| 摘要 |
PROBLEM TO BE SOLVED: To shorten defrosting time and hence prevent room temperature from being lowered in defrosting for an air conditioner. SOLUTION: In heating operation, an outdoor machine control section 11 detects outdoor heat exchange temperature with a detection signal obtained by an outdoor heat exchange temperature detection section 7 while determining looking at a table 11a an opening of an electronic expansion valve 5 constituting a freezing cycle in response to a difference between a set temperature of a remote controller 12 and a room temperature detected by a room temperature detection section 13 and in response to a change in outdoor heat exchange temperature when the outdoor heat exchange temperature becomes a defrosting operation value or less. As the change in the outdoor heat exchange temperature is negative and larger, and the difference between the room temperature and the set temperature is negative and larger, the opening of the electronic expansion valve 5 is correspondingly reduced to start hot gas bypass defrosting and hence increase the amount of a gas refrigerant flowing through the outdoor heat exchanger via a bypass pipe. |
