US 11,988,426 B2
Refrigerant charging method
Takuro Yamada, Osaka (JP); Atsushi Yoshimi, Osaka (JP); Eiji Kumakura, Osaka (JP); Ikuhiro Iwata, Osaka (JP); and Shun Ohkubo, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Appl. No. 17/280,619
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
PCT Filed Sep. 20, 2019, PCT No. PCT/JP2019/037049
§ 371(c)(1), (2) Date Mar. 26, 2021,
PCT Pub. No. WO2020/066922, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 2018-184329 (JP), filed on Sep. 28, 2018; application No. 2018-184330 (JP), filed on Sep. 28, 2018; application No. 2018-184331 (JP), filed on Sep. 28, 2018; and application No. 2018-184332 (JP), filed on Sep. 28, 2018.
Prior Publication US 2021/0348816 A1, Nov. 11, 2021
Int. Cl. D21F 1/00 (2006.01); F25B 13/00 (2006.01); F25B 45/00 (2006.01); F25B 49/02 (2006.01); F25B 40/00 (2006.01); F25B 41/24 (2021.01); F25B 43/00 (2006.01)
CPC F25B 45/00 (2013.01) [F25B 13/00 (2013.01); F25B 49/02 (2013.01); F25B 40/00 (2013.01); F25B 41/24 (2021.01); F25B 43/003 (2013.01); F25B 2313/0233 (2013.01); F25B 2345/001 (2013.01); F25B 2345/003 (2013.01); F25B 2345/007 (2013.01); F25B 2400/12 (2013.01); F25B 2400/19 (2013.01); F25B 2500/221 (2013.01); F25B 2600/2513 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A refrigerant charging method of recovering a refrigerant and charging the refrigerant to a second heat source unit, the refrigerant being included in a first heat source unit of an already installed refrigeration cycle apparatus in which a refrigeration cycle is to be performed by the refrigerant that circulates, the method comprising:
recovering a first refrigerant from the already installed refrigeration cycle apparatus and obtaining a recovered refrigerant; and
charging the recovered refrigerant and further charging a second refrigerant whose composition differs from a composition of the recovered refrigerant to the refrigeration cycle apparatus that includes the second heat source unit.