command with an airflow rate of said HVAC system, such that a selected airflow rate will cause a fan motor of said HVAC system to operate based on said operational fan motor command to produce said selected airflow rate.
A computer program product, comprising a non-transitory computer usable medium having a computer readable program code embodied therein, said computer readable program code adapted to be executed to implement a method of measuring and managing an airflow rate of a heating, ventilating and air conditioning (HVAC) system, said method comprising:
- relating an operational fan motor command of said HVAC system with an airflow rate of said HVAC system, such that a selected airflow rate will cause a fan motor of said HVAC system to operate based on said operational fan motor command to produce said selected airflow rate;
- and
- building a calibration table during initial operation of an installed HVAC system, said calibration table relating a given operational fan motor command to a given airflow rate.
Dependencies are inferred from the claim text.