What must be ensured before the operation of refrigerant-containing systems erected on the premises?

Before refrigerant-containing systems can be operated, it is crucial that they are tested and proved tight. This step is essential to ensure that the system is free from leaks, which can pose serious safety hazards, including environmental concerns due to the release of refrigerants into the atmosphere. Leak testing helps to identify and rectify any issues prior to operation, thus preventing potential system malfunctions and ensuring efficient functioning.

In the context of mechanical systems, tightness tests are typically conducted using methods such as pressure testing with nitrogen, using a manometer to check for any drops in pressure, or employing electronic leak detectors. This verification process ensures that the system is sealed correctly and that refrigerants will not escape during operation, thus safeguarding both people and the environment.

While visual inspections, cleaning and sanitizing, and proper labeling are all important aspects of maintaining and operating refrigeration systems, the primary concern prior to their operation centers around ensuring that they do not leak. This focus on tightness testing aligns with best practices and regulatory requirements in the field.