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Vented central heating, air locks after drain down

Discussion in 'Plumbing and Central Heating' started by Mike_Guthrie, 13 Nov 2016.

  1. Mike_Guthrie

    Mike_Guthrie

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    Afternoon.

    I have a vented centra heating system with f&e tank in the loft

    I needed to swap a radiator and replace a few trvs as they were painted by the last house owner :(

    I drained the system down and flushed with clean water from the f&e tank. After about an hour I closed the drain point and filled the system back up adding in some inhibitor

    I drained all the bottom radiators first and then moved up stairs. Waiting for each radiator to stop hissing and for some water to come out.

    I then ran they system back up to temp and shut off the boiler. Then went around and bleed the radiators again. I done the bottom Ones first (only one needed done) then moved up stairs.

    All radiators up stairs bleed.

    However I still getting some air locks in the system. Is there a way to get rid of these easily. I have bleed the radiators again today and only got a tiny bit of air from one radiator.

    Symptoms and noisy water like sounds in some radiators and when you switch on the boiler and heating you hear a rush of water from
    The pipes heading to the boiler.

    Heating system and water all works fine apart from this.

    Any ideas

    Mike.
     
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  3. ljrgas

    ljrgas

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    Call someone who knows what there doing
     
  4. Mike_Guthrie

    Mike_Guthrie

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    Great advice thanks mate.
     
  5. ljrgas

    ljrgas

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    Im not your mate but your welcome
     
  6. stardanny

    stardanny

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    Give it time, it will clear up in time as the air will come out via the vent pipe or the radiators which you bleed later.

    A tip, after refilling heating, run the hot water only and the pump will clear up flow and return pipe between boiler and airing cupboard.


    Daniel.
     
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  7. Mike_Guthrie

    Mike_Guthrie

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    Thanks Danny.

    I did think that but wanted to check. Will give the hw a good run on the taps. I can hear the return pipe venting but figured after a day it would
    Have fixed itself.

    I have drained and filled systems before. (Not this one as the house is new to us) when we moved in the rads were all hit and miss for working and bleeding did it sort it. But discovered the trvs were bad (valve and head)

    Mike.
     
  8. stardanny

    stardanny

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    Don't run the the hot water taps, that's a waste of water lol.

    Switch on hot water only, on the programmer. The pump will run and get the flow and return between boiler and cylinder going, this will usually clear up air lock in return pipe.

    Daniel.
     
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