Which type of refrigerant systems must have a certificate of test if they contain 55 pounds or more?

In refrigerant systems, the requirement for a certificate of test comes into play based on the amount of refrigerant they contain. Systems that contain 55 pounds or more of refrigerant require stringent checks and certifications primarily due to environmental considerations and safety protocols. The reason behind this is that larger quantities of refrigerants can pose a greater risk in the event of leaks or failures, which can have significant implications for both safety and environmental impact.

Refrigeration systems, regardless of their specific type, are subject to regulations that often mandate inspections and certifications to ensure efficient operation, compliance with safety standards, and reduced impact on the ozone layer and global warming. Therefore, the requirement for a certificate of test for systems with 55 pounds or more of refrigerant applies universally across all refrigeration systems. This ensures that any potential risks are managed appropriately and that systems function within established guidelines.

Other options like positive displacement, non-positive displacement, and split systems might have their own sets of standards, but the overarching requirement for certification when a system has 55 pounds or more applies to all refrigeration systems, making that the most suitable choice.