After achieving the necessary recovery vacuum on a low pressure appliance, what must technicians do?

After achieving the necessary recovery vacuum on a low pressure appliance, technicians should wait a few minutes to check for pressure rise. This step is crucial because it allows the technician to confirm that the system has effectively reached the desired vacuum level and is holding that vacuum without any leaks. A pressure rise in the system could indicate that there is a leak or issue that needs to be addressed before any further actions, such as charging the system, are taken.

Monitoring for pressure changes also helps to ensure the integrity of the appliance and that it is safe to proceed with recharging it with refrigerant. This practice prevents potential system failures and refrigerant loss, contributing to proper system management and compliance with safety regulations.