| 摘要 |
PROBLEM TO BE SOLVED: To provide an air conditioner capable of collecting a refrigerating machine oil accumulating in a gas piping by a simple operation in heating, and a method of collection of the oil. SOLUTION: This air conditioner 50 is constituted such that outdoor units 1A and 1B having compressors 11A and 11B, four-way valves 13A and 13B, and outdoor heat exchangers 14A and 14B and indoor units 3A and 3B having indoor heat exchangers 34A and 34B and indoor expansion valves 38A and 38B are connected to each other through unit-to-unit tubes 9 formed of gas tubes 5 and liquid tubes 7. The air conditioner is provided with a means for collecting the refrigerating machine oil accumulating in the gas tubes 5 to the compressors 11A and 11B by stopping the operations of the outdoor units 1A and 1B and indoor units 3A and 3B in heating operation, switching the four-way valves 13A and 13B of the outdoor units 1A and 1B to positions in cooling operation, and flowing a liquid refrigerant in the gas tubes 5 by using a pressure difference across the four-way valves 13A and 13B switched to the positions in the cooling operation. COPYRIGHT: (C)2005,JPO&NCIPI
|
