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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Trane Refrigeration Oil

Trane refrigeration oils are a line of specialised lubricants designed by Trane for its heating, ventilation and air conditioning (HVAC) and refrigeration equipment. Trane refrigeration oils are designed to ensure the reliability and efficiency of compressors and other critical components over extended periods of operation and are typically compatible with the refrigerants R-134a, R-404A, and R-410A.

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The characteristics of Trane Refrigeration Oil include the following：
1.High miscibility: Good miscibility with the refrigerant R514A used in Trane centrifugal compressors, ensuring stable system operation.

2.Excellent lubricity: It can reduce the friction and wear inside the compressor, and prolong the service life of the compressor.

3.Good chemical stability: It is not easy to have chemical reaction with the refrigerant, keeping the oil stable.

4.Good thermal stability: it is not easy to oxidise and decompose under high temperature environment to maintain lubrication performance.

The usage scenarios of Trane refrigeration oil mainly include the following:
1.RTHC, RTHD and other screw machines: Trane Refrigeration Oil No. 48 (OIL00048) belongs to POE synthetic refrigeration oils, which is suitable for use on RTHC, RTHD, RTHG, RTWD, RTWS, RTWH, RTHE, RTAC, and RTXC screw units with refrigerants of R134a, R407C, R410A, and other refrigerants.

2.Water-cooled screw chiller units: For example, RTHD/C water-cooled screw chiller units with R134A refrigerant and cooling capacity ranging from 156-421 cooling tonnes, and RTHE/G water-cooled screw chiller units, also with R134A refrigerant and cooling capacity ranging from 64-393 cooling tonnes. These units are not only suitable for small and medium-sized factories, hotels and transport stations, but also meet the needs of large shopping centres and public buildings.

Description of different models of Trane Refrigeration Oil and their characteristics：
Example1
Trane OIL00048:
1.Excellent chemical stability coexisting with refrigerant gas.
2.Excellent lubricity.
3.Wonderful intermiscibility with refrigerant.
4.Excellent adaptability to insulator and sealing material.
5. Excellent antifoam property.
6.No wax separation.
7. No water content.
8.Excellent mobility in low temperature.

Example2
Trane OIL00037:
1.Trane OIL00037 Refrigeration Oil is suitable for use with a wide range of refrigerants such as R-410A, R-134A, etc.
2.It also helps to maintain system efficiency and extend equipment life.
3.Trane OIL00037 is primarily used in chillers, air conditioners, heat pumps and other refrigeration equipment.
4.The benefits include higher energy efficiency, lower maintenance costs, better system performance and longer equipment life.

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York Refrigeration Oil

Qishanr Refrigeration Oil

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OUTDOOR SCENE

However, those with sealed components, including motors, controllers, and connectors, can also be operated outdoors. Performance IC forklifts tend to be utilized in heavy-duty applications, such as brick and lumber yards, where larger capacity and performance is required to move the heavy loads.