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Condensate drain line problem
Our 7 ton A/C coil blower has a condensate line of PVC pipe to the outside wall and through it to the parking area. The line plugged up, several times, even with blowing it clean each time, so we are changing the line from 3/4 to 1 inch pipe.
My service provider says we should put back in the P-trap in the line to prevent any negative pressure which might arise later on, (maybe from clogged filters), from allowing the water to build up in the condensate pan, and overflow.
My worry is that any elbows could be more likely to trap debris, and cause a later blockage. I do realize that a trap of some sort would keep any insects out.
How important is this trap for the drain line?--NBC