When retrofitting a CFC/mineral oil system to an HFC-based refrigerant, what is required?

When retrofitting a system that traditionally uses CFCs and mineral oil to one that utilizes HFC-based refrigerants, extensive oil flushing is crucial to ensure system compatibility and efficiency. Mineral oils do not mix well with HFC refrigerants, which typically require different lubricant characteristics.

Contaminating the new refrigerant with residual mineral oil can lead to several issues, including poor lubrication, decreased efficiency, and even mechanical failure. Consequently, comprehensive oil flushing is necessary to completely remove the old mineral oil and any contaminants from the system, allowing for the proper functioning of the new refrigerant and ensuring the system operates effectively with the correct lubricant.

This process not only safeguards the integrity of the new HFC refrigerant but also helps maintain system performance over time, reducing the risk of future complications.