REFRIGERATION AIR-CONDITIONING APPARATUS AND REFRIGERANT CHARGING METHOD THEREFOR

摘要

A refrigerant charging method for a refrigeration air-conditioner provided with a compressor (1) for sucking a refrigerant and discharging the refrigerant after compressing the refrigerant. The refrigerant discharged from the compressor (1) is returned to the suction side of the compressor (1) via an on-off valve (5), and a refrigerant is charged between the on-off valve (5) and the suction side of the compressor (1) from a refrigerant charging port (7) via a refrigerant charging on-off device (6).