US 11,994,323 B2
Refrigerant charging method, heat source unit, and renewed refrigeration cycle apparatus
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. 17/280,406
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
PCT Filed Sep. 20, 2019, PCT No. PCT/JP2019/037050
§ 371(c)(1), (2) Date Mar. 26, 2021,
PCT Pub. No. WO2020/066923, 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 2022/0003469 A1, Jan. 6, 2022
Int. Cl. F25B 45/00 (2006.01); F25B 13/00 (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)] 16 Claims
OG exemplary drawing
 
1. A refrigerant charging method of charging a refrigerant to a refrigerant circuit in which a refrigeration cycle is to be performed by a circulating refrigerant, the refrigerant circuit being configured by connecting a heat source unit and a utilization unit to each other, the method comprising:
(a) charging a first refrigerant to the heat source unit before connecting the heat source unit to the utilization unit to configure the refrigerant circuit; and
(b) connecting the heat source unit to the utilization unit and additionally charging a second refrigerant that differs from the first refrigerant to the refrigerant circuit to obtain the circulating refrigerant that includes the second refrigerant and the first refrigerant that is charged in the heat source unit, wherein
the second refrigerant is a refrigerant recovered from another refrigerant circuit that previously connected another heat source unit that is different from the heat source unit to the utilization unit.