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Thread: Dishwasher needs it's own drain.....

  1. #1
    Join Date
    Feb 2004
    Location
    Modesto, CA
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    2,364

    Dishwasher needs it's own drain.....

    n my current kitchen remodel job I"m moving the location of the dishwsher. I want to put in a separate drain for the dishwasher and not hook it up to the sink drain.

    I have perfectly easy access to a 2" drain line directly under the floor (lots of room under the floor as well) and easy access to the wall behind the dishwasher. No encumbrances whatsoever. I've done lots of remodel plumbing but I've never done a separate dishwasher drain.

    Does anyone have any info on installation and requirements of a separate drain for a dishwasher?

    Thanks very much for any advice.
    Mark Rios

    Anything worth taking seriously is worth making fun of.

    "All roads lead to a terrestrial planet finder telescope"

    We arrive at this moment...by the unswerving punctuality...of chance.

  2. #2
    Join Date
    Mar 2003
    Location
    San Francisco, CA
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    10,304
    Have you ever seen a standpipe? They're not uncommon for a washing machine. You can do the same for a dishwasher.

    Here's a link to the installation instructions for a Fisher Paykel dishwasher. Look at page 4, option 1. http://usa.fisherpaykel.com/admin/pd...nstall_USw.pdf

    Note that you must include the P-trap, to keep sewer gases from coming out into the room.

  3. #3
    didn't look too closely at the pervious attached, but pay particular attention to page 4. Using the 'sink drain' as you describe benefits from the P trap that keeps gases at bay. Failure to replicate this in some manner will really stink up the joint.

  4. #4
    Join Date
    Feb 2004
    Location
    Modesto, CA
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    That looks great thanks.

    So there seem to be no tricks really, just a straightforward drain (which would of course include p-trap). I'd probably tie a vent in as well. I just need to keep an air gap somehow right?

    Thanks very much again.
    Mark Rios

    Anything worth taking seriously is worth making fun of.

    "All roads lead to a terrestrial planet finder telescope"

    We arrive at this moment...by the unswerving punctuality...of chance.

  5. #5
    Join Date
    Mar 2003
    Location
    San Francisco, CA
    Posts
    10,304
    Quote Originally Posted by Mark Rios
    That looks great thanks.

    So there seem to be no tricks really, just a straightforward drain (which would of course include p-trap). I'd probably tie a vent in as well. I just need to keep an air gap somehow right?

    Thanks very much again.
    The top of the standpipe is open, and the hose from the dishwasher just drops into it. Often there's a J-shaped rigid tube on the end of the dishwasher hose to prevent the rubber hose from closing off as it tries to turn a sharp corner. (On the FisherPaykel installation page I cited, you can see a plastic thingy which helps the hose make the turn, but not collapse.) Air can enter the standpipe past the dishwasher hose, and that helps prevent the P-trap from siphoning empty. On the sewer side of the trap, the usual venting rules apply: you're supposed to have a vent pipe right where the drain goes inside the wall.

  6. #6
    Join Date
    May 2005
    Location
    Somerville, MA
    Posts
    152
    I built a temporary cabinet for my dishwasher out of a couple slabs of MCP and a piece of postform countertop. Drain is via a standpipe, as described, into the drain stack that's going to be for the sink and dishwasher when I get these cabinets finished. Works just fine.

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