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 Qishanr Refrigeration Oil?

Oleh Wendy Li March 22nd, 2025 pandangan 36

Qishanr and Qishanr QSL
Qishanr is the world's leading supplier of synthetic lubricants to the refrigeration and air conditioning industry. The Qishanr QSL polyol ester (POE) lubricants are designed to meet all your needs.Qishanr QSL is the only name you need to know when you require an OEM approved synthetic refrigeration lubricant for appliance, large industrial systems, air conditioning (residential, commercial, or transport) and automotive or aftermarket applications.

Application of Qishanr QSL

More than 1 billion compressors filled with Qishanr QSL. The Qishanr QSL brand provides a complete range of viscosities coupled with quality, reliability and performance for original fill oils and retrofit aftermarket service oils. Today more compressor manufacturers have given their' stamp of approval' by using Qishanr compressor lubricants compared to any other manufacturer.

Qishanr QSL lubricants are designed for standard factory fill of air conditioning and industrial refrigeration equipment, as well as for OEM retrofitting operations. They provide improved properties over conventional mineral oils in all aspects, including flash and fire points and pour point.

Advantages of Qishanr QSL
Qishanr refrigeration oils have the following characteristics which assure maximum trouble-free service life:
1.Chemical stability: To resist interaction with the refrigerant or metal parts in the system.

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

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

4.Low pour point: To prevent separated oil from congealing in refrigerant lines.

5.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.

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

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

Example1
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 providingw 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)CFCrefrigerants and natural refrigerants. Therefor Qishanr GS oils can be applied in commercial as well as in residential refrigeration and air conditioning systems.

Example2
Refrigerator Refrigeration Lubricant:
Model: QSL-811
Net:400ml
Applicable Refrigerants: R600A,R290
Application: Refrigerator/fridge/freezer compressors

Example3
POE Refrigeration Lubricant:
Model: QSL-813
Net:400ml
Applicable Refrigerants: R410A,R134A,R404A,R407C,R507
Application: Air conditioning and refrigeration compressors