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Valliant AquaPlus VUI 362-7 Help!

Discussion in 'Plumbing and Central Heating' started by ADurr, 3 Sep 2019.

  1. ianmcd

    ianmcd

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    Sorry I am totally confused with what you are saying so I will go through how your boiler works, cold feed is simply that the cold water goes into the plate heat exchanger and comes out of the tap hot, the water inside your radiators and inside the boiler is a sealed system and the pressure is measured by the pressure gauge on the front of the boiler, you top up this pressure and then close the valves and leave , the silver hose must be connected to fill the boiler and can be disconnected afterwards, the boiler has a Pressure relief valve that is set to operate if the pressure exceeds 3 Bar, this vents the water to outside to protect the boiler, you should not have any water coming out of the PRV outlet under normal working conditions
     
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  3. ADurr

    ADurr

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    ok understand.

    so following the steps you said before to test if the filling loop valves we’re passing the answer is? I assume the dribble every 7 seconds is due to the PRV?

    the issue that needed addressing in my original post was the constant water being dumped outside when the boiler was on, I assume this is now down to the PRV? So the PRV needs replacing?
     
  4. ADurr

    ADurr

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    @ianmcd

    maybe worth explaining my original symptoms better.

    with cold feed on, open filling loop and fill to green section roughly 1.5bar. Close filling loop.

    normal boiler operation, hot water, CH etc.

    water is trickling from the outside overflow constantly, and pressure on gauge rising into the red.

    I want to stop the water outside and stabilise the pressure.

    questions:

    1) are my symptoms all down to the PRV?
    2) are my filling loop valves OK after performing the tests you said? Ie they are not passing?
    3) what else should I check before getting the PRV replaced.

    thanks!
     
  5. ianmcd

    ianmcd

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    Possibly , but it is designed to operate at 3 Bar, you say your gauge is not registering any pressure , if it is blocked and you are putting more than 3 Bar in then the PRV is just doing its job
     
  6. ADurr

    ADurr

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    sorry double posted whilst you were responding. Not sure where to go now but maybe my new post will help explain...
     
  7. ianmcd

    ianmcd

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    Your expansion vessel needs recharging/replacing and probably a new PRV now too
     
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  8. ADurr

    ADurr

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    How can I recharge the vessel to check that before I buy replacement and also PRV?
     
  9. ADurr

    ADurr

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    How can I recharge the vessel to check that before I buy replacement and also PRV?
     
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  11. ianmcd

    ianmcd

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    Look at the FAQs there are hundreds of posts explaining how to do it, follow All the steps you can not cut corners it has to be done properly
     
  12. ADurr

    ADurr

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    Thanks @ianmcd

    found the faq.

    which is my best place to drain off the system as to get the right pressure in the vessel?
     

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  13. ianmcd

    ianmcd

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    Use this drain attach a hose into a bucket and open the drain valve, when water stops attach a pump to the EV and start pumping lots more water will come out, when the water stops coming out keep pumping till about 1 Bar pressure in EV, remove pump close drain and re-pressurise water side of your boiler.
     

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  14. ADurr

    ADurr

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    Thanks Ian.

    So I’ve drained the expansion vessel, must have been 8litres in there, repressurised to 1bar and filled the cold loop to 1.5bar on the control unit gauge. Boiler back on and ran the hot tap. Pressure looks stable so far holding in the green at 1.5bar.

    overflow pipe outside is still letting a little water - what else could now be causing this? The vessel is holding 1 bar, so I assume it’s only the PRV that maybe passing a little?

    thanks for your help.
     
  15. ianmcd

    ianmcd

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    yes with a flat expansion vessel the PRV can be cruded up, it is possible to clean them, I do it all the time but they are not expensive so maybe best if you get a new one
     
  16. ADurr

    ADurr

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    Awesome thanks I’ll sort a new one and replace it if that’ll be the culprit for the leaking overflow
     
  17. ADurr

    ADurr

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    is the procedure similar to drain the boiler like I did for the PV and then just replace the unit? Assume it’s just this I need?
     

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