Danfoss SZ185-4RI Compressor

The Danfoss SZ185-4RI is a high-performance 14-ton scroll compressor engineered specifically for technical applications utilizing R407C refrigerant and POE oil. Operating on a 460V 3-phase power supply at 60Hz, this unit delivers a nominal cooling capacity of approximately 186,100 BTU/h. Designed for commercial air conditioning and heat pump systems, it features rotolock connections (1-3/4" suction, 1-1/4" discharge) for secure, leak-resistant piping integration. The large commercial scroll design incorporates a lead-wire motor connection and internal motor protection to ensure reliable duty cycles under high-load conditions. As a Danfoss Blue Gold series component, the SZ185-4RI maintains high energy efficiency ratios (EER) by optimizing scroll wrap geometry. This industrial HVAC compressor is built with a 381mm diameter shell, making it a drop-in replacement for standard 14-ton circuits in rooftops and chillers where high-efficiency R407C compression is required for system maintenance or upgrades.

• Optimized for R407C: Specifically valved and lubricated with POE oil for reliable expansion valve operation and oil return in medium to high-evaporating temperature applications.
• Rotolock Connectivity: Simplifies field installation and brazing procedures, reducing downtime during compressor swap-outs.
• Robust Motor Protection: Features internal line break protection to prevent motor burnout during phase loss or thermal overload events.
• High Volumetric Efficiency: Advanced scroll compliance technology handles liquid slugging better than reciprocating units while maintaining consistent discharge pressures.

Common Questions

What are the specific electrical requirements for the SZ185-4RI?
This unit requires a 460V (+/- 10%) 3-phase supply. It is critical to verify phase sequencing to ensure the scroll rotates in the correct direction, as reverse rotation can damage the internal components.

Can this compressor be used with R22 systems?
While the mechanical footprint is similar to some R22 models, the SZ185-AR4 is optimized for R407C. Using it with R22 requires a thorough assessment of system pressures and oil compatibility, though it is primarily intended as an R407C or R134a solution.

What is the proper oil charge for this unit?
The SZ185-4RI comes factory-charged with 132 oz of Polyolester (POE) oil. Always check the sight glass after the initial break-in period to ensure proper levels are maintained throughout the circuit.

This item must ship via truck. Please contact us for freight quote.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.