SC Air Conditioning Practice Questions - South Carolina Air Conditioning Contractor Examination Exam

When brazing ACR copper refrigerant tubing, dry nitrogen should be purged through the tube primarily to:

Prevent internal copper-oxide scale that later circulates as debris Convert remaining mineral oil into POE oil Pressure-test the finished joint at 600 psig Raise the brazing temperature so the filler metal flows faster

Correct Answer:

Prevent internal copper-oxide scale that later circulates as debris

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