Which group does R-123 fall under as defined by ASHRAE Standard 34?

R-123 is classified under group B1 according to ASHRAE Standard 34, which pertains to refrigerants. This classification indicates that R-123 has low toxicity and presents a low flammability risk.

The ASHRAE classification system categorizes refrigerants based on their toxicity and flammability, using letter designations to streamline identification. With R-123 falling into group B1, it signifies that while R-123 is generally safe for use due to its low toxicity, it is still important for those handling this refrigerant to exercise caution.

Understanding the implications of refrigerant classifications is critical for ensuring safe handling practices in HVAC applications, as well as for compliance with safety standards and regulations. This classification helps technicians recognize potential hazards associated with refrigerants, contributing to a safer working environment.