Which option accurately describes the refrigerant recovery process from an R-123 system?

The refrigerant recovery process from an R-123 system typically begins with the removal of liquid refrigerant followed by vapor recovery. Starting with liquid removal is crucial because it allows the system to be safely emptied of the refrigerant to prevent any potential for overpressurization and to ensure that the recovery process is efficient. This method minimizes the amount of pressure and temperature changes that can occur when liquid refrigerant is released, which can lead to potential complications or safety risks. Once the liquid refrigerant has been adequately removed, the system can then switch to vapor recovery, capturing any remaining gaseous refrigerant in the system.

This method ensures a comprehensive recovery process, reducing the risk of refrigerant emissions, and helping maintain compliance with environmental regulations related to refrigerant management.