What type of refrigeration oil should I use for my screw compressor?

Screw compressors typically require POE (Polyol Ester) oils for HFC refrigerants like R134a and R407C, or mineral oils for HCFC systems like R22. The viscosity grade (usually ISO VG 32-68) depends on the compressor manufacturer's specifications. Brands like Bitzer recommend BSE series POE oils, while FUSHENG systems often use mineral oil formulations.

What is the difference between POE and mineral refrigeration oil?

POE (Polyol Ester) oils are synthetic lubricants designed for HFC refrigerants (R134a, R404A, R407C, R410A) and are hygroscopic, requiring careful moisture control. Mineral oils (MO) are petroleum-based, used with CFC and HCFC refrigerants (R22, R502), and are less expensive but incompatible with modern HFC systems. POE oils offer better thermal stability and miscibility with newer refrigerants.

How do I select the right refrigeration oil for a centrifugal chiller?

For centrifugal chillers, select oil based on the OEM specification (e.g., Trane OIL00037, York PureOil S), the refrigerant type (R123 low-pressure or R134a medium-pressure), and the required viscosity grade. Most modern centrifugal chillers use POE oils with ISO VG 32-68. Always verify compatibility with the chiller manufacturer's technical bulletin and ensure the oil meets the required pour point for your operating conditions.

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Qishanr Lubricants

Directory of Refrigeration Oils Designed for Use in BITZER Semi-Hermetic Compressors

Advantages of Using Refrigeration Oil Designed Specifically for BITZER Semi-Hermetic Compressors

Selecting Synthetic Refrigeration Oil for Longevity in BITZER Compressors

Optimizing Performance with Refrigeration Compressor Oil for BITZER Screw Models

QSL-68H vs Emkarate RL68H vs CPI Solest 68: POE Oil Cross-Reference Guide

How to Select the Right Compressor Oil: A Complete Guide for Screw, Scroll & Reciprocating Compressors