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Host machine adopts the advanced the new 3rd generation 5:6 asymmetric rotor tooth shaped semi closed screw compressor, motor and compressor integration, no shaft seal leakage concerns two or more compressors there is reincarnation start and stop control program, balancing the head component of load, the extension of long unit life two or more compressor with a plurality of sets of refrigeration loop, which a loop shall repair and maintenance, the rest of the loop is still running, with standby function compressor start to use the unloading buck, to avoid the impact on the power grid