Under what code group of ASHRAE standard 34 does R123 fall?

R123 is classified under the B1 group of the ASHRAE Standard 34. This classification indicates that R123, a medium-pressure refrigerant, is of low toxicity and has a lower flammability risk when compared to other groups. Specifically, the B group relates to refrigerants characterized by their lower flammability levels, while the 1 designation within this group signifies an acceptable low toxicity level. Understanding this classification is essential for ensuring safe and appropriate handling, storage, and application of refrigerants in HVAC systems. Knowledge of ASHRAE standards and classifications helps technicians comply with safety regulations and make informed decisions about refrigerant use in different applications.