NATE HVAC Support Technician Practice Test

Why is it important not to dent refrigerant tubing during installation?

It makes the system aesthetically worse It can cause leaks and reduce system efficiency It increases refrigerant capacity It has no effect on performance

Correct Answer:

It can cause leaks and reduce system efficiency

Explanation:

Denting refrigerant tubing matters because the lines carry high-pressure refrigerant and lubricating oil, and any dent creates a weak spot that can crack or develop a leak. A leak means refrigerant charge is lost, reducing heat transfer efficiency and causing the system to work harder, which can overheat the compressor. The deformation also narrows the tube locally, increasing pressure drop and reducing flow to the evaporator, which lowers cooling capacity. Plus, repeated pressure cycling around a dent can cause the wall to fatigue and fail sooner. For these reasons, avoid dents and use smooth bends with proper radii during installation to preserve performance and prevent leaks.

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