| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of noise by suppressing the frequency switching according to the state. SOLUTION: The control device of this refrigeration unit changes the frequency every preset time. It also changes the frequency when the intake pressure exceeds a prescribed value even within the lapse of the preset time. Further, it controls the frequency so as not to reach the maximum frequency for a prescribed time after the starting of a compressor. COPYRIGHT: (C)2004,JPO
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