What is the name of the tube or pipe used to carry refrigerant gas from the evaporator to the compressor?

• A. Suction line
• B. Liquid line
• C. Discharge line
• D. Oil line

Answer: (A)

The suction line is the path that carries refrigerant gas from the evaporator to the compressor. After the refrigerant absorbs heat in the evaporator, it becomes low‑pressure gas and is drawn into the compressor through this line on the system’s low‑pressure side. The name “suction” comes from the compressor pulling the gas in. The other lines serve different roles: the liquid line carries high‑pressure liquid refrigerant from the condenser to the evaporator, the discharge line carries high‑pressure gas from the compressor to the condenser, and the oil line distributes lubrication oil within the system.