US 11,754,328 B2
Method and system for the heat-pump control to reduce liquid refrigerant migration
Eric Berg, The Colony, TX (US); Wenqian Liu, Plano, TX (US); Umesh Gokhale, Irving, TX (US); Srini Natarajan, Carrollton, TX (US); and Jeff Mangum, Carrollton, TX (US)
Assigned to Lennox Industries Inc, Richardson, TX (US)
Filed by Lennox Industries Inc., Richardson, TX (US)
Filed on Jan. 26, 2023, as Appl. No. 18/101,724.
Application 18/101,724 is a continuation of application No. 17/102,660, filed on Nov. 24, 2020, granted, now 11,592,225.
Prior Publication US 2023/0175751 A1, Jun. 8, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. F25B 49/02 (2006.01); F25B 13/00 (2006.01)
CPC F25B 49/02 (2013.01) [F25B 13/00 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of mitigating liquid-refrigerant migration using a processor, the method comprising:
receiving one of a heating-demand call and an end-defrost call;
determining a requested compressor speed responsive to the receiving step;
comparing a requested compressor speed of a variable-speed compressor to a pre-defined threshold;
responsive to a determination that the requested compressor speed is not greater than the pre-defined threshold, operating the variable-speed compressor at the requested compressor speed;
wherein the operating step is performed for a pre-defined time period;
before expiration of the pre-defined time period, the comparing step is repeated;
responsive to a determination at the repeated comparing step that the requested compressor speed is greater than the pre-defined threshold, operating the variable-speed compressor at the first compressor speed that is less than the requested compressor speed; and
responsive to a determination at the repeated comparing step that the requested compressor speed is not greater than the pre-defined threshold, operating the variable-speed compressor at the requested compressor speed.