| 摘要 |
PROBLEM TO BE SOLVED: To permit the recovery of refrigerant from an indoor machine to the side of an outdoor machine surely without leaking the same to the outside upon pump-down operation in an air conditioner, in which the outdoor machine and the indoor machine are installed separately. SOLUTION: An outdoor machine is provided with a refrigerant pressure detector 21, an outdoor air temperature detector 23, a discharging pipeline opening and closing valve 31 as well as a suction pipeline opening and closing valve 32 while a pump-down operation controller 34 is provided with a pump- down predetermined time setting means 24 and an opening and closing valve control means 33. Accordingly, the pump-down operation is effected by setting a predetermined period of time of pump-down operation in accordance with the condition of refrigerant generated by the outdoor air temperature and a refrigerant pressure while the discharging pipeline opening and closing valve 31 and the suction pipeline opening and closing valve 32 are closed automatically immediately before the starting and finishing of the operation whereby the recovery of refrigerant is ensured and the leakage of refrigerant to the outside can be prevented.
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