To realize the effective removal of moisture in a refrigerating cycle system during trial operation.
When the trial operation of a refrigerating cycle system is performed, a refrigerating cycle is established by connecting a choking means 4, a moisture concentration determination means 6, a dryer 7 positioned on a low-pressure side and a heat exchanger 8, which works as an evaporator, to an outdoor unit 21 of the refrigerating cycle system. By this method, moisture mixed in the refrigerating cycle and most staying in a low-temperature and low-pressure portion is adsorbed and removed by the dryer 7, thereby realizing the prevention of the deterioration of refrigerator oil in the refrigerating cycle system and the improvement in the reliability of the same.
MATSUO MITSUHARU
OZEKI MASATAKA
