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It can control the capacity effectively according to turn on/off the compressor.
It can increase the reliability for a less time of turning on/off than a single compressor system
It can decrease the starting load by means of differenting the time of starting of each compressor
It can provide the spare energy if one compressor of them is damaged
It can reduce the cost of replacement for the compressor price is lower than a large one
Air Conditioner - Air Cooled Water Chiller and Heat Pump