What is the first step in refrigerant recovery for R-11 or R-123 systems?

The first step in refrigerant recovery for R-11 or R-123 systems is to remove the liquid refrigerant. This step is crucial because it allows for the safe and efficient extraction of the refrigerant from the system. Liquid refrigerants can cause damage and pose safety hazards during the recovery process if not managed correctly. By removing the liquid refrigerant, technicians can minimize the risks associated with pressure fluctuations and ensure that the recovery process can proceed smoothly.

It's also important to note that removing the liquid refrigerant is typically performed before any evacuation or leak checks, as it's essential to handle all refrigerant gas and liquid responsibly and according to regulations. Once the liquid is removed, further steps like checking for leaks or evacuating the system can take place in an organized manner, but clearing the liquid is fundamental to prepare the system for the recovery process.