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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McQuay Refrigeration Oil

McQuay refrigeration oils are used in a wide variety of central air conditioning and refrigeration systems. McQuay's refrigeration oils are available in a variety of models, including Oil A, Oil B, Oil C, Oil E, Oil F, and more. These refrigeration oils typically have excellent lubricity, thermal and chemical stability, protecting compressors from wear and corrosion while improving the overall efficiency of the refrigeration system.

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Advantages of McQuay Refrigeration Oil

1. Excellent viscosity and temperature characteristics

-High viscosity index: Viscosity index ≥ 120 (such as A oil 121, B oil 120), to ensure good fluidity at low temperature start-up, stable viscosity at high temperature operation, adapt to a wide range of temperature conditions.

-Suitable for different models: A oil (ISO VG 32) is suitable for high speed centrifugal machines (such as WTC series), B oil (ISO VG 68) is suitable for low speed and high load screw machines (such as MHS/MCS series).

2. Low and high temperature performance
-Ultra-low pour point: A oil pour point -46℃, B oil -39℃, to ensure the normal oil return under low temperature environment and prevent the evaporator from clogging.

-High flash point: A oil flash point 258 ℃, B oil 270 ℃, significantly higher than the compressor exhaust temperature (usually ≤ 150 ℃), to avoid high-temperature decomposition and coking.

3. Chemical stability and purity

-Extremely low acid value (<0.05 mgKOH/g), strong antioxidant and anti-hydrolysis ability, reducing the risk of acidic corrosion.

-High purity: Water content <40ppm, low impurity content, prevent copper plating phenomenon and motor insulation performance degradation.

Common Models

1.Model:A Oil

Applicable compressor models:Centrifugal compressors(WTC/WCC Series)

Viscosity@40℃ (cSt):32.5

Flash point (℃):258

Pour point (℃):-46

Acid value (mgKOH/g):<0.05

2.Model:B Oil

Applicable compressor models:Screw compressors (MHS/MCS series)

Viscosity@40℃ (cSt):66.6

Flash point (℃):270

Pour point (℃):-39

Acid value (mgKOH/g):<0.05

The following are the customer’s evaluations of our products and services.

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Dunham-Bush Refrigeration Oil

Daphne 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.