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Discuss Advise please on shower mixer in the Valves & Taps area at UKPlumbersForums.co.uk.

  1. Tom Barry

    Tom Barry New Member

    Hi Last year I replaced a Thermostatic bar shower mixer valve in a rented property and all seemed ok ,but recently the owner said it wasn't working properly .When you turn on the valve nothing happens but if you turn on the bath tap briefly, it works fine ., they also made it work by twisting temperature valve which was not in the default position & seems to be their go to method ,but it didn't work when I tried it.The shower is fed by a pump and feeds another shower on-suite which has no problems, but the pump does not come on if the bath is used. On inspection the filters were clear and when installed again it worked as it should, but the next day people had used and it was not working properly again .Could it be the original installer did not put non return valves on the feeds
    Thanks for any advise :)
     
  2. Dkdc71

    Dkdc71 Member

    Recheck the pipework runs if you can sounds like when the bath is turned on with the shower valve the fluctuation is activating the float switch in the pump ,should be independent supplies but if it was retrofitted it might have always been wrong from day one hope that helps Tom
     
  3. Best

    Best Trusted Plumber

    What head of water (cold tank) is on the shower head?
    Are the pipe runs done up and over?
    Is the pump positive or negative head?
    Did you also check the filters that are inside the pump inlets (or some have inlet washer filters) ?
    Also are the float switches clean and freely moving?
     
  4. Tom Barry

    Tom Barry New Member

    Thanks, I think your right about that -I'll check it tomorrow cheers
     
  5. Tom Barry

    Tom Barry New Member

    Thanks I'll check it tomorrow
     
  6. Tom Barry

    Tom Barry New Member

    Ok sorry for delay
    so its positive head system
    Cold gravity fed 2.5 metres from bottom of tank to hot tank
    pipe runs underfloor same level
    Pump filters had very little limescale but mesh was clear
    looks like all other taps on this floor are on same pump
    as to the float switches, I didn't take them out incase it broke -looked clear -
    Salamander pump Right RSP 75
    static head Max 10 metres
    Max liquid temp 65c
    Duty Lpm 2.15 bar max 2.2bar
    2010 installed
    hazels house.jpg
    flanged on top tank
    IMG_1645.JPG
    Water tank and pump.jpg
    IMG_1630.JPG

    Just before I turned on the electric to pump I run the shower and it worked although weak -but went back to delayed action with power on and requiring tap or other shower to work again
     
  7. Best

    Best Trusted Plumber

    It should work with that pipework, but the head of water for shower is actually the distance from the base of cold tank to the shower head (outlet).
    Nice diagrams!
     
    • Like Like x 1
  8. Matchless.plumb

    Matchless.plumb Trusted Plumber GSR

    I like the filling loop :)
     
    • Funny Funny x 1
  9. 64degrees

    64degrees GSR

    Cold feed is activating the pump, not enough head from hot supply, needs a negative head pump
     
  10. Tom Barry

    Tom Barry New Member

    Thanks any ideas where to get one ?


    Ah right, dohhh :oops:
    cheers
     
  11. Best

    Best Trusted Plumber

    Negative head pumps can be quite expensive. I prefer the Stuart and Turner pumps - Monsoon range.
    Screwfix sell them.
     
  12. Tom Barry

    Tom Barry New Member

    Neg pump kit.PNG Is this the answer or a complete pump?
     
  13. Best

    Best Trusted Plumber

    No, if you had to replace your existing pump you would need a twin pump similar looking to what you have at present. You can get them in negative head which have a small expansion vessel on them. I actually think your pump should work as the head of water to both cold and hot is what starts your existing. If you have a shower handset attached to a shower hose (not fixed) and lower the handset every time you want the shower pump to start, you might find it works.
    Otherwise a negative head pump is the answer and will always start as there is a pressure charge in the outlet pipes with it.
    The Monsoon negative head is about £400 for 2 bar and just under £500 for 3bar from Screwfix but it is superb. I would go 3bar.
    It is on internet for as little as circa £430 if you look
     
    • Agree Agree x 1
  14. Tom Barry

    Tom Barry New Member

    Thanks will talk to owner when back from holiday
    cheers
     
  15. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    also wheres your s flange?
     
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