| 摘要 |
<p>The present invention aims to prevent a refrigerant at a low temperature from being sent to a load-side heat exchanger during a defrost operation. At a time of a heat radiating operation, a switching mechanism 2 is controlled such that the refrigerant from a compressor 1 flows to a load-side heat exchanger 3, thereby causing the heat exchanger 3 to operate as a heat radiator and causing at least one of heat-source-side heat exchangers 5a and 5b to operate as an evaporator. At a time of the defrost operation of removing frost at the heat exchanger 5a, the switching mechanism 2 is controlled such that the refrigerant from the compressor 1 flows to the heat exchangers 3 and 5a, thereby causing the heat exchangers 3 and 5a to operate as heat radiators and causing the heat exchanger 5b to operate as an evaporator.</p> |
