| 摘要 |
To expand, in an air conditioner (1) disposed with a refrigerant circuit (12) that includes a heat source heat exchanger (23) configured such that refrigerant flows in from below and flows out from above when the heat source heat exchanger functions as an evaporator of the refrigerant and with the refrigerant circuit being capable of switching that causes the heat source heat exchanger (23) and utilization heat exchangers (32, 42, 52) to function separately as evaporators or condensers of the refrigerant, the control width when the evaporating ability of the heat source heat exchanger (23) is controlled by a heat source expansion valve (24). In the air conditioner (1), when the heat source heat exchanger (23) is caused to function and operates as an evaporator, the refrigerant discharged from a compression mechanism (21) is bypassed to an intake side of the compression mechanism (21) via a first bypass circuit (102), operation is switched to an operation causing the heat source heat exchanger (23) to function as a condenser, and an expansion valve (24) is closed, whereby refrigerating machine oil accumulating inside the heat source heat exchanger (23) is returned to the intake side of the compression mechanism (21) from a lower portion of the heat source heat exchanger (23) via an oil returning circuit (101). |
