New to this site and am glad I stumbled upon it. We have had our third Trane 5-ton package unit plug the evap coil with what appears to be the material from the filter/drier. With the new precedent units, the 5-ton has a spun copper drier. All three are two years old, and none of the units has been worked on in the refrigeration side, just normal maintenance twice a year. Just wondering if any one else has seen this problem. Thanks