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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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    yep that should do it
     
  2. ADurr

    ADurr

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    now I’m confused there are two PRV. One ch and one dhw. Which one do I need based on fact it overflowing and there’s no ch demand switched on?!

    assume dhw is blue cap, ch grey cap
     
  3. ianmcd

    ianmcd

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    Grey cap
     
  4. ADurr

    ADurr

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    So the blue dhw wouldn’t be passing also? I’ll order and replace the grey
     
  5. ianmcd

    ianmcd

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    the blue one would have no affect on your boilers primary pressure in any way
     
  6. ADurr

    ADurr

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    Morning @ianmcd

    left boiler with cold feed on overnight and the pressure on the control unit gauge has risen out of the “green”. Is this all attributed to the PRV still or should I be looking at another valve to change same time as the PRV?

    PRV is on order
     
  7. ADurr

    ADurr

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    think I have the PRV today? Should I drain like you showed me other night?

    also my boiler has a small 1litre expansion vessel underneath the main one - does this need pressurising as well?
     
    Last edited: 4 Oct 2019
  8. ianmcd

    ianmcd

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    If you are changing the PRV you can just use the existing one to drain the boiler or use the drain point doesnt matter as long as whatever you use is left open as you pressurise the EV, the small ev will be for the cold water inlet you shoudnt need to touch it
     
  9. ADurr

    ADurr

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    Thanks @ianmcd

    with the pressure rising overnight after charging the EV, is that down to the PRV again or is there something else I need to be considering? Cold water pressure here is quite high so maybe I need to down mains pressure down?
     
  10. ianmcd

    ianmcd

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    if the pressure rises with the silver hose disconnected it will be your plate heat exchanger
     
  11. ADurr

    ADurr

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    Hi @ianmcd

    PRV arrived today and just fitted it. The vent pipe outside is still dribbling water when I’ve set everything.

    steps I followed : released system pressure, replaced PRV, leaving drain valve open repressurised the EV to 0.9bar. Closed drain valve.

    opened cold inlet main feed. Opened filling loop inlet, then opened return valve to bring system pressure to 1.2bar. Closed return filling loop valve then inlet filling valve.

    boiler on, hot water demand. Did get a fan error - is that cause the pipe work is empty for example? Any ideas do I need a procedure to get system going again?

    think I didn’t set it all right after drain, got a fault code “too much air in system” - ?!

    either way, still getting that venting dribble, take it only option is the heatx now?
     
    Last edited: 7 Oct 2019
  12. ADurr

    ADurr

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    Sorry for all the questions at once!

    strangely with the boiler off and the cold mains valve shut I still get some water coming when hot tap is on, but I can only assume that’s due to mixer taps, rather than something passing...

    appreciate all your help @ianmcd, hopefully I’m almost there to fixing it!
     
  13. ianmcd

    ianmcd

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    yes can only be the Plate Heat exchanger now
     
  14. ADurr

    ADurr

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    Thanks @ianmcd - would that be causing the dribble? So definitely no more valves or anything like the 10bar dhw valve?

    the PRV was pretty cruded up so glad I replaced.

    will get the heatx off and see if it can be cleaned or flushed if not will go new.

    the airlock - how should I clear that? Obviously I gotta drain again for the heatx but when I put it all back on wanna make sure it’s all done right
     
    Last edited: 8 Oct 2019
  15. ianmcd

    ianmcd

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    you will have to replace the Plate hex, it is pinholed and mains water is passing into the system water
     
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