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Boiler power!

Discussion in 'Plumbing and Central Heating' started by Dannyg78, 10 Feb 2021.

  1. Dannyg78

    Dannyg78

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    Ok guys here’s those codes are saying


    D.0 37

    D.40 71

    D.41 63
     
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  3. MeldrewsMate

    MeldrewsMate

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    Turn the upstairs rads off, then see if the downstairs ones warm up.
     
  4. Dannyg78

    Dannyg78

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    Already tried that half do warm don’t go as hot as upstairs and only half warmed up.. maybe 5 of the 12 downstairs
     
  5. jackthom

    jackthom

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    Is there any microbore going to the downstairs radiators or are they all fed by 15mm pipe?
     
  6. Dannyg78

    Dannyg78

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    All 15mm
     
  7. jackthom

    jackthom

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    All lock shield valves open and no stuck thermostatic valves?
     
  8. Dannyg78

    Dannyg78

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    Yes jack all values are open and tvrs are good
     
  9. Jajodu

    Jajodu

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    Try them one at a time downstairs, close valve's on the others and test individually.
     
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  11. ianmcd

    ianmcd

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    have you got a system by-pass fully open somewhere ?
     
  12. D_Hailsham

    D_Hailsham

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    That's an eight degree differential. The boiler is designed to work with a 20 degree differential. One of the reasons for this is the very high pressure loss across the heat exchanger when the flow rate is high, e.g with a small differential. Increasing the setting of the bypass by turning screw clockwise (1 turn = 10mb change).
     
  13. Razor900

    Razor900

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    Sounds like you may need a low loss header or other form of separation on the system.

    In the meantime try timing the hot water differently to the heating especially if there's no restrictor valve on the cylinder return.

    Or you may just have a weak pump in the boiler. Sounds like it has to work very hard
     
  14. Dannyg78

    Dannyg78

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    I’ve just discovered that the copper pipe leading outside from the boiler is dripping.. could this be a clue to why I have no circulation on the downstairs rads?
     
  15. Jajodu

    Jajodu

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    What's the boiler pressure showing? The only cooper pipe exiting outside from the boiler would be the prv.
     
  16. Dannyg78

    Dannyg78

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    Pressure is showing 2bar while it’s running
     
  17. big-all

    big-all

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    general comments
    probably not in the least applicable in your problem but may not help:D
    any radiator with a cover requires the thermostatic valve to be turned up perhaps 5 or 6 degrees to get a high enough amount off heat out to overcome the increased insulation off the cabinet along with the reduced airflow it causes
    this can be further hindered by furniture or curtains
    as soon as you said 3 story hot enough up stairs i off course thought open plan and hot air rises
    do you have open plan or many doors open ???
    try a close doors as you go regime to see what happens
    this problem can often be exasibated by a " conservatory " open to the down stairs firing heat through the roof faster than a machine gun :(
     
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