06NA2209S7NA-A00 Refrigeration Screw Compressor

The 06NA2209S7NA-A00 is a high-performance 90 HP refrigeration screw compressor built for large-scale air-cooled chillers, process fluid cooling systems, and commercial HVAC central plants. Engineered with an optimized built-in volume ratio (Vi = 3.5) and patented twin-screw rotor geometry, this compressor maintains stable gas compression and low operating vibration. Optimized for eco-friendly R134a refrigerant, it delivers continuous high volumetric yield under demanding operating pressure differentials.

Designed to sustain heavy industrial duty cycles, the 06NA2209S7NA-A00 incorporates high-grade SKF or NSK rolling contact bearings paired with robust axial thrust bearing assemblies. This heavy-duty structure extends routine maintenance intervals and reduces mechanical wear under load. The unit features a full array of internal safeguards, including a quick-closing check valve to prevent rotor reverse rotation during shutdown, an internal pressure safety relief valve, a fine-mesh oil filter to strain circulating contaminants, and an integrated discharge muffler to diminish gas pulsation noise.

To manage varying refrigeration demands efficiently, the compressor utilizes a dual-solenoid 3-stage capacity control system (100% - 66% - 33%), stepping down gas displacement to conserve energy during part-load cycles. Driven by a high-efficiency motor equipped with embedded NTC thermistor winding protection, the compressor supports Star-Delta (Y-Δ) and Direct-On-Line starting profiles across global electrical grids. Housed in a durable 400 kg casting with 2-5/8 in suction and 4-1/8 in discharge connection ports, it provides a long-lasting foundation for high-tonnage refrigeration equipment.