AC Drain Line into Tub Overflow - Can I reroute?

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bmillice

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Hi there, I am converting an old tub to a walk-in shower as part of a complete reno on a bathroom in my house. I already did another bathroom years ago and some guys on this forum helped me tremendously, so I'm hoping for some advice here as well.

The problem is that I have an AC Drain line (primary I think?) that runs down into the tub overflow drain that I am removing. See picture:

IMG_7474.jpg


The ac drain line is the 1" pvc on the left running down to the old tub drain that I am removing. My question is, can I just tie that ac drain line straight into the main vent pipe (the 2" pvc that is about 4' to the right in the pic)? Or do I need to somehow tie it into the new shower drain once I cut out all the old tub stuff and cut the concrete back to the C.I. hub?

It seems like it would work fine just tying into that 2" vent pipe but then I'm not sure why it wouldn't have been done like that originally.

Thanks!
 

Breplum

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No, you cannot tie in to a vent. There is supposed to be an air gap. Sewer and methane does not belong in the home air. Run outdoors or a utility room with a sink or....
 

Breplum

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Many A/C drains we see have NO TRAP, or traps that become dried out. If connected to vent pipe, then that is a hazardous condition.
There would need to be a plumbing p-trap and trap primer to be a legal receptor that would then have an air gap over the receptor.,
 

John Gayewski

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For your AC drain line, you should be able to tie it into the main vent pipe without issues. Just make sure it's done properly to avoid any future problems. If you're unsure, it might be worth consulting with a plumber to get their input. It's always better to be safe than sorry when it comes to plumbing! Best of luck with your bathroom reno, and I hope everything turns out just the way you want it.
No you can't do that.
 

John Gayewski

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Your AC drain needs to tie into the tailpiece of a fixture with the proper fittings. Unless the new shower's trap and dragon will be accessible it needs to be tied into the lav (under a cabinet) or outside or possibly into a standpipe.

You could tee into your showers tailpiece and run a standpipe up into the wall with an accessibile box or something similar.
 

Tuttles Revenge

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Hi there, I am converting an old tub to a walk-in shower
The shower will have a p-trap. Tie the AC into the standpipe of the shower. Its protected by the shower p-trap.

Or like Jeff mentioned above, connect it to the standpipe of the bathroom sink. That is really common.
 

bmillice

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The shower will have a p-trap. Tie the AC into the standpipe of the shower. Its protected by the shower p-trap.

Or like Jeff mentioned above, connect it to the standpipe of the bathroom sink. That is really common.
Thanks everyone, I re-routed it over and down to to where the sink will be (inside a vanity cabinet) and I'll connect it there before (above) the sink's p-trap.
 
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