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High energy efficiency: The whole range achieves Class 1 energy efficiency. Magnetic levitation bearings enable oil-free operation. It adopts high-efficiency rare-earth permanent magnet synchronous motors, two-stage compression with intelligent vapour injection and secondary subcooling, together with highly reliable throttling devices.

During low-temperature cooling in winter, the opening of the stabilising valve at the compressor discharge port is adjusted automatically to keep the discharge pressure within the required range. This improves operating efficiency and maintains the necessary oil supply differential pressure.

Comprehensive protection functions fitted as standard, including phase reversal and phase loss protection, high/low pressure protection, thermal overload protection and freeze protection.

Throttling assembly combining composite orifice plates and oil-free-system-specific electronic expansion valves. It adjusts refrigerant flow promptly under variable loads and working conditions to guarantee stable unit operation.

High energy efficiency, fitted with semi-hermetic screw compressors.Independent oil return system to ensure timely oil return.Intelligent control with a dedicated microprocessor controller for flexible regulation of unit operating status; equipped with self-locking and self-diagnosis functions.

Cooling capacity of a single unit: 2,110 kW – 4,220 kW，Fitted with Hanzhong two-stage centrifugal compressor.