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ColoradoGirl 06-18-2013 09:46 AM

Floor Drain for AC Condensate Discharge
I have a condensate discharge pipe from evaporator coils for my AC that runs to a floor drain (has a cover with small holes in it) in basement. Most of the water will go down the drain, but some will pool on top of the drain cover and get the surrounding floor wet. I have a structural wood floor in basement and would like to eliminate this problem. Can I cut more holes in drain cover so that the pipe (PVC pipe with an elbow on the end) can stick directly into the hole and eliminate the pooling water? Or are the better drain covers (one that is concave in middle) to eliminate this problem.

nealtw 06-18-2013 10:07 AM

Welcome to the site: I don't know if there are rules about it but I have seen where a hole is drilled for an elbow to connect the drain.

ColoradoGirl 06-18-2013 10:11 AM

The elbow on the discharge pipe (3/4"?) from AC just sits on top of the floor drain cover right now, most of the water goes down the drain but some will run off of cover onto surrounding wood floor (structural wood basement floor instead of concrete in my neighborhood). Want to eliminate water running off of cover.

nealtw 06-18-2013 10:34 AM

I would think you could drill a hole in the cover so you could stick the elbow right into it.

JoeD 06-18-2013 12:44 PM

The AC drain should definitely turn down into the drain not just run over the top of it. Either cut a hole in the existing drain or make a new cover with a hole in it and add an elbow.

CallMeVilla 06-18-2013 01:03 PM

1 Attachment(s)
I like your thinking Girl ... Condensate lines acn be REALLY gross (see pic below). Here is what you can do:

1. Get a PVC elbow to fit your drain line where it reaches the drain cover.
2. Fit it to the line and with a Sharpie mark the diameter where it hits the drain cover. If it sits above the cover, you can get a short section of drain PVC to fit into it. Mark that diameter on the drain cover. Basic principle: You want the new cover hole to be tight so nothing can get into the drain .... or crawl out of it either. EWW
3. Drill holes and cut the drain cover to fit the new drain pipe extension. If you want to get really crazy, you could use some kitchen/bath silicone to seal it ... but that is probably not necessary.
4. Install the extension in the cover, slide it onto your drain pipe, screw down the cover.

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kok328 06-18-2013 02:42 PM

I believe code requires an air gap between the drain and the pipe thus precluding inserting the pipe into the drain hole.

nealtw 06-18-2013 03:52 PM


Originally Posted by kok328 (Post 88438)
I believe code requires an air gap between the drain and the pipe thus precluding inserting the pipe into the drain hole.

I was afaid of that, do you what the thinking is for that:(

JoeD 06-19-2013 07:21 AM

Sticking an elbow into the drain would still be an air gap unless you seal the drain cover around the pipe.

kok328 06-19-2013 08:39 AM

All air gaps have to do with backflow prevention.
If the drain pipe clogs then the elbow will be below the water level of the drain.
2" clearance is typical for an air gap.

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