| 摘要 |
Provided is an air conditioner which is installed by using existing connection pipes and in which a cleaning operation time for the connection pipes can be reduced as much as possible. An air conditioner (1) includes an outdoor unit (2) and at least one indoor unit (3) connected to the outdoor unit (2) through a liquid refrigerant pipe (5) and a gas refrigerant pipe (4), the existing connection pipes being available for the liquid refrigerant pipe (5) and the gas refrigerant pipe (4). The air conditioner (1) includes a pipe cleaning control portion (25) that cleans the existing connection pipes by allowing an aperture of an electronic expansion valve for cooling (11) to be periodically opened and closed for a plurality of times between an aperture A during a superheat degree control and an aperture B in a fully-opened state or in a substantially fully-opened state, in a cooling cycle, to thereby intermittently cause liquid flowing back, during a pipe cleaning operation after connection of the outdoor unit (2) and the indoor unit (3). |
