A technician plans to braze on a system. What is the correct sequence regarding the refrigerant charge before applying heat?
Explanation
Before brazing, the technician must recover the refrigerant and relieve system pressure so that no refrigerant remains where the flame will be applied, preventing toxic decomposition and dangerous pressure. Brazing first, leaving the charge in, or venting the refrigerant are all unsafe or illegal. Purging with dry nitrogen while brazing is also good practice to prevent oxidation inside the tubing.
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