XHS-xxS series screw style chillers host used German BITZER semi-hermetic screw compressors have outstanding technical characteristics into single compressor and two-compressor models. Is applicable to R22, R407, R134a and other refrigerant. High efficiency horizontal shell and tube condenser and evaporator have "BR1" state permission to create pressure vessel, heat stability and maintenance convenience. Advanced micro-computer controller, a powerful, high-speed embedded microprocessor performance is much higher than similar products used in the single-chip machine