Water leakage from the copper tube (also known as the refrigerant line) of a split air conditioner is not a common issue. The copper tube carries the refrigerant between the indoor evaporator coil and the outdoor condenser unit, and it should not have any water flowing through it under normal circumstances. However, there are a few situations where water may appear to be leaking from the copper tube:
Condensation Drip: The primary reason for water leakage in a split AC is condensation. During the cooling process, the indoor evaporator coil becomes cold, and as warm indoor air passes over it, moisture in the air condenses on the coil. This condensed water is collected in a drain pan below the coil. If the drain pan is damaged, clogged, or improperly installed, water may drip from the copper tube.
Leaking Refrigerant: If the copper tube is damaged, it can lead to refrigerant leakage. When refrigerant leaks, it can cause ice to form on the copper tube or evaporator coil. As the ice melts, it may create the appearance of water leaking from the tube.
Improper Installation: Incorrect installation or improper insulation of the refrigerant line can cause condensation to form on the copper tube itself. This condensation can drip and be mistaken for a leak.
Blocked Condensate Drain Line: The condensate drain line is responsible for carrying the water collected in the drain pan away from the indoor unit. If this drain line is clogged or obstructed, water can back up and appear to leak from the copper tube.
If you notice water dripping or leaking from the copper tube of your split AC, it's essential to have a professional HVAC technician inspect and diagnose the issue. They can identify the actual cause of the leakage and perform any necessary repairs or maintenance. Regular maintenance of your split AC, including checking and cleaning the drain pan and condensate drain line, can help prevent condensation-related issues and ensure the efficient functioning of the unit.