US 12,235,027 B2
Refrigerant charging method
Takuro Yamada, Osaka (JP); Atsushi Yoshimi, Osaka (JP); Eiji Kumakura, Osaka (JP); and Ikuhiro Iwata, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Appl. No. 17/280,806
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
PCT Filed Sep. 20, 2019, PCT No. PCT/JP2019/037048
§ 371(c)(1), (2) Date Mar. 26, 2021,
PCT Pub. No. WO2020/066921, 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 2022/0003470 A1, Jan. 6, 2022
Int. Cl. F25B 45/00 (2006.01); F25B 13/00 (2006.01); F25B 43/00 (2006.01); F25B 49/02 (2006.01); F25B 40/00 (2006.01); F25B 41/24 (2021.01)
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)] 17 Claims
OG exemplary drawing
 
1. A refrigerant charging method of recovering a refrigerant from a first heat source unit and charging the recovered refrigerant to a second heat source unit, the refrigerant being included in the 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:
(a) transferring the recovered refrigerant from the first heat source unit to the second heat source unit, the first heat source unit including a first compressor for discharging refrigerant to circulate refrigerant and perform a refrigeration cycle, and a first heat source side heat exchanger, and the second heat source unit including a second compressor for discharging refrigerant to circulate refrigerant and perform a refrigeration cycle, and a second heat source side heat exchanger, and
(b) measuring a weight of the refrigerant that is transferred from the first heat source unit to the second heat source unit,
wherein the refrigerant charging method further comprising:
providing the first heat source unit with a service port of a high-pressure-side shutoff valve, and providing the second heat source unit with a charge port, and wherein
step (b) includes connecting the service port of the high-pressure side shut-off valve of the first heat source unit to a charge port of the second heat source unit with a charge hose.