| 摘要 |
The air-conditioning apparatus (1) uses carbon dioxide as a refrigerant and has a two-stage-compression-type compression mechanism (2), a heat source-side heat exchanger (4), an expansion mechanism (5), a usage-side heat exchanger (6), a switching mechanism (3), an intercooler (7), a bypass tube (9), and an injection tube (19). The air-conditioning apparatus (1) is configured so that when the switching mechanism (3) is switched to the cooling operation state to allow refrigerant to flow to the heat source-side heat exchanger (4) whereby a reverse cycle defrosting operation for defrosting the heat source-side heat exchanger (4) is performed, the refrigerant is caused to flow to the heat source-side heat exchanger (4), the intercooler (7) and the injection tube (19), and after the defrosting of the intercooler (7) is detected as being complete, the bypass tube (9) is used so as to ensure that the refrigerant does not flow to the intercooler (7) and so as to control that the opening degree of an injection valve (19a) of the injection valve (19) is increased. |
