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Properly Insulated refrigerant lines of aircond are sweating outside and moisture or dew formed along the surface of foam insulation. what will be the possible root cause?

Answers :

The root cause is the temp of the lines are below the Dew Point of the surrounding ambient air. Improper charge, low load/ air flow, wrong insulation, improper superheat, are all items that can cause this condition. You may have to look further into whats going on.
\015\012Hope this points you in the right direction.

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