size of the center hole for a symmons shower valve?

Discussion in 'Plumbing Forum' started by LMHmedchem, Sep 11, 2019.

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  1. Sep 11, 2019 #1

    LMHmedchem

    LMHmedchem

    LMHmedchem

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    Hello,

    I need to convert an old 3-valve shower setup to a symmons single value. I know that you usually add a decorative plate to cover the unused holes in the tile from the old hot and cold water knobs. I need to know how large the existing center hole needs enlarged to accommodate the new symmons value. The wall is wire lath and plaster covered with ceramic tile.

    I have access from behind the wall to be able to get to all of the pipes without having to go through the tile but I don't know if the existing center hole needs to be enlarged or not.

    On page 2 of this diagram,

    https://www.symmons.com/wp-content/uploads/2017/08/3530B_3531B_3532B_ZV3174.pdf

    the wall cutout hole size is listed as 3-1/2" to 4". Is this the correct dimension? I am not sure exactly which model symmons will be used but my recollection is that the back side is more or less the same for all of them.

    Information would be appreciated,

    Thanks,

    LMHmedchem
     
  2. Sep 11, 2019 #2

    Snoonyb

    Snoonyb

    Snoonyb

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    You purchase the faucet, and in the package will be plastic plate used for the rough-in. That is the size that the cutout needs to be, and it is cut out of the finished side, not the back-side.
     
    LMHmedchem and zannej like this.
  3. Sep 21, 2019 #3

    LMHmedchem

    LMHmedchem

    LMHmedchem

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    Thanks for the info.

    I have everything installed and working, but the diverter does not seem to be functioning correctly. There is a very heavy flow of water from the spigot into the tub when the shower is on. I think that there is supposed to be a small amount of water that still flows from the spigot, but this looks almost like it does before I turn the diverter.

    Is there some adjustment that I missed?

    LMHmedchem
     
  4. Sep 22, 2019 #4

    Snoonyb

    Snoonyb

    Snoonyb

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    Both tub spouts have the diverter control, just lift and the water should be directed to the shower head. If there is difficulty in lifting try lowering the supply pressure/volume.
     
  5. Sep 22, 2019 #5

    LMHmedchem

    LMHmedchem

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    This is a symmons origins temptrol where the diverter is incorporated into the temperature control valve. The spigot does not have a diverter control. The diverter lever moves freely, but the flow of water from the spigot is only slightly reduced when the shower is on.

    LMHmedchem
     
  6. Sep 23, 2019 #6

    Snoonyb

    Snoonyb

    Snoonyb

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    I see, the response was in reference to the link in post #1.

    I would call their cust. service, because it is not addressed in the link.
     

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