ESCO Air Conditioning Practice Exam 2026 – The All-in-One Guide to Exam Success!

Question: 1 / 400

In what state is refrigerant in the suction line during normal operation?

High pressure liquid

High pressure vapor

Low pressure liquid

Low pressure vapor

The refrigerant in the suction line during normal operation is in a low-pressure vapor state. This is because, after absorbing heat from the air or water in the evaporator coil, the refrigerant evaporates into a vapor that is drawn into the compressor via the suction line.

In air conditioning systems, the evaporator operates at low pressure, and as the refrigerant absorbs heat, it changes from a low-pressure liquid to a low-pressure vapor. The compressor then compresses this vapor, increasing its pressure before sending it to the condenser. The role of the suction line is crucial in ensuring that the compressor receives this vaporized refrigerant to maintain the refrigeration cycle effectively.

This understanding emphasizes the importance of each component's function in the air conditioning system, particularly how the state of refrigerant impacts cooling efficiency and system performance.

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