Isar mystery water loss

Discussion in 'Plumbers' Talk' started by Northwest gas svc's, Mar 2, 2009.

  1. Northwest gas svc's

    Northwest gas svc's New Member

    Isar pressure gauge shows 1 bar constantly (hot or cold).
    Heating on and as it gets warm PRV lets water out, drips at first building up to a small trickle.
    The gauge continues to show 1 bar.
    Filling link disconnected.
    I know what I suspect but before I put ideas in any ones head I'll let you all loose on this strange phenomenon
     
  2. bettyswallocks

    bettyswallocks New Member

    dhw heat exchanger passing into the central heating side?
     
  3. billneely

    billneely New Member

    Hmm is the guage reading correctly. i had the same fault on a ferrolli optima took me a few goes then to find the guage was knackered .Or possibly just a faulty prv
     
  4. Kardon81

    Kardon81 New Member

    Water pressure switch blocked.
     
  5. Northwest gas svc's

    Northwest gas svc's New Member

    I am pretty sure the domestic ht xch is knackered but the gauge only showing 1 !! it must also be goosed possible stuck on 1 , I did drain a bit of water out to check if it dropped a bit , which it did, but filling the system after wouldnt take it higher than 1 .
    I hate isars, cant even get my fingers to the PRV , god knows how you change it, as for the domestic heat exch .
    This'll teach them to get warmfront in.
     
  6. billneely

    billneely New Member

  7. billneely

    billneely New Member

    if the guage wont go by 1 id put money on the vessell being flat in the isar.let us know plz
     
  8. bettyswallocks

    bettyswallocks New Member

    maybe the incoming pressure is only 1 bar
     
  9. Northwest gas svc's

    Northwest gas svc's New Member

    If the vessall was flat the system would heat up , blow off through the prv ,cool down and have a shortage of water, this is litterally running water out the prv, so it has to be mains filling through the domestic ht ex as it gets warm.
    What i cant get is the gauge showing 1 and the prv opening , it has to be a false reading or the prv is opening at 1
     
  10. billneely

    billneely New Member

    that wouldnt allow the prv to open .somethings taking the pressure up in the boiler / vessel flat or cracked wtr to wtr exchanger
     
  11. billneely

    billneely New Member

    its a good one m8 will be good to find out the reason !
     
  12. Northwest gas svc's

    Northwest gas svc's New Member

    yeah I'd probably agrre with that or the gauge is giving false readings and confusing the matter
     
  13. Northwest gas svc's

    Northwest gas svc's New Member

    This customer had a perfectly good 28cdi that Id fitted and then she had warmfront fit this for her behind my back and now Ive got involved in repairing it.
    She going to pay . ha ha
     
  14. Kardon81

    Kardon81 New Member

    Two things first you said in first post it gets worse when heating is on so Bill is correct your clearly got a problem due to expansion one way or another. Also PRV's a cheap i only takes them to open a few times under system pressure and the spring loses its like and the either never seat properly or pass at a lower pressure than the intended 3Bar.
    As for calorifier, isolate cold feed to boiler and run heating if problem still occurs you can rule out calorifier passing as theres not cold feed into it now.
     
  15. Kardon81

    Kardon81 New Member

    Sorry that last post is a bit todler talk isn't it, thats what you get for speed typing!
     
  16. Kardon81

    Kardon81 New Member

    Just a thought Richard Puller may know the answer to this problem, any ideas old swine?!
     
  17. Northwest gas svc's

    Northwest gas svc's New Member

    Its not the exp vessel cause the damn thing runs like a tap and yes if you turn the cold off to the boiler it does stop eventually. The mystery was the 1 bar thing
     
  18. Kardon81

    Kardon81 New Member

    Thnk your probably right then mate faulty gauge. If its any help think the PRV's on the isar are quite easy to change there push fit O ring type secured by a clip. Back right of boiler take bottom panel off should be able to get to it.
    Totally agree though piece of **** boiler, strange thing is sure Warmfront used to fit Vailiant not so long ago, don't know why the swapped not like ideal are cheap to buy?
     
  19. ripitout

    ripitout New Member

    you could try connecting a separate gauge on the heating side of the filling loop,just to confirm the accuracy of the internal gauge.
     
  20. Northwest gas svc's

    Northwest gas svc's New Member

    Yes thanks ripitout, think I'll do that just to confirm whats going on
     

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