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UFH.. Plumbing question

  • 24-10-2009 11:03am
    #1
    eugenedoc1
    Registered Users, Registered Users 2 Posts: 55 ✭✭


    Hi,Have 2 story house with underfloor heating installed through out.
    Just recently upstairs was getting colder so had a look at the manifold.
    Noticed when the stats called for heat, circ pump switched on but the flow gauges didnt move at all.
    I called the guys that installed the system and they told me to press the release button at side of the yellow box which was close to the circulation pump. i did this and when i turned the nipple to 12 o clock. the flow gauges all worked and the heating worked 100%. The plumbers came back when i was at work and replaced the "yellow box" with a new one. Now the system is doing the same bloody thing as before. If i leave the box off the system works fine but the circ pump is very hot. Any help please .


Comments

  • #2
    [Deleted User]
    Posts: 31,118 ✭✭✭✭ [Deleted User]


    eugenedoc1 wrote: »
    Hi,Have 2 story house with underfloor heating installed through out.
    Just recently upstairs was getting colder so had a look at the manifold.
    Noticed when the stats called for heat, circ pump switched on but the flow gauges didnt move at all.
    I called the guys that installed the system and they told me to press the release button at side of the yellow box which was close to the circulation pump. i did this and when i turned the nipple to 12 o clock. the flow gauges all worked and the heating worked 100%. The plumbers came back when i was at work and replaced the "yellow box" with a new one. Now the system is doing the same bloody thing as before. If i leave the box off the system works fine but the circ pump is very hot. Any help please .

    What "nipple" are you turning and when you say you take the yellow box off, what exactly do you mean - are you removing it off a valve or something.

    If the pump is running hot, there could be a restriction in the flow - may be caused by the removal of the yellow box which I'm guessing is a motorised valve actuator, without the actuator in place the valve may be half shut.

    Some pictures would be useful to give us a better idea.


  • #3
    eugenedoc1
    Registered Users, Registered Users 2 Posts: 55 ✭✭eugenedoc1


    Deleted User wrote: »
    What "nipple" are you turning and when you say you take the yellow box off, what exactly do you mean - are you removing it off a valve or something.

    If the pump is running hot, there could be a restriction in the flow - may be caused by the removal of the yellow box which I'm guessing is a motorised valve actuator, without the actuator in place the valve may be half shut.

    Some pictures would be useful to give us a better idea.

    Yeah dolan , Im guessing the yellow box has something to do with opening /closing the valve to let hot water to the circ pump. this is all new to me.The plumber told me to remove the box from the valve by pressing the release button. This showed a nipple which was at the closed position. when i turned this so it was straight up straight down the flow guages started showing pressure and the floors started to heat. They replaced the yellow box with another one which seems to be doing the same bloody thing.


  • #4
    [Deleted User]
    Posts: 31,118 ✭✭✭✭ [Deleted User]


    Looking at the pictures, the yellow box is a motorised valve actuator.

    That would be the main feed to the system it would switch all on or all off.

    Bypassing this valve (removing the actuator anf turning the valve manually) would mean that the UFH is on all the time the boiler is running.

    I think the valve is there to stop the UFH leaching heat from the boiler when heating is not required.

    I see that all the floor zone valves were calling for heat when the picture was taken, is there just the one manifold or is there another one for upstairs.

    Check that all the room stats are set to the correct temperature, it could be that one of the ground floor stats is set too high.

    Get the heating engineers to check the controls as well, the valve appears to be shutting off the water before the zone valves close off zones that have reached the correct temperature.


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