robert1966 Posted August 20, 2010 Report Share Posted August 20, 2010 What do you think about primary HVAC lines on homes that drain into one or more of the sinks. I know this is allowed in our area and is quite common, even in my home. But these lines and the P-trap at these sinks seem to clog a lot more frequent than when the HVAC lines drain to the exterior. I have spoke with several master plumbers and they all seem to agree that this is a bad system. Input is appreciated Link to comment Share on other sites More sharing options...
Marc Posted August 20, 2010 Report Share Posted August 20, 2010 The biggest problem that I have seen with HVAC drains is that the 1 1/2" or 2" drain that is provided by the plumber is too far away from the evaporator coil. The AC contractor responds by installing a much longer 3/4" condensate drain line to reach it. That 3/4" is going to plug up more easily and more often than the plumber's pipe. It's seldom a problem when kept short, but lengthen it and it's a constant headache especially with long level runs. Marc Link to comment Share on other sites More sharing options...
Erby Posted August 22, 2010 Report Share Posted August 22, 2010 What, AC guys don't understand that crap runs downhill, not level? And they keep installing those "pre-formed running traps" that manufacturer's instructions say "DON'T USE"l. - Link to comment Share on other sites More sharing options...
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