If after installing a fitting for recovering the appliance refrigerant you find that the system pressure is 0 psig, what is required?

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The main idea is that you only recover refrigerant if the appliance actually contains refrigerant. A reading of 0 psig means the system isn’t charged with refrigerant at all, so there’s nothing to recover. Therefore, refrigerant recovery isn’t required in this situation.

Options about evacuation, tightening fittings, or replacing the appliance aren’t demanded by a 0 psig reading. Evacuation is a separate step used when you’re preparing to recharge a system that does contain refrigerant, a loose fitting would be addressed if there were a leak or improper connection, and replacing the appliance isn’t indicated by the pressure reading alone.