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Borderline Fan Pressure. Clean Heat Exchanger?

Discussion in 'Plumbing and Central Heating' started by Radam87, 9 Jan 2020.

  1. Radam87

    Radam87

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    Hi

    I had my boiler serviced and was told the fan pressure was -4.9.

    The manual says pressure "must be greater than -4.9. Pressures below indicate that the heat exchanger will require cleaning".

    The engineer said it will be fine until next year when it is recommended I have a strip down service. Is this sound advice or does it actually require cleaning? I have a feeling it was cleaned last year by BG but cannot be 100% sure.

    Many thanks
     
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  3. Stadan20

    Stadan20

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    Assuming this is a Worcester. Model would be helpful
     
  4. Radam87

    Radam87

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    Yes Worcester. 532.
     
  5. Stadan20

    Stadan20

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    And the model ......?
     
  6. Radam87

    Radam87

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    532.
     
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  8. Stadan20

    Stadan20

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    Yes borderline I would of suggested the same, providing all other checks were ok
     
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  9. Radam87

    Radam87

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    Cheers. Any advantages or disadvantages to cleaning at this reading? Other tests were passes apparently.

    High Comb:
    CO/Co2 ratio:0.0005
    CO (ppm): 48
    CO2%: 9.4

    Low Comb
    CO/Co2 ratio - 0.0000
    CO (ppm) - 3
    CO2% 8.7

    Tightness test - Not done.
    flue, combustion, burner ratio, ventilation all passed.
    Operating pressure 18.57 mbar
    Heat input 29.73 kW
     
  10. Stadan20

    Stadan20

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    Those readings are fine low is out by 0.1 but literally nothing to worry about , a full strip and clean of main heat exchanger will prolong the life and efficiency of the boiler and if it hasn’t been done before I would highly recommend that it is done as the burner seal is probably the original , also if the electrodes haven’t been replaced and you still have the original sight glass type I also would recommend they get replaced with the upgraded type.... was the kw rating also noted on the certificate ?
     
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  11. Radam87

    Radam87

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    Electrodes have been changed. Not too sure about the seal.
    Heat input 29.73 kW?
    Have a feeling it was strip cleaned last year.

    They said on the summary sheet I had no approved CO alarms but I pointed them out to them at the start ...
     
  12. Stadan20

    Stadan20

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    Kw rating is within , depends on what was done on the strip clean , there is one way they could of just taken off an inspection hatch and semi cleaned the main hex but there is no way that I can really tell from here lol . Maybe the service engineer added notes on the service sheet from last year what was done ?
     
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  13. DIYnot Local

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