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

Mid-Position Valve

Discussion in 'Plumbing and Central Heating' started by jbmc, 21 Dec 2015.

  1. jbmc

    jbmc

    Joined:
    21 Dec 2015
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Is it normal for the orange wire of the mid position valve to temporarily cease being live when the valve is switching from the mid-position (heating + h/w) to the heating only position? This causes the boiler to momentarily turn off.
     
  2. HootingOwl

    HootingOwl

    Joined:
    19 Jun 2008
    Messages:
    4,262
    Thanks Received:
    1,348
    Location:
    Bristol
    Country:
    United Kingdom
    What is the make of the 3 port?
     
  3. Sponsored Links
  4. jbmc

    jbmc

    Joined:
    21 Dec 2015
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    It's the Honeywell V4073A.
     
  5. stem

    stem

    Joined:
    20 Jul 2005
    Messages:
    6,800
    Thanks Received:
    1,617
    Location:
    Nottinghamshire
    Country:
    United Kingdom
    Perfectly normal. In the hot water only, or hot water and heating positions, the boiler is controlled by the thermostat on the hot water cylinder. When the hot water is up to the correct temperature, the cylinder thermostat turns off the boiler. At this point, if the central heating is still required, the valve's motor will start to wind over to the heating only position. In doing so, it operates a microswitch which energises the orange wire to take over the boiler control.

    The small delay in the valve moving from central position, to the heating only position and triggering the microswitch causes the 'blip' you describe.
     
    Last edited: 21 Dec 2015
  6. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
  7. Sponsored Links
Loading...

Share This Page