| 摘要 |
PROBLEM TO BE SOLVED: To reduce labor hours while effectively recovering a refrigerating machine oil, in a method for recovering the refrigerating machine oil from connecting pipes (23, 24) of a refrigerating device (10) equipped with a refrigerant circuit (20) composed of a heat source unit (11) and a utilization unit (13) connected by the connecting pipes (23, 24). SOLUTION: A first process and a second process are performed in order. In the first process, the refrigerating machine oil is recovered along with a part of a refrigerant communicated with a gas side port (28) of the refrigerant circuit (20), from the gas side port (28) opening to the gas side connecting pipe (24) at a closed position of a gas side closing valve (26) provided at one end of a heat source side circuit (21). In the second process, in the state of the gas side closing valve (26) closed, the refrigerating machine oil is removed along with a part or the entire refrigerant of a part of the refrigerant circuit (20) communicating with a liquid side port (27), from the liquid side port (27) opening to the liquid side connecting pipe (23) at a closed position of a liquid side closing valve (25) provided at the other end of the heat source side circuit (21). COPYRIGHT: (C)2007,JPO&INPIT
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