Daikin Industries, Ltd.

Shin Furuta

Ikuji Ishii

Toshio Ashida

Shinichi Nakaishi

Nobutaka Sasaki

In a main circuit (,) of refrigerant circuitry (,), a liquid-side shutoff valve (,) is provided between a liquid receiver (,) and an indoor heat exchanger (,). Downstream of the liquid-side shutoff valve (,), a refrigerant charging section (,A) including a refrigerant charge valve (,) connectable with a refrigerant cylinder (,) is provided. The refrigerant circuitry (,) includes a pressure relieving circuit (SVP) for conducting refrigerant in a high-pressure-side line of the refrigerant circuitry (,) to a low-pressure-side line thereof in additional refrigerant charging operation executed by operating compressors (,) with the liquid-side shutoff valve (,) closed. The refrigerant circuitry (,) further includes an injection circuit (SVT) for lowering the temperature of refrigerant discharged from the compressors (,) by supplying low-temperature refrigerant flowing downstream of an outdoor electronic expansion valve (,) to the compressors (,) when the superheating degree of the discharged refrigerant is larger than a first predetermined temperature.

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Osaka, Japan

Shin Furuta