US 11,885,543 B2
Refrigerant system operation sequences for leak prevention
Tingcan Mi, Shanghai (CN); Hai Tian, Shanghai (CN); Hui Li, Shanghai (CN); and Chengwei Tang, Shanghai (CN)
Assigned to CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Appl. No. 15/734,219
Filed by Carrier Corporation, Palm Beach Gardens, FL (US)
PCT Filed Sep. 2, 2020, PCT No. PCT/US2020/049034
§ 371(c)(1), (2) Date Dec. 1, 2020,
PCT Pub. No. WO2021/046107, PCT Pub. Date Mar. 11, 2021.
Claims priority of application No. 201910841812.1 (CN), filed on Sep. 6, 2019.
Prior Publication US 2022/0196304 A1, Jun. 23, 2022
Int. Cl. F25B 49/02 (2006.01); F25B 47/02 (2006.01)
CPC F25B 49/02 (2013.01) [F25B 47/02 (2013.01); F25B 2500/221 (2013.01); F25B 2500/222 (2013.01); F25B 2500/27 (2013.01); F25B 2600/2519 (2013.01); F25B 2700/1933 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of shutting down or defrosting within a refrigeration system having a compressor, condenser, expansion valve and evaporator, the method, comprising:
initiating a shutdown process or a defrost process of the refrigeration system;
closing a first valve within a refrigerant circuit of the refrigeration system;
operating a compressor within the refrigerant circuit;
detecting a suction pressure within the refrigerant circuit;
closing a second valve within the refrigerant circuit of the refrigeration system when the suction pressure is below a threshold suction pressure; and
stopping operation of the compressor;
wherein the first valve is located within the refrigerant circuit between a condenser and an evaporator, and wherein closing the first valve stops flow of refrigerant from the condenser to the evaporator;
wherein the second valve is located within the refrigerant circuit between the compressor and a condenser, and wherein closing the second valve, when the suction pressure is below a threshold suction pressure, stops flow of refrigerant from the compressor to the condenser.