619 The single-screw stepless compressor for high capacity Screw compressor with integrated inverter Characteristics: J Optimal performance through stepless capacity control chilled water temperatures. The unit capacity is infinitely variable from 30 - 100% on single circuit units and 15 -100 % on dual circuit units. J Compact, simple yet robust construction. J Using a main single screw and two gate rotors, axial and radial forces are balanced, thanks to the symmetrical compression guaranteeing low bearing loads. J Gate rotors made of polymer material result in closer tolerances with the main screw and reduced friction greatly improves compressor efficiency and lifetime. J No oil pump necessary - lubrication based on the differential pressure principle. J Easy access to both compressor and safety devices. J Star-Delta starter with low starting current as standard. Characteristics: J Compressor and inverter fully designed by Daikin J Inverter integral to the compressor body J Inverter refrigerant cooled J VVR = Variable Volume Ration for optimized efficiency J Enlarged discharge port and suction side for reduced refrigerant pressure drop J New optimized compressor motors Main benefits: J Better ESEER & EER values J 30% more compact than single-screw compressor J Rapid payback time J Silent operations J Optimal comfort levels At the heart of the larger Daikin chillers is a semi hermetic single screw compressor, designed, tested and manufactured in Daikin’s own factories, in order to meet the highest capacity, performance and maintenance specifications. This compressor has been especially developed for operation with R-410A or R-134a refrigerants, guaranteeing unequalled reliability and many years of efficient operation. The bearing life is 100,000hrs with inspection and maintenance intervals every 40,000hrs. Refrigerant discharge Compressor terminal + CTP 2nd-stage oil separator Stepper Motor Demister (oil separator) Screw rotor Bearing Slide valve Refrigerant suction Motor Casing Gate rotor VVR control Discharge port Econ. & Liquid injection ports Capacitors Aluminium cooling plate Inverter Liquid inlet (VFD cooling) Suction port Whatever the requirements of the customer - large systems requiring constant capacity or small systems for flexibility - Daikin always provides a reliable and efficient solution.
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