| 摘要 |
PROBLEM TO BE SOLVED: To reduce the damage of a compressor by a method wherein an opening and closing valve, a refrigerant regulating tank and a control valve are arranged while the valves are controlled by an opening and closing controller so that an excessive load is not applied on the compressor upon starting the same and the amount of refrigerant, coping with the load, is supplied as the load becomes that of stationary operation. SOLUTION: When the operation of a refrigerating and air-conditioning cycle 2 is started, an opening and closing valve 11 is opened by a valve opening degree controller 15 and the valve is closed after the number of rotation of a compressor or the supply of oil to respective sliding parts is stabilized. Then, the circulation of carbon dioxide gas refrigerant is started and, after a substantially stationary operating condition is achieved and temperature regulation by a utilizing side heat exchanger 7 is started, the opening degree of opening and closing valves 13, 14 before and after a refrigerant regulating tank 12 are regulated so that the amount of refrigerant in the refrigerating and air-conditioning cycle 2 becomes an amount coping with a load. On the other hand, when the operation of the refrigerating and air- conditioning cycle 2 is to be stopped, the opening degree of the opening and closing valves 13, 14 is regulated prior to the stopping of the compressor 1 to recover the refrigerant into the regulating tank 12 and, thereafter, the opening and closing valve 11 is closed to stop the compressor 1.
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