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Zoned heating system heating - why are 2 zones heated when only 1 on?

  • 30-05-2013 8:29am
    #1
    munsterkerryfan
    Registered Users, Registered Users 2 Posts: 67 ✭✭


    Hi,

    I have a 3 zone oil burner heating system in my house. The 3 zones are water, upstairs and downstairs.

    Since the weather started getting warmer, I have turned off the upstairs and downstairs zones competely and I just heat the water for an hour in the morning and an hour in the evening.

    While the water is being heated, the radiators upstairs also heat up. Any one know why this is happening? The upstairs zone is definitely not on so I can't see why the rad's upstairs are heating up.


Comments

  • #2
    DGOBS
    Hosted Moderators Posts: 3,496 ✭✭✭DGOBS


    Most likely the motorised valve (usually in the hot press) that controls upstairs has jammed in the open position and will need replacing


  • #3
    Dtp79
    Closed Accounts Posts: 2,097 ✭✭✭Dtp79


    DGOBS wrote: »
    Most likely the motorised valve (usually in the hot press) that controls upstairs has jammed in the open position and will need replacing

    Yes quite possibly. Or maybe the 3 tee rule was ignored.
    OP, from the boiler pipes, you're cyclinder tees should be first, then your heating zones. Is this the case?


  • #4
    munsterkerryfan
    Registered Users, Registered Users 2 Posts: 67 ✭✭munsterkerryfan


    Will check for both those issues this evening - thanks.

    Only installed this heating system 3 months ago so didn't expect any problems so soon.


  • #5
    shane0007
    Closed Accounts Posts: 4,677 ✭✭✭shane0007


    Also check if the light on the upstairs MV is on even though the timeclock is off for that zone. Often when wired incorrectly, it can back feed from the HW valve to the other MV.
    A common mistake without electricians.


  • #6
    esox28
    Registered Users, Registered Users 2 Posts: 800 ✭✭✭esox28


    Dtp79 wrote: »
    Yes quite possibly. Or maybe the 3 tee rule was ignored.
    OP, from the boiler pipes, you're cyclinder tees should be first, then your heating zones. Is this the case?

    Three tee rule what's that dtp?


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  • #7
    shane0007
    Closed Accounts Posts: 4,677 ✭✭✭shane0007


    To avoid reverse circulation.


  • #8
    esox28
    Registered Users, Registered Users 2 Posts: 800 ✭✭✭esox28


    shane0007 wrote: »
    To avoid reverse circulation.


    Ok reversing the flow through the rads, but in what configuration does tee need to be in order for this to happen.

    It would only happen if all returns are connected together and zv's on flows....?


  • #9
    DGOBS
    Hosted Moderators Posts: 3,496 ✭✭✭DGOBS


    with it, normally only the first rad or two would usually heat


  • #10
    Dtp79
    Closed Accounts Posts: 2,097 ✭✭✭Dtp79


    esox28 wrote: »
    Ok reversing the flow through the rads, but in what configuration does tee need to be in order for this to happen.

    It would only happen if all returns are connected together and zv's on flows....?

    No. Basically your cylinder T first, followed by your first zone, then the next and so on


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