If you discover corrosion on the copper pipe of the connecting line (line set) in your mini-split air conditioner, it's important to address it promptly to prevent further damage. Here are steps you can take to manage copper pipe corrosion:

• Assess the Corrosion: Determine the extent of the corrosion. If it's superficial, an immediate replacement may not be necessary. However, if the corrosion has compromised the structural integrity of the copper tubing (e.g., pitting corrosion), replacing some or all of the tubing will likely be required.

• Clean the Corroded Area: For mild corrosion, clean the affected area using an appropriate metal cleaner and a soft brush. Ensure thorough drying of the treated area after cleaning.

• Apply Anti-Corrosion Treatment: After cleaning, consider applying an anti-corrosion coating or protector suitable for copper. This step helps inhibit future corrosion and extends the lifespan of the tubing.

• Replace Damaged Sections: Severely corroded sections of the copper tubing should be replaced. This task typically requires the expertise of an HVAC technician who can solder and ensure proper sealing of the system after replacement.

Taking these measures can effectively manage copper pipe corrosion in your mini-split air conditioner, preserving its performance and longevity.