What should a technician do after reaching the required recovery vacuum on an appliance?

After reaching the required recovery vacuum on an appliance, a technician should wait for at least a few minutes to see if the system pressure rises. This step is crucial because it provides an opportunity to identify any potential leaks in the system. If there are leaks, the pressure will start to rise, indicating that the vacuum has not been effectively maintained.

Waiting allows the technician to ensure that the appliance can hold vacuum before proceeding with any further actions, such as reconnecting components or performing maintenance. Establishing whether the vacuum is stable is a critical part of the recovery process, as it verifies that the system is leak-free and ready for the next steps.

The other options do present actions that may seem reasonable but lack the necessary precaution. Initiating a pressure test right after reaching vacuum does not confirm the stability of that vacuum. Disconnecting the recovery machine immediately without verifying the vacuum level could lead to contamination or improper function due to potential leaks. Starting the compressor is not advisable, as it would disturb the recovery process and could lead to inaccurate readings of the vacuum level. Therefore, allowing time for the system pressure to stabilize is the most prudent action following vacuum recovery.