Converting a refrigerating system

摘要

A heat source unit (A) in an existing refrigeration system is replaced with a new heat source unit (A) which employs a new refrigerant and is equipped with an oil separator (9) and extraneous-matter trap (13). An indoor unit (B) of the existing refrigeration system may be used, in its existing form, or replaced with a new indoor unit (B). Further, existing connecting pipes (C,D) are reused. After replacement of refrigerant, the refrigeration system performs ordinary operation after having performed a cleaning operation. The trap (13) is provided in a refrigerant pipe close to the heat source unit or in a bypass channel (9a) connected to the refrigerant pipe close to the heat source unit. Alternatively, only the heat source unit of the existing refrigeration system is replaced with a new one, and there is employed refrigeration oil which has no mutual solubility with respect to HFC or has very low mutual solubility.