Before using a recovery unit, you should always check the service valve positions, the oil level of the unit and evacuate and recover an remaining refrigerant in the unit's ______.

• A. receiver
• B. condenser
• C. compressor
• D. drier

Answer: (A)

The main idea is that a recovery unit stores the refrigerant it draws in an internal storage vessel called the receiver. Before using the unit, you must evacuate any remaining refrigerant from that receiver so nothing is left trapped inside. If refrigerant remains, starting the machine or disconnecting hoses can release it, create safety or regulatory issues, and affect proper operation. Checking valve positions and the oil level helps ensure the machine will flow correctly and stay lubricated, while the other components (condenser, compressor, drier) serve different functions and aren’t the storage point for recovered refrigerant inside the unit.