| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that there are generated an excess and a shortage of an output when excessively restraining the start/stop of a constant speed compressor, though the start/stop of the constant speed compressor is restrained for preventing consumption when the constant speed compressor repeats the start/stop, in a refrigerating unit having a variable speed compressor and the constant speed compressor. SOLUTION: Low pressure is measured by a pressure detector, and reference low pressure is calculated from the present low pressure and the past low pressure, and when the reference low pressure reaches a low limit value or lower of a predetermined range and a signal is outputted from a control device for reducing the operation number of the constant speed compressor by two units, the reducing operation number of the constant speed compressor is set to one unit, and an operation frequency of the variable speed compressor is set to a minimum frequency. COPYRIGHT: (C)2009,JPO&INPIT
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