Which standard is referenced for verifying the purity of reclaimed refrigerants?

The correct choice is ARI Standard 700, which specifically addresses the purity of reclaimed refrigerants. This standard outlines the specifications that reclaimed refrigerants must meet to ensure they can be safely reused in HVAC systems. It details the acceptable contaminants and limits for various properties, such as moisture, acidity, and specific substances that can affect the performance and safety of refrigerants. Adhering to ARI Standard 700 helps technicians maintain compliance with industry practices and facilitates the safe handling of reclaimed refrigerants, ultimately protecting both equipment and the environment.

Other standards mentioned may address different topics related to refrigeration or HVAC systems but do not specifically focus on the purity requirements for reclaimed refrigerants like ARI Standard 700 does. For example, ASHRAE Standard 100 deals with energy efficiency in buildings, EPA Guidelines 302 focuses on the regulation of refrigerants, and IIAR Standard 9 pertains to ammonia refrigeration systems. Therefore, they are not relevant to verifying the purity of reclaimed refrigerants.