What is the typical lubricant in R-22 systems, and what is common for R-134a systems?

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Multiple Choice

What is the typical lubricant in R-22 systems, and what is common for R-134a systems?

Lubricant compatibility with the refrigerant is the main idea. R-22 systems traditionally use mineral oil because mineral oil mixes well with R-22 and has been the standard lubricant for these HCFC systems. R-134a systems, on the other hand, typically use polyolester (POE) oil because POE blends are designed to be miscible with the newer HFC refrigerants like R-134a, providing reliable lubrication and oil circulation in these systems. POE oils also handle the higher operating pressures of some systems and are commonly used in modern equipment. One practical takeaway is that when converting an old R-22 system to R-134a, you usually need to replace the mineral oil with POE oil to ensure proper lubrication and oil circulation.

Lubricant compatibility with the refrigerant is the main idea. R-22 systems traditionally use mineral oil because mineral oil mixes well with R-22 and has been the standard lubricant for these HCFC systems. R-134a systems, on the other hand, typically use polyolester (POE) oil because POE blends are designed to be miscible with the newer HFC refrigerants like R-134a, providing reliable lubrication and oil circulation in these systems. POE oils also handle the higher operating pressures of some systems and are commonly used in modern equipment. One practical takeaway is that when converting an old R-22 system to R-134a, you usually need to replace the mineral oil with POE oil to ensure proper lubrication and oil circulation.

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