What should you guard against after transferring liquid refrigerant between a recovery unit and a refrigeration system?

After transferring liquid refrigerant between a recovery unit and a refrigeration system, it is important to guard against trapping liquid refrigerant between the service valves. This is crucial because when liquid refrigerant is trapped in this way, it can lead to increased pressure in the servicing equipment, which may cause damage or present safety hazards. Properly managing the flow of refrigerant and ensuring that it can move freely to prevent pressure buildup is essential for safe and effective refrigerant handling.

While other considerations, such as avoiding mixing refrigerants or not allowing refrigerant to vent into the atmosphere, are important within the context of refrigerant handling, the specific scenario of transferring liquid refrigerant directly relates to the risk of trapping refrigerant between the service valves. Proper technique during the transfer process mitigates this risk, allowing for safe servicing and recovery operations.