After installing and opening a piercing access valve, if the system pressure is _____ do not begin the recovery procedure.

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Starting recovery should only occur when there is refrigerant under pressure to be recovered. If the system reads zero psig after installing and opening the piercing access valve, there’s no refrigerant pressure to recover, so beginning the recovery would draw room air into the system and contaminate the refrigerant. That’s why zero psig is the situation when you should not start the recovery procedure.