Here is one effective technique for repairing smaller copper lines—along with a clear visual demonstration of why flowing nitrogen is critical every single time you braze (cupric oxide forms internally without it!). ​Whenever a refrigerant system is opened up, standard trade practice requires replacing the liquid line filter drier. Follow that up with a deep vacuum, verify system tightness, and use proper charging practices to prevent non-condensables from ruining efficiency. ​Have a great weeke

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