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

When an opened refrigeration system reads 0 psig, all refrigerant has already escaped or boiled off. Attempting recovery is unnecessary; the technician must proceed directly to locate and repair the leak before pressure testing and evacuating the system.