How Tom connect new rads in loft conversion back to existing system ?

Discussion in 'Plumbing and Central Heating' started by Al Owen, 25 Sep 2017.

  1. Al Owen

    Al Owen

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    Hello. New here and this is my first post.
    I have almost completed a loft conversion in my own home. All pipework and rads are in place. Soon I need to connect up my new plumbing to the existing flow and return pipe stubs ends coming up from downstairs.

    My question is :
    How do I get the pressure out of the existing system, in order that I can remove the speed fit stop ends currently on the flow and return pipes ?
    I do not want to drain down the whole system - just remove enough pressure so as to stop getting my hands wet up in the new loft. !
    Advice would be gratefully received !
     
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  3. stem

    stem

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    First of all, you need to tell us what type of system you have, and how it is pressurised. Is the boiler fed from a storage tank. Something like this:

    [​IMG]

    Or is it a system boiler that has to be pressurised manually by opening a valve and watching a dial / display until the operating pressure is reached, something like this:

    [​IMG]
     
  4. Al Owen

    Al Owen

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    Thanks Stem. It's the second pic. A Combi boiler. - A Glowworm. Meant to state that in the original post.
     
  5. dilalio

    dilalio

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    Isolate an upstairs rad or towel rail.
    Put a tray or rubble sack underneath one of the valves.
    Crack the union nut or 1/2" nut that goes from valve to rad/rail.
    Allow rad water to dribble into tray or bag. Tightening nut back up and emptying full tray or bag into a bucket.
    When rad empty, tighten nut and open valve - water from rest of system will flow in and reduce system pressure.

    Or you can use a downstairs draincock (if present) to remove a bucket or two of water!

    Or use the drain valve on the boiler.
     
  6. Al Owen

    Al Owen

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    Thanks Dilalio.
     
  7. dilalio

    dilalio

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    (y)
     
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