Refrigeration
HFC & HFO Refrigeration
HFC and HFO refrigeration compressor lubricants are POE-based formulations selected for systems using refrigerants such as R134a, R404A, R507A, R448A, R449A, R450A, R513A, R1234yf, R1234ze(E) and related refrigerant blends.
POE lubricants provide the refrigerant compatibility, low-temperature performance and oil-return behaviour required by many stationary HFC and HFO refrigeration compressors. Their interaction with the refrigerant can also reduce operating viscosity, making the specific refrigerant, temperature and compressor conditions important selection factors.
The selected lubricant chemistry for NEXT HFC and HFO refrigeration applications is POE. These formulations support commercial refrigeration, cold storage, food processing, industrial cooling, chillers and other systems using fluorinated refrigerants.
Key takeaways
- The selected lubricant chemistry for NEXT HFC and HFO refrigeration applications is POE.
- POE lubricant selection must be matched to the specific refrigerant or refrigerant blend, compressor design and operating envelope.
- Refrigerant dissolved in the lubricant can reduce its operating viscosity, particularly under high-pressure or low-oil-temperature conditions.
- Suitable refrigerant-lubricant miscibility supports oil return, but the lubricant must still maintain sufficient viscosity inside the compressor.
- POE is hygroscopic, making moisture control, correct storage, system evacuation and effective filtration particularly important.
process, application & compressor
How HFC & HFO Refrigeration Works and the Compressor's Role
An HFC or HFO refrigeration system removes heat by evaporating the refrigerant at low pressure. After compression, the higher-pressure refrigerant rejects heat and condenses before passing through an expansion stage and returning to the evaporator.
The compressor raises the low-pressure refrigerant vapour to the pressure required for condensation and heat rejection. Reciprocating, rotary screw, scroll and centrifugal compressor designs are used depending on the refrigerant, cooling capacity, temperature range and application.
The lubricant protects bearings, rotors, cylinder walls, scroll sets and other moving components while contributing to sealing, cooling and reliable compressor operation. Because some lubricant circulates with the refrigerant, suitable miscibility, oil return and operating viscosity are essential throughout the refrigeration system.
Supermarket & Food Retail
HFC, HFO and HFO/HFC refrigerants are used in supermarket display cases, freezers, cold rooms and other commercial refrigeration systems.
Cold Storage & Food Processing
These refrigerants are used across refrigerated warehouses, food-processing facilities, blast chillers and temperature-controlled production environments.
Industrial & Process Cooling
HFC and HFO systems are used for controlled process cooling in manufacturing, laboratories, pharmaceutical production and other industrial applications.
Chillers & Building Cooling
Refrigerants such as R134a and R1234ze(E) are also used in chillers and other cooling systems where compressor lubricant selection must match the specific refrigerant and compressor platform. Danfoss, for example, lists R1234ze(E) for chiller, refrigeration and heat-pump applications.
Lubricants
Lubrication Considerations
HFC and HFO refrigeration places particular demands on compressor lubricants because lubricant behaviour depends strongly on the specific refrigerant, temperature range, compressor design and moisture level.
Refrigerant Compatibility and Oil Return
POE lubricants are used with many HFC and HFO refrigerants because they provide suitable refrigerant compatibility and oil-return behaviour.
The level of miscibility must be appropriate across the system’s operating-temperature range. Insufficient oil return can allow lubricant to accumulate in evaporators, pipework and heat exchangers while leaving the compressor with an inadequate oil level.
Thermal and Chemical Stability
The lubricant must resist oxidation, acidity, viscosity change and deposit formation under the expected discharge and oil temperatures.
High condensing temperatures, high compression ratios, continuous operation and inadequate cooling can increase lubricant stress and shorten its service life.
Moisture Absorption and Hydrolysis
POE lubricants are hygroscopic and can absorb moisture from the surrounding atmosphere.
Excessive moisture can promote hydrolysis, acid formation, corrosion and lubricant degradation. Containers should remain sealed, exposure to ambient air should be minimised and proper evacuation and drying procedures should be followed during servicing.
Refrigerant Conversions
Changing refrigerant does not automatically mean changing lubricant chemistry. For example, R404A, R448A and R449A are commonly used with POE, so a conversion between these refrigerants remain on a POE lubricant.
Selection
Operating Conditions Affecting Lubricant Selection
Lubricant selection depends on the complete operating envelope of the HFC or HFO refrigeration system. The refrigerant name and fresh-oil viscosity grade alone are not sufficient for final selection.
- Evaporating and Condensing Conditions Influence refrigerant concentration in the lubricant, compressor loading, pressure ratio and discharge temperature.
- Oil Temperature and Refrigerant Dilution Determine the effective viscosity and film strength of the oil-refrigerant mixture inside the compressor.
- Discharge Temperature and Thermal Load Influence oxidation rate, viscosity change, deposit formation and the achievable lubricant service interval.
Benefits
Operational Benefits of Correct Ammonia Lubricant Selection
Selecting the lubricant according to the hydrocarbon refrigerant, compressor and operating conditions can provide several operational benefits.
- Stable Operating Viscosity Helps maintain sufficient film strength after the refrigerant dissolves into and reduces the viscosity of the lubricant.
- Reduced Unplanned Downtime Helps prevent lubrication-related wear, overheating, oil-return problems and unexpected compressor shutdowns.
- Extended Component Life Supports protection of bearings, rotors, cylinders, seals and other lubricated compressor components.
- Reliable Oil Return and Lower Consumption Supports effective oil circulation while helping reduce carryover, lubricant losses and frequent top-ups.
- Clean Running and Deposit Control Helps minimise varnish, sludge and deposit formation for cleaner compressor components and reliable oil circulation.
products
HFC & HFO Refrigeration Compressor Lubricants
The following lubricants are available for HFC and HFO refrigeration systems across commercial refrigeration, industrial cooling and air conditioning applications. Final selection depends on the specific refrigerant, evaporating temperature range, compressor type and viscosity grade. If you need assistance selecting the right product, use the recommendation form below or contact our technical team directly.
Cross reference tool
Our technical team can help identify the right product.
TECHNICAL SUPPORT
Lubricant Selection, Technical Support and Compatibility Documentation
NEXT combines application knowledge, laboratory data and an extensive internal cross-reference database to support lubricant selection, conversions and compressor troubleshooting.
Depending on the application, we can provide:
- Application-Specific Product Recommendations Lubricant recommendations based on gas or refrigerant composition, compressor design, operating conditions and current performance issues.
- Lubricant Cross-Referencing Identifies suitable NEXT alternatives by comparing base-oil chemistry, viscosity, application, specifications and operating requirements.
- Compatibility and Conversion Documentation Provides chemistry comparisons, mixture-test data, material compatibility, flushing requirements and top-off or changeover guidance.
- Dilution Data and PVT Graphs Shows how gas or refrigerant concentration, pressure and temperature affect lubricant dilution, density and operating viscosity.
- Troubleshooting and Root-Cause Support Supports investigations into foaming, oil carryover, dilution, deposits, corrosion, high lubricant consumption and reduced oil life.
Frequently Asked question
What type of oil is used with HFC and HFO refrigerants?
Why is POE sensitive to moisture?
Do I need to change the lubricant when switching from R404A to R448A or R449A?
Can I use mineral oil or alkylbenzene with HFC or HFO refrigerants?
Can I replace another POE refrigeration oil with NEXT POE?
Related Applications
Explore Other Refrigeration Applications
CO₂ Refrigeration
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Hydrocarbon Refrigeration
Lubricants for propane, isobutane and other hydrocarbon refrigeration systems.
Industrial Heat Pumps
Compressor lubricants for ammonia, CO₂ and hydrocarbon heat pumps operating under elevated temperature conditions.