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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Ejemplo

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Qishanr Refrigeration Oil

The Qishanr QSL range are synthetic polyolesters (POE) lubricants formulated specifically for use in refrigeration and air-conditioning compressors using HFC refrigerants. These products have characteristics of low temperature and unparalleled chemical and thermal stability, provide effective wear protection for bearing surfaces, increased system life and improved efficiency, and are suitable for both initial fill and service fill.

Detalles del caso

Advantages of Qishanr QSL
Qishanr refrigeration oils have the following characteristics which assure maximum trouble-free service life:

Chemical Stability
To resist interaction with the refrigerant or metal parts in the system.

Thermal Stability
To eliminate excessive carbon deposits at compressor hotspots such as valves or discharge ports.

Low Wax Content
To prevent separation of flocculent wax from the oil-refrigeration mixture at the low temperature points in the system.

Low Pour Point
To prevent separated oil from congealing in refrigerant lines.

High Dielectric Strength
To ensure good insulating properties. In hermetic units, the oil-refrigerant mixture serves as an insulator between the motor and the compressor body.

Proper Viscosity
To ensure high film strength at elevated operating temperatures and good fluidity under the coldest operating temperatures even when diluted with refrigerant.

No Contamination
To prevent scarring of bearing surfaces, plugging of lines or oil ports and general deterioration.

Some concrete examples introduction of Qishanr refrigeration oils is as follows:

Example1
Refrigerator Refrigeration Lubricant
Model: QSL-811
Net:400ml
Applicable Refrigerants: R600A,R290
Application: Refrigerator/fridge/freezer compressors

Example2
POE Refrigeration Lubricant
Model: QSL-813
Net:400ml
Applicable Refrigerants: R410A,R134A,R404A,R407C,R507 Application: Air conditioning and refrigeration compressors

Example3
Multiple Refrigeration Lubricant
Model: QSL-818
Net:400ml
Applicable Refrigerants: R22,R152,R406
Application: Air conditioning and refrigerator compressors

Example4
Vacuum Pump Lubricant
Model: QSL-612
Net:400ml
Application: Vacuum pumps

Example5
Qishanr GS
3GS, 4GS, 5GS
Recommended by most major equipment manufacturers and refined from specially selected naphthenic base crude oils. Highly stable,essentially wax free, thus providing excellent low temperature properties and assuring long trouble-free life. Qishanr GS oils can be used in virtually any installation,regardless of compressor or evaporation temperature and are miscible with (H)CFC refrigerants and natural refrigerants. Therefor Qishanr GS oils can be applied in commercial as well as in residential refrigeration and air conditioning systems.

Example6
QSL-68H,QSL-46H,QSL-22H
Excellent Thermal Stability.
Outstanding Miscibilit.
Great Chemical Stability.
Low Pouring Point.

Trane Refrigeration Oil

Sunoco Refrigeration Oil

DIVERSITY OF EXPLORATION

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.