40STD series two stage compressor hvac adopts open-type compressor and is equipped with high-efficiency oil separator independently developed and manufactured. Applicable to R22, R404A and other refrigerants, heat recovery can be configured according to customer's thermal energy requirements. The high temperature, medium temperature and low temperature models are designed for different project requirements. 380V, 3kV, 6kV, 10kV and other voltages can be selected.