... 70HSN7471-75HSN8571-125HSK8571-140HSN8591-160Multiple screw compressor condensing unit1.bitzer series screw compressor from 150HP to 540HP , 2 ... R134a,R507A,R407CAdvantages:1) save cost, reduce first time equipment investment2) safe power,supply cooling capacity according to need, ... , food, restaurant , chemical industry, working shop etc. bitzer semi-hermetic water cooled refrigeration equipment