... 70HSK7471-90HSK7471-70HSN7471-75HSN8571-125HSK8571-140HSN8591-160Multiple screw compressor condensing unit1.bitzer series screw compressor from 150HP to 540HP , 2 TO 6 ... numbers of compressor to be parallel unit2. Refrigerant : R404A, R22, R134a,R507A,R407CAdvantages:1) save cost, reduce ... , chemical industry, working shop etc. bitzer semi-hermetic water cooled refrigeration equipment