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Old 03-26-2011, 09:23 PM   #1
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Adding a basement floor drain for A/C Condensor


We want to drain condensation from a basement A/C system into our subslab basement plumbing network rather than having a tube drip into a floor drain. What kind of trap do we need to include to prevent gas from entering our house and A/C system? Is a S-trap above grade sufficient? We rarely use our A/C and I fear that the water required to make an S-trap functional would evaporate in the months when we dont use the system (which is most of the year). Any suggesitons on how to drain our system would be appreciated. A longer version of our situation follows below:

Longer story: 2e are remodeling a basement - the condensation from our A/C system used to drip into a floor drain via a tube. But we are upgrading and I dont want an exposed drain, i would prefer to bury the drain and pipe the condensation tube into it. The A/C will be enclosed in a utility closet so I could do a floor drain with an S-trap below grade, but I write to find out if there is another way to go.

We have just added a new subslab plumbing network and those pipes are (thankfully) still exposed. We forgot to include a way to drain the condensation from the A/C system. Ideally we would like to splice into plumbing for the basement bathroom and shower, but we dont want gases from that system to enter our A/C and house. Its a short distance from the A/C to the main exit pipe for the basement plumbing.

We can easily cut a channel from the A/C and tie a sloped 1.25" pvc into the below grade network, with an S-trap above grade. Or we can dig deeper and install an S trap below grade. Or some other system.

We rarely run our household A/C and I am afraid that any trap that relies on water will fail if/when the water evaporates. Any help you can provide will be appreciated. Thank you.


Last edited by SuzieSawzall; 03-26-2011 at 09:29 PM.
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Old 03-27-2011, 07:02 AM   #2
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Adding a basement floor drain for A/C Condensor


Post a picture !

Talk to a plumbing supply house --there is a small plastic box with a small sump pump inside--
These are designed for just this purpose.

It will allow you to pump the water up and over to the house drain system. Much simpler than cutting cement.

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Old 03-27-2011, 07:43 AM   #3
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Adding a basement floor drain for A/C Condensor


I agree with Mike, a Little Giant condensate pump is the answer. Run the 3/8" tubing to the nearest above grade pipe and tee it in, I've even drilled and tapped a 1/4" NPT thread into a pipe and used an adapter for the tubing. Built in check valve so you get no sewer gas.
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Old 03-27-2011, 04:40 PM   #4
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Adding a basement floor drain for A/C Condensor


I agree that the Little Giant is an excellent, and easier solution than tying into the underslab drains. As plumber666 suggests it could be tied into an existing above grade drain (w/ check valve) or run to a laundry tub nearby if one is available.
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Old 03-27-2011, 05:08 PM   #5
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Adding a basement floor drain for A/C Condensor


As much a question as it is a suggestion, but why can't you just run the condensate line right into sub-slab and let the drainage system take it away.

Punch a hole in the slab, and put the line into the hole and let it drain below the floor.

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Old 03-28-2011, 07:23 AM   #6
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Adding a basement floor drain for A/C Condensor


Run the tube into a hole in the floor? Yipes!!
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Old 03-28-2011, 07:27 AM   #7
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Adding a basement floor drain for A/C Condensor


Quote:
Originally Posted by plumber666 View Post
Run the tube into a hole in the floor? Yipes!!
I remember doing it this way as a young apprentice, many years ago. Why do you think it wouldn't work, there is drainage under slab to handle water at footings.

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Old 03-28-2011, 07:33 AM   #8
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Adding a basement floor drain for A/C Condensor


I'm not sayin it wouldn't work, but they're asking for a good plumbing solution. Used to be with old stack vented homes in the olden days, the kitchen sink had a seperate drain that went to a rock pit if the main stack was too far away. It worked, but it's not up to any code in the world by todays standards.
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Old 03-28-2011, 07:45 AM   #9
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Adding a basement floor drain for A/C Condensor


Really they did that with a sink drain? Been around a long time had never seen that one.

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Old 03-28-2011, 07:51 AM   #10
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Adding a basement floor drain for A/C Condensor


Seen that twice in the last year. One an old farm house, the other a 1937 beautiful art deco lakefront home.

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