1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Motorised zone valve mounted the wrong way round

Discussion in 'Plumbing and Central Heating' started by jtboldon, 15 Nov 2016.

  1. jtboldon

    jtboldon

    Joined:
    15 Nov 2016
    Messages:
    14
    Thanks Received:
    0
    Country:
    United Kingdom
    I have Drayton ZA5 zone valves for hot water and central heating in the house that we have just moved to. Things are not right because the boiler is cycling every minute. Measuring flow and return temperatures indicates that the problem is insufficent flow through the system. The plumber who came out changed the pump which did not fix it. However, he did notice that the zone valves were mounted the wrong way round with flow B to A. He was not very concerned and said it might be something to be addressed the next time the system is drained.
    Now since the problem is not fixed I started thinking about the zone valves being the wrong way round. If I examine a Drayton valve body (I have a spare), I can see that the valve is a gate valve. Surely mounted the wrong way the water flow will be pushing the valve closed and restricting the flow. This can't be good for the motor either. Does anyone have any experience what happens if these zone valves are mounted the wrong way round? Could this be the reason for my poor flow? Thanks for any feedback
     
  2. Sponsored Links
  3. Hugh Jaleak

    Hugh Jaleak

    Joined:
    3 Feb 2008
    Messages:
    7,376
    Thanks Received:
    1,734
    Location:
    Northamptonshire
    Country:
    United Kingdom
    They have a direction of flow for a reason. I suspect he may not have been 'too concerned' as he'd just fitted a new pump that you may not have needed.... Is the situation any better with the new pump?

    Regardless the valves need turning to be in the correct direction, if indeed they are wrong.
     
  4. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    23,374
    Thanks Received:
    9,624
    Location:
    Lanarkshire
    Country:
    United Kingdom
    your zone valves are not gate valves
     
  5. Agile

    Agile

    Joined:
    26 Jun 2004
    Messages:
    64,017
    Thanks Received:
    4,591
    Location:
    London
    Country:
    United Kingdom
    Why did you apparently pay for a pump which was not needed?
     
  6. Hugh Jaleak

    Hugh Jaleak

    Joined:
    3 Feb 2008
    Messages:
    7,376
    Thanks Received:
    1,734
    Location:
    Northamptonshire
    Country:
    United Kingdom
    Because I suspect the OP engaged a 'Heating engineer' to fix his system, so trusted the guy to do this. Having perhaps wrongly diagnosed the pump, the guy then felt he had to mention the valves as changing the pump probably hasn't achieved anything other than lightening the OP's wallet.
     
    • Like Like x 1
  7. oilboffin

    oilboffin

    Joined:
    26 Apr 2011
    Messages:
    1,665
    Thanks Received:
    247
    Location:
    isle of Lewis
    Country:
    United Kingdom
    How does anyone with any brains put a valve on the wrong way round unbelievable I suspect the
    plumber left it cos he knew he'd get called back.The trick is don't have him back get a proper plumber in to swop the valve round,this will proberly sort out the problem.Bob.
     
    • Like Like x 1
  8. Echo the husky

    Echo the husky

    Joined:
    25 Mar 2011
    Messages:
    2,476
    Thanks Received:
    326
    Location:
    Devon
    Country:
    United Kingdom
    I was somewhere the other day where the plumber had fitted a gas sub meter the wrong way around, it was making a lot of noise!
     
  9. Steelmasons

    Steelmasons

    Joined:
    10 Oct 2011
    Messages:
    16,396
    Thanks Received:
    3,969
    Country:
    United Kingdom
    Fitting incorrectly then they usually 'thud' when closing , dependant on circulator head then longevity will be short lived.
     
    • Like Like x 1
  10. Sponsored Links
  11. vulcancontinental

    vulcancontinental

    Joined:
    26 Jun 2010
    Messages:
    10,879
    Thanks Received:
    4,285
    Location:
    Bedfordshire
    Country:
    United Kingdom
    Subbing for Harp Heating 35 years ago they actually asked for the Tower 2 port valves to be fitted the wrong way round on the drawings.
     
    • Like Like x 1
  12. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    23,374
    Thanks Received:
    9,624
    Location:
    Lanarkshire
    Country:
    United Kingdom
    As Steel says the only problem I have seen when fitted in reverse is noise when closing
     
  13. FurstyFerret

    FurstyFerret

    Joined:
    13 Jun 2013
    Messages:
    33
    Thanks Received:
    0
    Location:
    Buckinghamshire
    Country:
    United Kingdom
    Is it possible the pump is (has always been?) the wrong way round?
     
    • Like Like x 1
  14. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    23,374
    Thanks Received:
    9,624
    Location:
    Lanarkshire
    Country:
    United Kingdom
    was there a reason for this dave ?
     
    • Like Like x 1
  15. jtboldon

    jtboldon

    Joined:
    15 Nov 2016
    Messages:
    14
    Thanks Received:
    0
    Country:
    United Kingdom
    Thanks for all the comments, and the answers as to what happens when the valves are the wrong way round. To be honest I am losing confidence in my plumber. When he tells me the zone valves are the wrong way round then I have no reason to doubt him. However, in taking a closer look myself I find that the zone valves are mounted the correct way round!! So how can he get this wrong? A layman might wonder why, if the flow is from right to left, is it marked A - B on the grey plastic actuator housing. But a real plumber knows the A to B direction of flow is marked on the bottom of the brass valve.
    Anyway that doesn't solve the problem of why my boiler is short cycling.
     
  16. DP

    DP

    Joined:
    10 Dec 2003
    Messages:
    14,786
    Thanks Received:
    3,251
    Location:
    Glasgow
    Country:
    United Kingdom
    What boiler do you have and is the motorised valve the only one fitted? Do you have a cylinder? Is there a motorised valve on the cylinder circuit? What happens if you only run CH ( HW is off)? Check the pipes to the cylinder with CH zone running. Check the flow and return pipes under the boiler
     
  17. jtboldon

    jtboldon

    Joined:
    15 Nov 2016
    Messages:
    14
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi DP, thanks for your interest. Since my problem turns out not to be the zone valves I have made another post entitled "short cycling rayburn boiler" and put the details answering your questions there.
     
Loading...

Share This Page