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re: Ac secondary drip pans have no drain…should they?

Posted on 11/8/23 at 9:04 am to
Posted by doubleb
Baton Rouge
Member since Aug 2006
36196 posts
Posted on 11/8/23 at 9:04 am to
When I built my houses, I put the float switch and I put a drain on the secondary pan and ran the outflow line to a soffit vent so that I could see when a problem.

That works well.

If you connect to the HW relief valve discharge line it’s possible that if it discharged it could back up into your secondary pan and flood your attic.

If you connect to the drain line off the water Heater pan, I do not see an issue with that if the AC unit pan is higher than your water pan.
If it’s lower you don’t want that either.
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