To ensure the purge unit will perform to its published efficiency rating, it should be verified as ARI-certified to which standard?

The correct answer is B, Standard 580. This standard specifically applies to the performance and testing of refrigerant reclamation and recycling equipment, including purge units. When a unit is ARI-certified to Standard 580, it indicates that it has been tested under specific conditions to ensure that it meets the efficiency and functionality claims made by the manufacturer.

This certification is crucial for technicians because it establishes a baseline of trust regarding the reliability and effectiveness of the equipment in managing refrigerants responsibly, minimizing environmental impact, and maintaining compliance with regulations. Ensuring that equipment like a purge unit is ARI-certified to this standard helps technicians confirm that they are using tools that can effectively remove contaminants from refrigerant to restore it to a reusable state.

The other standards mentioned do not pertain specifically to the performance efficiency of refrigerant reclamation systems. Standard 500 typically relates to the testing methods for various HVAC components, Standard 600 aligns with performance guidelines for portable refrigerant recovery equipment, and Standard 700 focuses on the purity standards for recovered refrigerants.