hammer arrester

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by jetlag, Aug 25, 2010.

  1. jetlag

    jetlag New Member

    Messages:
    84
    Location:
    Ga.
    I have installed a hammer arrester supply box for the ice maker on frig the dish washer will be right beside the frig . can i put a tee in the ice maker line for the dish wash or does the code require a seperate supply box for the dish wash. The ice line is 1/4 od isnt the dish wash larger 3/8 od.
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,059
    Location:
    New England
    To provide the best performance, the arrester should be near the valve that is closing.
  3. jetlag

    jetlag New Member

    Messages:
    84
    Location:
    Ga.
    It will be near . the frig and dish wash are side by side, my question was can u run both from the same supply box
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,059
    Location:
    New England
    one uses hot, the other cold. not sure what you're planning.
  5. Terry

    Terry Administrator Staff Member

    Messages:
    15,053
    Location:
    Bothell, Washington
    Cold for the ice maker and hot for the dishwasher.

    Also, the icemaker connection is 1/4" and the dishwasher is 3/8"
    Different pipes, cold and hot, and different sizes.

    A dish washer should always be plumbed to the hot side.
  6. jetlag

    jetlag New Member

    Messages:
    84
    Location:
    Ga.
    Wow I feal really dumb I have connected several dish wash and used the hot side , Dont know what I was thinking. But I just Tapped into the hot supply under the sink . Do you have to install an arrester supply box behind the dish wash now ?
  7. Terry

    Terry Administrator Staff Member

    Messages:
    15,053
    Location:
    Bothell, Washington
    "Wow I feal really dumb I have connected several dish wash and used the hot side"

    You do use the hot side for a dishwasher.
  8. jetlag

    jetlag New Member

    Messages:
    84
    Location:
    Ga.
    I know you use the hot I meant I feel dumb asking if I could use the ice maker line. do yo install a hammer arester box for the dish wash now or just tie in the hot under the sink
  9. Terry

    Terry Administrator Staff Member

    Messages:
    15,053
    Location:
    Bothell, Washington
    Every quick closing valve needs a water hammer device, if the system is closed.
    Icemaker cold
    dishwasher hot
    Clotheswasher hot and cold

    [​IMG]
    Last edited: Jan 1, 2011
  10. jetlag

    jetlag New Member

    Messages:
    84
    Location:
    Ga.
    Thanks I allready have the washer and ice maker boxes in, I notice they sell some hammer devices seperately , Can you just install that in the line the dish wash connects to or do you need the made up box that mounts in wall with cut off and arrester installed to connect dish washer
  11. Terry

    Terry Administrator Staff Member

    Messages:
    15,053
    Location:
    Bothell, Washington
    If the hammer arrestor is within six feet it works. The closer the better though.
  12. benze

    benze New Member

    Messages:
    63
    Location:
    Montreal, Canada
    Actually, not always true. Some of the higher end dishwasher makes/models (esp European models - ex: Miele) recommend connecting to the Cold Water supply as it has its own internal heating element for the water, and by connecting it to cold water, the dishwasher is able to more accurately control the exact temp of the water being used.

    In fact, to my knowledge, most European models are plumbed to the cold supply.

    Eric
  13. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,059
    Location:
    New England
    Most washing machines there also have their own heater...unless you heat your water with electricity, you'll save money and have much shorter cycles if you feed it hot. Tankless point of use heaters are much more common in Europe, so to avoid getting lousy flow at the kitchen sink, running cold to the dishwasher is more common. It also minimizes the number of heating units you need. The heating elements in them work off a thermostat, and will only run long enough to raise the water temperature to where it needs to be by design, so if you start with warmer water, it won't matter, it just runs less, and gets to the job of washing the dishes faster.
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