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Old 03-06-2013, 08:18 AM   #1
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Another Laundry Sink Addition Question...

First, thanks to those of you who helped with my question about adding a laundry sink to my washer drain pipe stand. I have decided to put the sink on a different drain on the other side of the room.

Currently (see attached picture), there is a hose draining AC condensation to that drain and then some other small pvc line running to it from the furnace. Could that small pvc line be to drain off any furnace moisture? It doesn't seem like there is ever anything flowing through it.

Could I...
1) Delete the existing trap (again see picture)
2) Put the sink with p-trap into that drain
3) "T" in the small pvc drain from the furnace under the sink p-trap

Thanks again!
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Old 03-06-2013, 09:06 AM   #2
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You have a condensing furnace which produces water by burning natural gas. If the furnace is running, and not producing condensate, something is wrong. Your trap and condensate lines are probably plugged up with crap. They should be cleaned once a year. Condensing furnaces produce a lot of condensation. Have you had water on the basement floor under the furnace?

I drain my AC and Furnace condensate into a small plastic catch pan that drains right through a hole that goes down through my basement slab into the clean stone below. From there it percolates down through the ground. This works great.

The trap you have is not vented, and could siphon out. It will dry out if the furnace or AC is not running, and you will have sewer gas in your house. If it dries out you could draw sewer gas into your furnace, because I dont see a trap on your AC drain, which is a hose. Bad setup.

I like the "Open Concept" commode, reminds me of my stint in the Military.


" Most people would rather die than think, and most do " Bertrand Russell

Last edited by jagans; 03-06-2013 at 09:11 AM.
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Old 03-06-2013, 09:21 AM   #3
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What if...

I put a "Y" on the existing trap... one branch is connected to the new sink drain, the other remains open for the two condensation lines to drip into (not hard connected). Would sink flow back out of the open part of the "Y"?

I want to avoid putting on a condensate pump, but is that my best option?

Also, is it possible that there is already a trap under the cement and that the above-floor trap was put on for no reason? How could I find out... cheaply?

Thanks for the help!

Last edited by Koellert; 03-06-2013 at 09:23 AM. Reason: Addition
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Old 03-06-2013, 06:38 PM   #4
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Anyone? Would the condensate pump be my best "fix"?

Also, there has to be a trap under the cement... doesn't there?

Home was built in '79. Before the trap in the picture was put on (2-3 years ago) it was just an open pipe. We've never smelled sewer gas.

Thanks again all!
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