SC Packaged Equipment Practice Questions - South Carolina Packaged Equipment - Heat Pump Contractor Examination Exam

While brazing copper refrigerant tubing, dry nitrogen should be flowed through the tube primarily to:

Raise the brazing temperature so the alloy flows faster Prevent internal copper oxide scale from forming on the tube wall Pressure-test the finished joint at the same time it is heated Replace the need for a phosphorus-bearing filler metal

Correct Answer:

Prevent internal copper oxide scale from forming on the tube wall

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