SC Refrigeration Practice Questions - South Carolina Refrigeration Contractor Examination Exam

Pressure-testing a newly brazed refrigerant circuit shall be done with:

Dry nitrogen (or another inert gas), never oxygen or combustible gas Pure oxygen to 'burn out' residual oil Acetylene from a torch set Unregulated nitrogen at full cylinder pressure (about 2,000 psi)

Correct Answer:

Dry nitrogen (or another inert gas), never oxygen or combustible gas

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