Lennox Industries Inc.

Jeff Mangum

Yi Qu

Jon Douglas

H Gene Havard

Eric Berg

Umesh Gokhale

Wenqian Liu

Srini Natarajan

Mark W Olsen

John Nhu Tran

Bruce Perkins

Tim Brizendine

A method of mitigating liquid-refrigerant migration includes comparing a requested compressor speed of a variable-speed compressor to a pre-defined threshold and, responsive to a determination that the requested compressor speed is greater than the pre-defined threshold, operating the variable-speed compressor at a first compressor speed that is less than the requested compressor speed.

Method and system for the heat-pump control to reduce liquid refrigerant migration

A system and method are described that help in alleviating charge imbalance issues, especially in HVAC systems that are operable in both heating and cooling modes. In various embodiments a compensator is attached to the liquid line of an outdoor heat exchanger. A heater is attached to the compensator. During cooling operations the heater is turned on to help drive refrigerant out of the compensator. During heating operations the heater is turned off, allowing excess refrigerant to migrate to the compensator and alleviate high pressure in the system.

Method for solving charge imbalance in existing split heat pump

In various implementations, frost in a vapor compression system may be controlled. A property of a fan may be determined. A determination may be made whether a frost event and/or a nonfrost event has occurred based at least partially on the determined fan property.

Defrost control using fan data

An air conditioning system includes a compressor housing and a motor having fan blades rotatably coupled thereto and located within the compressor housing. The motor has a rotation sensor associated with it that is configured to sense a rotation of the fan blades. The system also includes a controller coupled to the motor that is configured to increase a torque of the motor when the rotation sensor indicates that the fan blades are not rotating after an on-command signal is received by the motor.

Fan motor controller for use in an air conditioning system

One aspect provides an air conditioning system that includes a compressor housing, a motor having fan blades rotatably coupled thereto and located within the compressor housing. The motor has a rotation sensor associated with it that is configured to sense a rotation of the fan blades. This embodiment further comprises a controller coupled to the motor and is configured to increase a torque of the motor when the rotation sensor indicates that the fan blades are not rotating after an on command signal is received by the motor.

An air conditioning system includes an exterior housing, and a motor having fan blades rotatably coupled thereto located within the exterior housing. The air conditioning system further includes a controller coupled to the motor and configured to, based upon climate conditions proximate the exterior housing, alternate between an ON cycle during which the fan blades are rotated and an OFF cycle during which the fan blades are not rotated.

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Argyle, TX, United States of America

Jeff Mangum