| 摘要 |
Prediction error in quantity of refrigerant due to difference in solubility of refrigerant into oil is minimized by eliminating refrigerant liquefied into refrigerating machine oil in a compression machine mechanism. The air conditioner (1) comprises a refrigerant circuit (7), means (8a-8c) for judging refrigerant, and operation controllers (6a-6c). The refrigerant circuit includes heat source units (2a-2c), refrigerant communication pipings (4, 5), expansion mechanisms (31a, 31b,...), and utilization units (29a-29c, 3a, 3b,...). The refrigerant communication piping is connected with the heat source units and the utilization units. The heat source unit has compression mechanisms (21a-21c) and heat source side heat exchangers (24a-24c). The means for judging liquefied refrigerant can judge the situation of liquefied refrigerant in the compression mechanism. When liquefied refrigerant is detected in the compression mechanism before operation for judging the quantity of refrigerant in the circuit is performed, the operation controller performs an operation for eliminating the liquefied refrigerant.
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