What action is appropriate if a system's pressure fails to rise after evacuation?

The appropriate action when a system's pressure fails to rise after evacuation is to recheck system connections. This is because a failure to achieve pressure can indicate a leak or an issue with the connections between the recovery equipment and the system. Ensuring that all connections are secure and free of leaks is crucial for the evacuation process to work effectively.

If the connections are loose or damaged, the vacuum may not be maintained, and pressure readings may not reflect the actual state of the system. This step is fundamental in troubleshooting and ensuring the integrity of the system before proceeding with any further actions, such as removing the compressor or restarting the recovery process.

Restarting the recovery process might be premature if the connections haven't been verified, as that could lead to further complications or wasted effort. Similarly, removing the compressor without first addressing the potential connection issue could lead to unnecessary service actions and system downtime. Properly checking connections ensures that the system is correctly serviced and avoids any unnecessary risks.