| 摘要 |
It is an object of the present invention to provide an air conditioner for inhibiting noise increase and heating performance degradation due to frost attachment onto an outdoor heat exchanger. In an air conditioner (1), a determining part (43) of a control unit (4) determines that the amount of frost attaching onto an outdoor heat exchanger (13) is increased when a difference between an outdoor temperature To and an outdoor heat exchanger temperature Te is increased, and executes a frost attaching condition operation control for reducing the rotation speed of an outdoor fan (23). The operating frequency of the compressor (11) is herein increased in accordance with the reduction amount of the temperature of an indoor heat exchanger (15). The control unit (4) includes change amounts preliminarily set for changing the operating frequency of the compressor (11) in stages. The change amounts correspond to the stages on a one-to-one basis. The control unit (4) increases the operating frequency of the compressor (11) by corresponding one of the change amounts required for upgrading a present stage of the operating frequency of the compressor (11) to a stage immediately higher than the present stage every time the temperature of the outdoor heat exchanger (15) is reduced by a predetermined amount, and reduces the rotation speed of the outdoor fan (23) in accordance with the change amount. |
