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

Question: 1 / 400

Why must refrigerant in the suction line be slightly warmer than the saturation temperature?

Ensure proper oil return

Refrigerant in the suction line must be slightly warmer than the saturation temperature in order to ensure proper oil return to the compressor. If the refrigerant is too cold, it may cause the oil to condense and accumulate in the compressor, potentially leading to issues such as reduced lubrication and mechanical damage. Choices B, C, and D are incorrect options because they do not directly address the issue of proper oil return. Preventing excessive energy use, preventing liquid slugging of the compressor, and reducing discharge pressure may be potential benefits of having slightly warmer refrigerant, but they are not the main reason for this requirement.

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Prevent excessive energy use

Prevent liquid slugging of the compressor

Reduce discharge pressure

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