If you find the pressure of a refrigeration system containing a Class I or Class II refrigerant to be opened for the accomplishment of repairs is 0 psig, what must be done?

Correct Answer: Option D — do not attempt to recover the refrigerant and repair the leak before pulling a vacuum on the system

A system reading 0 psig indicates atmospheric pressure equalization and potential ambient air contamination. Under EPA rules, active refrigerant recovery is impossible or ineffective; the leak must be repaired and a deep vacuum pulled before introducing any refrigerant.