Invention Grant
- Patent Title: Method to avoid fan cycling during low ambient operation
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Application No.: US16704449Application Date: 2019-12-05
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Publication No.: US11353252B2Publication Date: 2022-06-07
- Inventor: David Mackey , Aylan Him , Zer Kai Yap
- Applicant: Lennox Industries Inc.
- Applicant Address: US TX Richardson
- Assignee: Lennox Industries Inc.
- Current Assignee: Lennox Industries Inc.
- Current Assignee Address: US TX Richardson
- Agency: Baker Botts L.L.P.
- Main IPC: F25B49/00
- IPC: F25B49/00 ; F25B49/02 ; F24F1/38 ; F25B6/02 ; F25B39/00 ; F24F110/12 ; F24F140/12 ; F25B39/04

Abstract:
A method of controlling an HVAC circuit, comprises allowing refrigerant to circulate within the HVAC circuit, wherein the HVAC circuit comprises an evaporator coil, a condenser coil, at least one fan configured to provide airflow to the condenser coil, at least one expansion valve, and at least one compressor. The method continues by receiving a temperature measurement and determining based on the temperature measurement, a minimum fan speed configured to avoid pressure spikes within the condenser coil. The method concludes by sending a signal to the at the least one fan to direct the at least one fan to spin at a rate greater than or equal to the minimum fan speed when the measured temperature is less than a predetermined temperature, wherein, when the refrigerant circulates through the condenser coil, the minimum fan speed is greater than zero rotations per minute.
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