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possible air in pipes - combi boiler in attic

Discussion in 'Plumbing and Central Heating' started by GSpenecr1977, 3 Feb 2018.

  1. GSpenecr1977

    GSpenecr1977

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    Hi.

    Looking for some advice please.

    I have installed a new pump in my boiler,

    I first added some cleaner, let it run for 3 days, drained the system, installed pump, added inhibitor and refilled / vented. (the filling loop is in the attic)

    All the radiators heat up fine and i have bled all the rads and pump.

    When the pump is running i get an intermediate ticking noise (sounds like its coming from under a floor upstairs). I have tried the pump speed on 1, 2 and 3 with no difference, also tried with the boiler temperature on the lowest setting.

    Was wondering if it was possible if air was trapped between the radiators and boiler. The combi boiler is in the attic and not sure if there was a particular way to fill / vent this setup.

    I don't think its expansion in the pipes as this has never been an issue before.

    Thanks for any help.
     
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  3. terryplumb

    terryplumb

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    If rads and pump are fully bled ( did you leave the aav open on the pump ?), its unlikely that system has air in it. More likely heat / expansion of pipes against timber is causing the ticking sounds.
     
  4. dilalio

    dilalio

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    Without hearing the sound it’s hard to advise. Could be expansion or could be a foreign object dislodged during the work, that’s now tumbling around at a bottleneck!
     
  5. bernardgreen

    bernardgreen

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    There should be an air vent at the highest point of the system. If the flow and return pipes enter the bottom of the boiler then there should be a vent on the boiler. If the pipe enter the boiler at the top then there should be an air vent in either flow or return ( or preferable both ).

    Too often an instalation relies on entrapped air being carried round to a radiator where it can collect in the top of the radiator until the radiator is bled.
     
  6. dilalio

    dilalio

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    How can you make that claim?
    I happen to agree with you but then I see dozens of installations a week.
    We always put bleed points at the top of a new system and if removing an old F&E tank and using the rising main as a filling loop point to the existing feed, we utilise the old vent to fit a Tom Thumb or lever valve for venting.
     
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  8. bernardgreen

    bernardgreen

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    I have a couple of friends who as plumbers find systems like that.
     
  9. FiremanT

    FiremanT

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    You must have very exciting nights in the pub.
     
  10. bernardgreen

    bernardgreen

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    Very seldom go to the pub. I do have friends who are not plumbers. :cool:

    EDIT some of them have very good wine cellars. Who needs the pub....
     
  11. have they ever found an installation like the this set up- linear manifold_1.jpg
     
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    DIYnot Local

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