Which design statement correctly describes self-contained recovery units in refrigerant recovery systems?

• A. Requires two service connections
• B. Operates without external power
• C. Requires only one service connection
• D. Requires centralized infrastructure

Answer: (C)

Self-contained refrigerant recovery units come with their own compressor and condenser, so they don’t need to draw refrigerant through both the high- and low-side ports of the appliance. You connect a single service connection to the system, and the unit pulls the refrigerant through that port, then compresses and condenses it inside and stores it in its recovery cylinder. That’s why only one service connection is required. It still needs external power to run the compressor and electronics, and it doesn’t require centralized infrastructure since it’s portable and self-contained. The need for two service connections would apply to system-dependent recovery devices that rely on the appliance’s pressures and both service ports.