06NA2174S7NA-A00 85HP Industrial Semi-Hermetic HVAC Screw Compressor

Engineered specifically for central air-cooled chillers and industrial HVAC process cooling, the 06NA2174S7NA-A00 semi-hermetic screw compressor HVAC unit utilizes Carlyle's patented twin-rotor geometry driven by an integrated speed-multiplying gear drive. Tailored for environmentally friendly R134a refrigerant, its air-cooled volume ratio (Vi) delivers high volumetric efficiency, steady mass flow, and lower discharge temperatures across variable commercial cooling envelopes.

To align power consumption directly with fluctuating building thermal loads, the compressor features a 3-step capacity modulation mechanism operated via simple dual solenoid valve controls. Operating reliability is further enhanced by an internal anti-reverse rotation check valve that prevents rotor backspin during shutdowns, an integrated oil filter, and a built-in discharge muffler that significantly dampens gas pulsation noise.

Constructed with a heavy-duty cast casing, the 06NA2174S7NA-A00 is fitted with premium SKF/NSK rolling thrust bearings designed for long service life under continuous high pressure differentials. The high-efficiency motor supports Star-Delta (Y-Δ) starting to minimize electrical grid voltage drops upon activation, while embedded thermal winding sensors provide continuous over-temperature protection during peak cooling operations.

Ruifujie is an engineering-driven B2B manufacturer and global exporter specializing in commercial and industrial refrigeration technology. With over two decades of industry experience, our product portfolio encompasses semi-hermetic screw, reciprocating, scroll, and rotary compressors, alongside custom-engineered cold room condensing units and chilling systems. Serving mechanical contractors, HVAC system integrators, and equipment distributors across Europe, the Americas, and the Middle East, Ruifujie delivers factory-direct pricing, rigorous quality assurance, and end-to-end OEM/ODM technical support.

By modulating compressor output between 100%, 66%, and 33%, the compressor matches real-time cooling loads without frequent motor cycling, reducing energy costs during partial-load conditions.

The integrated check valve prevents high-pressure discharge gas from flowing back into the suction chamber, protecting the twin rotors and internal gears from reverse rotation wear.

Star-Delta (Y-Δ) starting is recommended, as it lowers locked rotor current significantly compared to direct across-the-line starting.

Units are mounted on heavy wooden skids, wrapped in moisture-barrier film, and fully enclosed in export-grade plywood crates designed for ocean and air transport.