I have a patient-care facility building where Ruud 90+ Achiever furnaces were installed. Whoever did the condensate line from the pvc flue pipe leaving the furnace housing started out with pvc piping (1/2")and ended up in a horizontal run where it was switched to copper (no condensate pump is involved; only gravity). The length of this copper pipe run varies with each furnace (the minimum length being approximately 14 feet) but it terminates in a storm drain. These units were installed in the attic of the building. I contacted Ruud and they didn't me a bonafide answer.
Question: Will the acidic condensate rot the copper piping over time? I have only used pvc drain line piping on any high efficiency furnace I ever installed, so this install raised a possible red flag. Don't ask about local building codes, this is a government project. Oh yeah, no neutralizer device was installed either.
Anybody have any experience with what may take place down the road if left this way?