NV C-21 Refrigeration And Air Conditioning Practice Questions - Nevada C-21 Refrigeration And Air Conditioning Contractor Examination Exam

While brazing a copper ACR joint on a C-21 split-system line set, a dry nitrogen purge is used primarily to:

Increase the braze melting temperature so the joint cools faster Pressurize the system to the high-side relief setting during the braze Keep oxygen out of the tube so copper-oxide scale does not form inside the circuit Replace the need for a post-braze pressure test

Correct Answer:

Keep oxygen out of the tube so copper-oxide scale does not form inside the circuit

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