GA HVAC Practice Questions - Georgia Conditioned Air Contractor License (Class I II) Exam

Which practice best limits internal copper-oxide scale while brazing field-installed refrigerant tubing?

Flow a low-pressure dry-nitrogen purge through the tubing while brazing Pressurize the tubing with oxygen while the torch is applied Seal both tubing ends so heated air remains trapped inside Flow moisture-bearing shop air through the tubing

Correct Answer:

Flow a low-pressure dry-nitrogen purge through the tubing while brazing

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