What is the first step in refrigerant removal for an R-11 or R-123 system?

The first step in refrigerant removal for an R-11 or R-123 system involves removing liquid refrigerant. This initial process is crucial because it ensures that the refrigerant is efficiently extracted from the system without causing harm or creating pressure imbalances. Liquid refrigerant must be handled carefully, as it can cause issues if released into the atmosphere or if vapor is collected first, potentially leading to incomplete system evacuation.

Beginning with the removal of liquid refrigerant helps in managing the recovery process effectively, as it allows the technician to address the larger quantity of refrigerant present in the liquid phase before transitioning to vapor. Additionally, proper refrigerant removal aligns with environmental regulations set forth by the EPA, which mandate that refrigerants should be recovered and not released into the atmosphere.

Other steps such as checking for leaks are essential for system maintenance and safety, but they do not directly relate to the immediate process of refrigerant removal. Evacuating vapor would come later in the process after the liquid has been adequately addressed, and recharging the system with refrigerant is a step that occurs after service has been completed, making it irrelevant at the initial stage of refrigerant removal.