| 摘要 |
PROBLEM TO BE SOLVED: To provide an air conditioner for keeping the temperature of engine water within a proper range and for inhibiting the decrease in capacity in heating operation in a defrosting mode. SOLUTION: In this air conditioner, a compressor 120 that is driven by an engine 110 is connected to the refrigerant pipeline of an indoor side heat exchanger 122 and an outdoor side heat exchanger 124 via a four-way valve 121, a refrigerant pipe 132, a bypass switching valve 137, a water heat exchanger 133 are provided at a bypass pipeline where one end side is connected to the high-pressure liquid pipe of the refrigerant pipeline and the other side is connected to a pipeline reaching the indoor side heat exchanger 122 from the four- way valve 121, and the water heat exchanger 133 and a radiator 111 are connected in parallel with the cooling water pipeline of the engine 110. In the air conditioner, the cooling water pipeline in the engine 110 is provided with an engine water temperature sensor 30 for detecting the temperature of the cooling water of the engine 110, and the cooling water pipeline at the output side of the engine 110 is provided with a first amount-of-water control valve 10 that is connected to the input side of the cooling water of the water heat exchanger 133.
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