| 摘要 |
PROBLEM TO BE SOLVED: To change an operation mode so that a plurality of heat source-side heat exchangers are functioned as an evaporator of a refrigerant at proper timing, in a first operation mode in which any one of the plurality of heat source-side heat exchangers is functioned as a radiator of the refrigerant, and the other is functioned as the evaporator of the refrigerant.SOLUTION: In a first operation mode, a first liquid tube temperature as a temperature of a refrigerant at utilization-side heat exchangers (52a, 52b, 52c, 52d) of a liquid tube heat exchanger (45) exchanging heat with a refrigerant flowing on a liquid side of a plurality of heat source-side heat exchangers (24, 25), is compared with a second liquid tube temperature as a temperature of a refrigerant at the heat source-side heat exchangers (24, 25) of the liquid tube heat exchanger (45), and when a liquid tube temperature condition to switch to evaporation, is satisfied, the operation mode is switched to a second operation mode to make the plurality of heat source-side heat exchangers (24, 25) be functioned as the evaporator of the refrigerant by switching the heat source-side heat exchanger (24) functioned as the radiator of the refrigerant, to the evaporator of the refrigerant. |
