Importance

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Abstract

There is provided a refrigeration apparatus in which a refrigerant accumulating in non-operating outdoor units is supplied to an outdoor unit being operated in which a shortage of refrigerant occurs without starting the compressors of the non-operating outdoor units. In the control method for the refrigeration apparatus in which to refrigerant piping 10 installed between the indoor side and the outdoor side, a plurality of outdoor units 30A, 30B each including a compressor 31, a directional control valve 34, an outdoor heat exchanger 35, an outdoor expansion valve 36, and an accumulator 37 are connected in parallel on the outdoor side, and each of the outdoor units is provided with a hot gas bypass circuit 38 that includes a solenoid valve 38a and an expansion mechanism 38b arranged in series, and is connected between high-pressure side piping 33a on the discharge side of the compressor and low-pressure side piping 33b on the accumulator side, if a shortage of refrigerant occurs when air cooling operation is performed in a state in which only the outdoor unit 30A is operated and other outdoor units 30B are not operated, the solenoid valves 38a of the non-operating outdoor units 30B are opened so that the refrigerant accumulating in the non-operating outdoor units 30B is supplied to the outdoor unit 30A via the hot gas bypass circuit 38 and the low-pressure piping 33b.

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First Claim