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Old 04-17-2014, 07:19 AM   #16
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Originally Posted by oh'mike View Post
You have an S trap---that's bad--vent must be allow air in above the P=trap--

Remove all of your piping---start pipe at the floor---add a T- for a P-trap--
Then place the AAV above the T---
Can someone or yourself draw a diagram on how it should be set up? I'm not 100% sure on how this would help. The current AAV install is higher then the trap.

Would this current install cause positive pressure? Like I said before air is trying to come out of the AAV vs being sucked in. There is currently positive pressure. Would the way you described setting it up eliminate the positive pressure?
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Old 04-17-2014, 07:34 AM   #17
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This is the general idea but you want the AAV located higher.
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Old 04-17-2014, 07:51 AM   #18
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You need to put the vent where Mike and djlandkpl said- that is the proper location.

If you have drainage problems after that- you need to clean the line.
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Old 04-17-2014, 08:15 AM   #19
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Is the current location of mine definitely causing the positive pressure? There doesn't seem to be a clog in the drain as the 2nd I unscrew it the drain flows very smoothly without ever backing up.

Thank you for the picture reference. I see what you guys are talking about. Any idea's on how to incorporate that into my current setup? Seems hard to do since it's a straight drop right after the trap.
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Old 04-17-2014, 08:29 AM   #20
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I am not a plumber but I like answering questions.
I am guessing this is the reason we are not allowed to use S traps in my area.
Until a plumber gives you the correct answerer, I would get a P trap and attach it to the side of the T and run the vent off the top of T.
Or you could wait for a Plumber.
Edit: Sorry completely missed page 2

Last edited by Robpo; 04-17-2014 at 08:31 AM.
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Old 04-17-2014, 08:47 AM   #21
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Quote:
Originally Posted by Robpo View Post
I am not a plumber but I like answering questions.
I am guessing this is the reason we are not allowed to use S traps in my area.
Until a plumber gives you the correct answerer, I would get a P trap and attach it to the side of the T and run the vent off the top of T.
Or you could wait for a Plumber.
Edit: Sorry completely missed page 2
Is this like what you guys are talking about? The S trap would get turned into a P and I'd put a 90 curve on it to hook into the T pipe that is being moved up from the bottom. The AAV would go on top of the T joint. Where the old T joint was it'll just be a straight run up, correct? Will this solve my positive pressure problem?

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Old 04-17-2014, 08:59 AM   #22
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Your diagram will work short term.

I'm not a pro but I think you still have an S trap if your trap comes up to the tee and drops immediately. E or Mike can verify.
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Old 04-17-2014, 09:09 AM   #23
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http://www.diychatroom.com/f7/legal-198636/ This thread might clear it up for you. Only difference is I use real vent. start from #1
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Old 04-17-2014, 09:16 AM   #24
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I don't mind having an S trap, I just want the AAV to work.

Can anyone explain why my current set up would be causing positive pressure?
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Old 04-17-2014, 09:26 AM   #25
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My guess would be that the water going down the drain and through the trap until it got to the T would be causing positive pressure. I wouldn't cause neg pressure until it passed the T. Assuming you are meaning pos pressure to vent.
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Old 04-17-2014, 09:40 AM   #26
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Quote:
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My guess would be that the water going down the drain and through the trap until it got to the T would be causing positive pressure. I wouldn't cause neg pressure until it passed the T. Assuming you are meaning pos pressure to vent.
Yes, I took the AAV off and when the sink would drain I put a plastic bag over the hole. The bag started to fill with air like a hot air balloon. The picture I drew on looks like a way that it could be set up correct?

Thank you very much for your help and quick reply's!
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Old 04-17-2014, 09:44 AM   #27
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I don't mind having an S trap, I just want the AAV to work.

Can anyone explain why my current set up would be causing positive pressure?
I can't explain it, but my guess would be because your current set-up is causing a piston like reaction, forcing air into your AAV and causing it to close when the sink/dish washer are draining. Nothing wrong with the AAV's, they are working properly. Just a thought. As Mke, Javiles and "E" have said, your current set-up is wrong.

You can google "positive air pressure in sewer pipes" or go to the library and get a more in-depth answer to your question.

Stay tuned, there is a civil engineer and experienced plumbers who would be able to explain it better. Thanks.
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Old 04-17-2014, 09:53 AM   #28
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I can't explain it, but my guess would be because your current set-up is causing a piston like reaction, forcing air into your AAV and causing it to close when the sink/dish washer are draining. Nothing wrong with the AAV's, they are working properly. Just a thought. As Mke, Javiles and "E" have said, your current set-up is wrong.

You can google "positive air pressure in sewer pipes" or go to the library and get a more in-depth answer to your question.

Stay tuned, there is a civil engineer and experienced plumbers who would be able to explain it better. Thanks.
Great! Thank you for that answer! I'm really looking forward to hearing from an experienced plumber!
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Old 04-17-2014, 10:00 AM   #29
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Originally Posted by jkendt1989 View Post
Great! Thank you for that answer! I'm really looking forward to hearing from an experienced plumber!
Your welcome. Hope you get it working the way you want soon.
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Old 04-17-2014, 10:39 AM   #30
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May be something like this would work for you. You might still need a way to connect the copper pipe. But again I would wait for a plumber. It would solve the pos pressure issue I think. The way people are today always wanting to sue you might not get an answer from a plumber because it is probably not code.
Air Admittance Valve Not Opening!-strap.jpg

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