If a large leak of refrigerant occurs in an enclosed area and no self-contained breathing apparatus is available, then the technician should:

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In enclosed spaces, a large refrigerant leak can create an oxygen-deficient or toxic atmosphere, so without proper respiratory protection the safest move is to get people out and start ventilation. Vacating protects you from inhaling concentrated vapors or displacing scarce oxygen, while ventilating helps dilute and remove the refrigerant from the area. Doing one without the other isn’t enough: staying to monitor or ventilating alone won’t reduce the immediate risk to you, and you should not re-enter until the area is declared safe and you have the proper protection. If anyone is exposed or symptoms develop, call emergency services after you’ve exited to a safe location.