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.

What is Sunoco Refrigeration Oil?

Par Qishanr Lubricants March 31st, 2025 30 vues

Sunoco stands for Sunoco Oil Company. Sunoco has a presence in the oil field, and its Sunoco Refrigeration Oil is an important part of its product line.

Operation Principle of Sunoco Refrigeration Oil:

Lubrication:It reduces the degree of friction and wear in compressor operation, thus prolonging the service life of the compressor.

Sealing:Sealing between the piston and the cylinder surface and between the rotating bearings in the compressor to prevent refrigerant leakage.

Cooling:When lubricated between the moving parts of the compressor, the refrigerant oil carries away the heat generated during the working process and keeps the temperature of the moving parts low, thus improving the efficiency and reliability of the compressor.

Energy regulation:For the refrigeration compressor with energy regulating mechanism, the oil pressure of the refrigeration oil can be used as the power of energy regulating machinery.

Dissolved in refrigerant:Refrigeration oil is completely dissolved in the refrigerant in an air-conditioning refrigeration system and circulates in the refrigeration system together with the refrigerant.

Features of Sunoco Refrigeration Oil include:

1.Low water content and improved solubility for CO₂ refrigeration systems.

2.Excellent film strength.

3.Very high chemical and thermal stability.

4.Excellent carbon and varnish control.

5.Improved resistance against water contamination.

Example1

SUNISO GS/GSD series for HCFC, Natural refrigerants:

Products: 3GS, 4GS, 5GS,3GSD, 4GSD,5GSD

ISO VG: VG32, VG56,VG100

Features: The world's most famous refrigeration oil. For various refrigeration systems using HCFC and natural refrigerants.

Package: 200L DRUM, 20L PAIL, CARTON CASE (4L x6)

Example2

Sunice SL series for HFC, HFO:

Products: SL-10S, 22S, 32S,46S,68S,100S, 120T, 170T, 220T, 320T

ISO VG: VG10-VG320

Features: JSO's finest Polyolester (POE) refrigeration oil. For various refrigeration systems using HFC and HFO refrigerants.

Package: 200L DRUM, 20L PAIL, CARTON CASE (4L x6, 1L x10)

Example3

SUNISO 4SA and 4HT for R717 (NH3)

Products: 4SA,4HT

ISO VG: VG56

Features: 4SA & 4HT are both specifically designed for using with R717. Long time trusted history of 4SA and improved high-temperature durability of 4HT is the reason for the customer's choice.

Package: 200L DRUM, 20L PAIL

To learn more about Sunoco Refrigeration Oil.