What steps should be taken before using a recovery unit to remove a charge?

• A. Check service valve positions only
• B. Check recovery unit oil level only
• C. Evacuate recovery unit only
• D. Check service valve positions, Check recovery unit oil level, Evacuate recovery unit

Answer: (D)

Before using a recovery unit to remove a charge, you must prepare by setting the service valve positions, verifying the unit’s oil level, and evacuating the unit. The service valve positions determine the correct flow path for refrigerant and help isolate the circuit so refrigerant doesn’t leak into unwanted paths. The oil level matters because the compressor inside the recovery unit needs proper lubrication to run reliably and protect the equipment; too little or poor-quality oil can cause damage and reduce recovery effectiveness. Evacuating the unit removes air and moisture from the unit itself, which helps prevent contamination of the recovered refrigerant and improves the unit’s performance. Doing all three steps together ensures safe operation, effective recovery, and regulatory compliance.