| 摘要 |
<p>An air conditioner (1) uses carbon dioxide as the refrigerant and has a two-stage compression type compression mechanism (2), a heat source-side heat exchanger (4), an expansion mechanism (5), a utilization-side heat exchanger (6), a switching mechanism (3), an intermediate cooler (7) functioning as a cooler for the refrigerant discharged from a front stage-side compression element and sucked into a rear stage-side compression element, and an intermediate cooler bypassing tube (9). In defrosting operation for defrosting the heat source-side heat exchanger (4), the air conditioner (1) causes the refrigerant to flow to the heat source-side heat exchanger (4) and the intermediate cooler (7), and after detecting the completion of the defrosting of the intermediate cooler (7), the air conditioner (1) uses the intermediate cooler bypassing tube (9), causing the refrigerant not to flow to the intermediate cooler (7).</p> |
