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.

Daphne Refrigeration Oil

Daphne Refrigeration Oil is a series of synthetic refrigeration oils developed by IDEMITSU, designed for air-conditioning and low-temperature compressors using HFC (hydrofluorocarbon) refrigerants. The core components are highly refined polyvinyl ether (PVE) synthetic base oils, with the addition of antioxidants and wear-resistant agents, etc. The oils have excellent refrigerant compatibility, lubricity and electrical insulation, and are widely used in hermetic compressor systems.

Case Details

Characteristics
1. Good refrigerant compatibility: Excellent compatibility with R407C, R410A, R404A and other HFC refrigerants, can ensure that in the refrigeration system and the refrigerant is fully mixed, there will be no stratification or precipitation phenomenon, to effectively avoid the problem of oil return, to ensure that the compressor is well lubricated and cooled.

2. Environmental protection and safety: Free of heavy metals and aromatic hydrocarbons, in line with environmental requirements.

3. Good material adaptability: It has good compatibility with various parts materials in the refrigeration system, such as metal, rubber, plastic, etc., and will not have adverse effects such as corrosion, dissolution or embrittlement of these materials to ensure the sealing and reliability of the system.

Application Scenarios of Daphne Refrigeration Oil
- Air-conditioning system: It is suitable for domestic air-conditioners, multi-unit air-conditioners and commercial central air-conditioners using HFC refrigerants (e.g. R410A, R407C, etc.).

- Industrial refrigeration: In the field of industrial refrigeration, such as cold storage in food processing factories, low-temperature reactors in the chemical industry, and low-temperature storage equipment in pharmaceutical factories.

- Commercial refrigeration: Commercial refrigeration equipment such as cold cabinets in supermarkets, kitchen cold rooms in hotels, refrigerated display cabinets in convenience stores, etc.

- Cryogenic machines: Such as cryogenic experimental chambers, some cryogenic test equipment in aerospace field, etc.

Common Models
1.FVC32D
Dynamic viscosity: 32.4mm²/s at 40℃, 5.12mm²/s at 100℃.
Viscosity index: 78.
Colour tone (ASTM): L0.5.
Ignition point: 178°C.
Volume resistance rate(RT): 7×10¹³Ωcm.
Copper plate corrosion: 1 (1B) at 100°C x 1hr.
Trace moisture: 100ppm.
Hazardous material classification: Class IV, Division III petroleum.
Applications: Suitable for low-temperature environments (flow point -47.5°C), suitable for high-precision refrigeration equipment.

2.FV50S
Dynamic viscosity: 66.6mm²/s at 40°C, 8.04mm²/s at 100°C.
Viscosity index: 84.
Density: 0.9369g/cm³.
Colour tone (ASTM): L0.5.
Ignition point: 204°C.
Flow point: -37.5°C.
Full acid value: 0.01mgKOH/g or less.
Volume resistance (RT): 6×10¹³Ωcm.
Copper plate corrosion: 1 (1B) at 100°C x 1hr.
Trace moisture: 100ppm.
Hazardous material classification: Class IV, Division III petroleum.

3.FVB68D
Dynamic Viscosity: 64.4mm²/s at 40°C, 7.68mm²/s at 100°C.
Viscosity index: 77.
Density: 0.9263g/cm³.
Colour tone (ASTM): L0.5.
Ignition point: 196°C.
Flow point: -37.5°C.
Volume resistance (RT): 7×10¹³Ωcm.
Copper plate corrosion: 1 (1B) at 100°C x 1hr.
Trace moisture: 100ppm.
Hazardous material classification: Class IV, Division III petroleum.
Applications: Medium-high viscosity, suitable for high load compressor and wide temperature range working condition.

McQuay Refrigeration Oil

Hanbell 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.