When should a newly installed refrigeration system be checked for leakage?

The correct choice, which is that a newly installed refrigeration system should be checked for leakage immediately after being put into service, is vital for ensuring the safety and efficiency of the system. Conducting a leak check at this stage allows technicians to confirm that the system is functioning correctly and to identify any potential issues that could cause refrigerant loss, which not only compromises the system's performance but also poses environmental risks.

Checking for leaks right after the system is put into service is crucial because it ensures that all components are sealed properly and functioning as intended. If leaks are detected at this point, they can be addressed immediately, which prevents ongoing refrigerant loss and the associated costs and environmental impacts that occur over time.

The other options do not align with best practices for leak detection. For instance, checking before commissioning does not assess the system's performance during actual operation, while waiting one month after operation may allow undetected leaks to cause damage or inefficiencies. Checking after completing the installation also does not account for any potential problems that may arise once the system starts operating under load. Therefore, immediate checks post-commissioning are essential for optimal system reliability and environmental stewardship.