SC Refrigeration Practice Questions - South Carolina Refrigeration Contractor Examination Exam

While brazing refrigerant copper, the interior of the tube shall be purged with an inert gas primarily to:

Increase joint temperature so a lower-melting solder can be used Displace oxygen and prevent internal copper oxide scale that would later travel to valves and driers Pressurize the system to its design pressure during the braze Replace the need for a clean, fluxed joint surface

Correct Answer:

Displace oxygen and prevent internal copper oxide scale that would later travel to valves and driers

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