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How do I drain down system with these values

Discussion in 'Plumbing and Central Heating' started by benjiman, 16 Sep 2021.

  1. benjiman

    benjiman

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    Hi all,

    Got a combi boiler in a new build flat.

    Need to drain down the system, but cant find any drain off values which I can just attach a hose to and open up.

    Instead there are two radiators with this kind of drain off value. See pic. Not sure how to drain the system with these..is it possible?

    Is it a case of opening the square nut, let water **** out then quickly put a hose on it?
     

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  3. terryplumb

    terryplumb

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    Close down the rad valve ( turn fully clockwise )remove the square shaped thing,put hose on ,open rad valve.
     
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  4. benjiman

    benjiman

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    I did close down the rad value, but as started removing the square plug water started coming out with prettt decent force, so close up again. Is that normal and I just have to quickly get the hose onto it?

    Seems a bit of a silly design surely?
     
  5. terryplumb

    terryplumb

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    Put a bucket or pot under it ,and undo the square a little to allow water out ,the pressure will drop after a bit. You can then remove it fully and put a hose on.
     
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  6. benjiman

    benjiman

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    Thanks will do that. Worth changing it out to a normal drain off for future work?
     
  7. terryplumb

    terryplumb

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    Yes ,it's either a very poor design ,or your valve isn't fully closing. Either way I would get rid of it.
     
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  9. jeff the gasman

    jeff the gasman

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    If you open the bleed valve and release the pressure first it will be easy.
     
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  10. ianmcd

    ianmcd

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    I bet you say that to all the boys xxx
     
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  11. Jackrae

    Jackrae

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    Did you also close the valve at the other end of the radiator :mad:
     
  12. benjiman

    benjiman

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    That i did not! Other end has a trv. Would that have stemmed the flow?
     
  13. jeff the gasman

    jeff the gasman

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    Yes it would.
     
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