| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an oil recovery method of a multi-type air conditioning system capable of efficiently and surely recovering a refrigerating machine oil during system renewal. <P>SOLUTION: A liquid refrigerant previously encapsulated in an outdoor unit 1 is sent from a liquid conduit 9 to an indoor unit 3 and the liquid refrigerant and a gas refrigerant from a high-pressure gas pipe 5 are mixed into a gas liquid double phase state. The refrigeration oil is surely recovered from a low-pressure gas pipe 7 by sending the refrigerant in the gas-liquid double phase state to a low-pressure gas pipe 7. <P>COPYRIGHT: (C)2013,JPO&INPIT |
