Air Conditioning Repair Certification (ETI) Practice Exam

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What does the term "suction line" refer to in a refrigeration system?

The line bringing refrigerant to the compressor

The line transporting refrigerant to the evaporator

The line returning refrigerant from the evaporator

The term "suction line" in a refrigeration system specifically refers to the line that returns refrigerant from the evaporator to the compressor. When refrigerant evaporates in the evaporator coil, it absorbs heat from the surrounding environment, which causes the refrigerant to change from a liquid state to a vapor state. The suction line is responsible for transporting this low-pressure vapor back to the compressor, where it is then compressed into a high-pressure vapor before being sent to the condenser.

This process is crucial for the refrigeration cycle to function properly, as it ensures that the refrigerant continually flows through the system, absorbing heat in the evaporator and then being recirculated. Understanding the role of the suction line helps in diagnosing issues such as inadequate cooling, as problems in this line can impact the efficiency of the entire refrigeration process.

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The line venting refrigerant to the atmosphere

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