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Venting air in UFH system, causes, etc

  • 14-05-2012 11:33am
    #1
    ifconfig
    Registered Users, Registered Users 2 Posts: 880 ✭✭✭


    I have 2 lads around this morning to vent the UFH system which was installed in our house around Summer/Autumn 2007.
    We had air accumulate in the UFH heating loops (you could hear the churning/agitated flow in the closet where the water is pumped/circulated from utility to downstairs/upstairs) for several weeks now.

    One of the valves in the hot press upstairs was breached about 3-4 weeks ago and they repaired that (the cap was missing off the valve).
    At that time they were busy and couldn't stay to vent the entire system.
    Instead they simply did a water refill from the mains and repressurised the flow from garage to house but didn't vent the UFH loops.

    I think todays work is a 2-3hr job as I think they need to empty and refill and they've pipes going into the bath to bleed out the existing water in the closed system.

    My question is this ...
    Why has this occurred ?
    Someone told me that really the system was probably never properly fully vented after installation.
    If that's the case wouldn't this be a case that the system was not properly commissioned in the first place ?

    I will pay for the work but I'm trying to establish if I've any case for discounts based on the original work not being up to spec ?

    —ifc


Comments

  • #2
    aujopimur
    Registered Users, Registered Users 2 Posts: 3,953 ✭✭✭aujopimur


    I've never heard of needing to drain large amounts of water in order to vent air from a sealed system.
    A few auto air vents or air bottles correctly installed should be able to vent any system.
    Don't forget to add inhibitor.


  • #3
    JohnnieK
    Registered Users, Registered Users 2 Posts: 2,526 ✭✭✭JohnnieK


    Each circuit on the underfloor needs to be filled and purged on commissioning. If this was just a recent turn of events then something must have contributed to the air. If it was not purged properly on commissioning you would have heard this from day one, air in a system is very noisy.

    It's possible when they fixed the leaky valve air was introduced but the auto air vent should have been able to cope with that. To be honest if they didn't vent it when they where there and are coming back to do, it I wouldn't be paying them for the return visit.
    They should have done it when they were there.

    Did they say you would be charged for the return visit to vent?


  • #4
    heinbloed
    Registered Users, Registered Users 2 Posts: 1,632 ✭✭✭heinbloed


    I have 2 lads around this morning to vent the UFH system which was installed in our house around Summer/Autumn 2007.

    The system might have vented itself all the time until the pressure dropped below the minimum. Hence the gurgeling noise since a few weeks - after years of neglect.

    Every CH system must be serviced once per year. The entire CH system - not only the boiler.

    For the lazy installers and the forgetfull operators there are automatic vacuum ventilation methods available:

    http://www.reflex.de/fileadmin/user_upload/pdf_en/PI1128en_9571284_servitec_30.pdf

    from

    http://www.reflex.de/index.php?id=5&L=1


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