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DavidATX 07-16-2012 10:42 AM

My AC Unit drains into my bathroom sink - Drainage Problems
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I don't know where to find a piece I need for my guest bathroom sink. Home depot doesn't seem to have what I am looking for.

Basically I need a piece to connect to the AC drainage to the u trap in such a way that it won't cause my AC drip pan to overflow. I've tried using a dishwasher connection piece but it doesn't seem to work. Is there a place I can find this piece?

joecaption 07-16-2012 10:47 AM

Not sure what would make you think that was a good idea.
It should be ran outside.

Are you on town sewer or a septic?

DavidATX 07-16-2012 10:53 AM

Well you see I didn't do the plumbing myself. This is something existing that has been in place since the 80's. From what I understand it's not really done this way anymore because of the problem I'm describing. Just wondering if anyone knows what to do here.

biggles 07-16-2012 10:57 AM

the trap on a ac unit anysize even rooftops is to liquid seal the trap line opening into the pan so your not suck/blowing air out thru it.HD/LOWES sells traps for units and it need to be as close as possible to the condensate pan connection to trap asap the air with the water.that sink connect is a trap but the sink drain is compromising the trap idea..TEST:wink:if you put a wet paper towel over the sink opening the unit will trap out the condensate water from the pan using that sink trap...only time the condensate will drain the other way is when the fan is off.forget the pitch don't need one if it is trapped just level into a T

DavidATX 07-16-2012 01:29 PM

Oh duh!
1 Attachment(s)
So you think something like this would work to solve my problem?

biggles 07-16-2012 01:47 PM

thats a start but you still need the trap near the unit..with that idea sure the unit is using the sink trap but if the unit is negative sucking air thru the unit condensate line you will get the sewer smell thru the unit....just do a trap off the unit condensate and get off the sink trap idea.the main reason for a trap is sewer smells but with AC it is the sealing of the water draining out not being effected by air either way

NitroNate 07-16-2012 03:37 PM

so what exactly is the problem causing the line to back up? are you sure the line isn't clogged at some point before it connects to your sink drain? my condensate line is plumbed that way and it is before the sink trap on purpose to keep sewer gases out of the air handler. all the houses in this area have condensate lines plumbed that way. it all depends on the code in your area.

DavidATX 07-16-2012 03:50 PM

For the most part it is clear but recently I got my AC recharged and it's putting out a lot more condensation ... the water from the line doesn't make it through my "trap" so it winds up spilling over ...

NitroNate 07-16-2012 04:09 PM

first thing i would do is let the condensate line free flow into a bucket under the sink and see if any back-up occurs before assuming it has anything to do with the under sink connection. clean out the p trap and clean out the under sink T while you are at it making sure all piping prior to the main drain are free and clear. you could have a partial clog in the condensate line that has just been worsened by the greater flow.

TheEplumber 07-16-2012 06:48 PM

What am I not seeing here? I plumb condensates to floor drains, hub drains, tub wastes, sink tailpieces, auto wash boxes, etc. all the time.
Is your unit higher then the sink? If its a plumbing trap issue why isn't the sink overflowing instead of the pan?

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