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Dishwasher not next to the sink

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  • #16
    Re: Dishwasher not next to the sink

    If the drain plugs, it is better off run to the disposal; then you have a double sink's worth of storage. When they are run to a separate trap under the sink cabinet is when I see the flood.

    And, c'mon, hot water in a disposal makes a problem? It may well say not to do it but if it really hurt anything we'd all be replacing so many disposals there'd be no time to do anything else.
    This is my reminder to myself that no good will ever come from discussing politics or religion with anyone, ever.

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    • #17
      Re: Dishwasher not next to the sink

      not sure about everyones opinion, but having installed several thousand dishwashers in new construction with commercial plumbing inspectors. the inspectors for the most part only allowed the distance that the factory hose could reach.

      in the old days, d.w. didn't come with the hose so they would allow a developed length of 6' to the air gap.

      there were times that we did have to drill an air gap into counter top. the discharge line 7/8'' still had to be graded to the disposal.

      now in the really old days, the dishwashers typically had their own trap stubbing up into the bottom of the dishwasher compartment.

      if it's not going to be inspected, then i would say you can run a line to the air gap. inside the cabinets rubber is fine. under the house use copper.

      too much distance will cause standing water in the dishwasher as the pump shuts off, the water will come back to the dishwasher. a simple check valve installed accessible outside the dishwasher compartment will cure this.

      if you need to install a separate trap, remember that you still need an air gap with 90% of the machines and an air gap not installed in a sink is a flood waiting to happen. a high loop is not legal here.

      rick.
      phoebe it is

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      • #18
        Re: Dishwasher not next to the sink

        Originally posted by Plumber Rick
        the inspectors for the most part only allowed the distance that the factory hose could reach.
        Good grief! What code were they citing for that?

        too much distance will cause standing water in the dishwasher as the pump shuts off, the water will come back to the dishwasher.
        Water seeks its own level. The only part that can come back is what's in the vertical part of the pipe. What's in the horizontal won't make any difference. The amount of water with the pipe running beneath the floor will be exactly the same as if it were right next to the sink and piped in the cabinet since the level of the bottom of the dishwasher remains the same.

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        • #19
          Re: Dishwasher not next to the sink

          Originally posted by Herk View Post
          Good grief! What code were they citing for that?

          look at section 301.1.1 approvals the manufactures third party certified/ listed research report.


          section 807.4 air gaps


          section 404.4 wye branch tail pieces.



          Water seeks its own level. The only part that can come back is what's in the vertical part of the pipe. What's in the horizontal won't make any difference. The amount of water with the pipe running beneath the floor will be exactly the same as if it were right next to the sink and piped in the cabinet since the level of the bottom of the dishwasher remains the same.
          this is true. until you take into affect the laws of physics and siphon-age.


          what it boils down to is the what the manufactures approved specs are.

          i just got off the phone with the plumbing inspector who answers the phone for code questions. we both agreed that the manufactures specs are the ones to go by. although he did bring out his old school #'s of 30'' horizontal plus the 36'' to air gap.

          the specs of each manufacturer will be the deciding factor if in doubt.

          sort of the same mentality of a plastic hose bibb on a water heater drain. approved as a unit, not independently.

          rick.
          phoebe it is

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          • #20
            Re: Dishwasher not next to the sink

            Anyone remember built into the wall air gaps?

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            • #21
              Re: Dishwasher not next to the sink

              In Ohio we usually run the lines through the cabinets or the floor whichever is easiest plus we are not required to add the air gap on the discharge line the high loop under the sink is Ok with the inspectors here .

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              • #22
                Re: Dishwasher not next to the sink

                Originally posted by Killertoiletspider View Post
                Hot water should never be used in a garbage disposal, it even tells you that in the owners manual.
                Then you have to wonder why GD's come with a dishwasher tee attachment.

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