Installing Moen single handle Posi-Temp setup

Discussion in 'Shower & Bathtub Forum & Blog' started by Nate R, Jan 6, 2008.

  1. Nate R

    Nate R New Member

    Messages:
    472
    Location:
    Milwaukee, WI
    I have a Single handle Monticello tub/shower faucet. Trying to figure out Moen's drawing for the setup.


    At the top of the drawing there is: "1/2" min CC; 5/8" min IPS"

    I would think IPS is Iron Pipe Size. But that doesn't make sense as the valve is set up for 1/2" pipe, and there's the same inidication at the upper left for 1 7/8" and 2".

    What does the CC and IPS mean? I can't find anything explaining the terms.

    And am I understanding it correctly: I read it as I can have the centerline of the valve a max of 2 1/2" back from the finished wall surface. Am I interpreting the diagram correctly?

    What do I use for the actual tub faucet pipe? Elsewhere, it's specified that a 1/2" threaded pipe should stick out 4 1/16" from the finished wall for the spout. Can I use copper and solder a threaded fitting at the end, or should I use galvanized for this?
    Last edited by a moderator: Nov 17, 2012
  2. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Darn you're easy! CC is copper and yes to answer every question!
    You pass the instruction reading test now hows your sweating ability?
  3. Nate R

    Nate R New Member

    Messages:
    472
    Location:
    Milwaukee, WI
    Wow. Makes me feel a bit dumb.

    Dunno, the diagram isn't as clear as it could be.

    I thought it might be copper, but I had never seen it indicated that way before.

    Sweating? Well, the only other copper pipe sweating project I did went fine first time around. 14 joints w/ no leaks, so I think I'll be OK. Done lots of electronics soldering, and some of the same principles apply, so hopefully I wasn't just lucky with the first go round.
  4. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    First project 14 joints no leaks... Impressive!
    Good luck with this one hope your streak continues!
    Are you replacing an existing valve or, is this a new installation?
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,316
    Location:
    New England
    Do NOT use galvanized nipple for your tub spout; either use copper and solder on a fitting or use a brass nipple. Note, some tub spouts don't need a fitting, they slide on and then you use the set screw to hold it in place. The galvanized will eventually start to rust, and I'm sure rust stains are not part of the look you are going after.

    Also, instead of a threaded fitting in the wall, many of the valves will accept insertion of the copper pipe directly inside the valve and then solder it in place. This produces a better solution if you are comfortable with the higher mass of the brass valve. Take the cartridge out while soldering to be safe.
  6. Nate R

    Nate R New Member

    Messages:
    472
    Location:
    Milwaukee, WI
    This is a new install. Old tub was in the NE corner of the bathroom, which didn't have enough ceiling height for a shower, as the North roofline cuts into the headroom there. New tub will be in the SE corner. So I've still got the old tub in place and am doing as much as I can first. Only one bathroom in the house, so we're trying to work around the old tub until we have no choice. So I have one of the new alcove walls framed. The other wall will have to wait. But I'm going to get the supply plumbing done next, and then probably rough in the DWV.

    This spout is not slip fit, so I'm stuck threading it on. I will look into whether my valve will accept direct soldering. I'd prefer that. But that's another thing I didn't know when I bought it almost a year ago.

    Thanks for the help! I'll probably post pics as I continue and ask for feedback.
  7. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Sorry I missed the galv nipple that one is a no!

    The moen spout will go onto a male adapter sweated on a copper pipe stub just fine! just set the lenght of the stub out correctly.
  8. crosby1

    crosby1 New Member

    Messages:
    28
    Location:
    Virginia
    Another question regarding this diagram: between the spout and the valve there is a measurement of 1-11/16". WHAT is 1-11/16"???

    is it the distance between the finished wall surface and the center of the valve? according to the previous post, this distance was 2-1/2"?!?!?!?

    why can't they make these things so normal people can read them????
  9. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,251
    Location:
    Cave Creek, Arizona
    valve

    It's a good thing we don't read the instructions before we install those valves or it would never get done. That dimension is an engineer's idea of the ideal dimension to the face of the the drop pipe. It has no meaning in the real world, just as few of the other dimensions are as exact as they imply.
  10. Terry

    Terry Administrator Staff Member

    Messages:
    15,416
    Location:
    Bothell, Washington
    Here is a Moen video on installation

    [video=youtube;9-O2bfxka8A]http://www.youtube.com/watch?v=9-O2bfxka8A&list=PL4F22F469D14B207E&index=6&feature= plpp_video[/video]
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