What should a technician do in the event of a large leak of refrigerant in an enclosed space without a self-contained breathing apparatus?

In the case of a large refrigerant leak in an enclosed space, the primary concern is the safety of all individuals present. Evacuating and ventilating the spill area is critical because refrigerants can displace oxygen in the air, leading to asphyxiation risks. Ventilation helps to dilute the refrigerant concentration, thereby improving air quality and reducing the potential for harm.

By vacating the area, technicians ensure their safety first, moving to a location where they are not exposed to the hazardous environment. Once outside the danger zone, ventilating the area can be facilitated by opening doors and windows, or using fans, if safe to do so. This helps to quickly reduce harmful gas levels and restore a safe environment for any subsequent actions, such as leak repair.

Other options might focus on containment or escape routes, but they do not adequately address the immediate need to ensure that the area is safe for human presence.