... with oil separator, high &lower pressure controller Usability: The compressor unit can for use in many kinds of refrigerants such as ... R22,R134a,R404,R407c.The same serial compressor unit,is suitable for different applications. Excellent functions: Equipped with ... and add transfer-heating result.BFBV20 over 56H(Y)compressor unit adopted split wire motor,it can use small current ...