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Discuss Anyone any idea why FGT is 252c in the Oil and Solid Fuel Forum area at UKPlumbersForums.co.uk.

  1. Thomas

    Thomas New Member

    hi all, came across this today upon doing a service. Everything on o2,c02 was correct, pressure and air correct. New nozzle and correct size but Reading 252c on fgt. anyone any idea what could cause this? I usually aim for around 190-220. It is a 16 year old bluebird

    Thanks
     
  2. Best

    Best Trusted Plumber

    Where was the fgt taken from?
     
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  3. Thomas

    Thomas New Member

    Hi best,

    I used the hole that has been drilled near bottom centre of the flue near were it meets the boiler.
     
  4. Best

    Best Trusted Plumber

    I assume you mean a hole drilled in the actual flue?
    I just was checking that, because was thinking you maybe were using the cleaning door test point, which would be too hot.
    Ideally on a standard efficiency oil boiler the flue test hole should be away from top of boiler a little - 300mm if possible in my opinion.
    Are the boiler baffles in good condition plus staggered properly and shell clean?
    If all correct then your nozzle maybe faulty, or nozzle has got mixed up and wrong labelled nozzle container. Seen new nozzles faulty putting out too much oil.
    Maybe just check oil pressure with a different gauge to be sure your oil gauge was reading ok.
     
    • Like Like x 1
  5. Thomas

    Thomas New Member


    Yes there was a hole from previous services. All is in good order internally and baffles back in correct order. I might pop back tomorrow and try another nozzle, the flue is the old type with enamel coating on bottom half
    Thank you for your reply
     
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  6. Best

    Best Trusted Plumber

    I edited my above post and added a couple of points to check
     
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  7. Thomas

    Thomas New Member

    Thank
    Thanks mate, I will check pump pressure again also all readings were perfect and no other dramas bar the fgt.
     
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  8. Best

    Best Trusted Plumber

    Doesn’t happen often, but sometimes a faulty brand new nozzle causes bother.
    I saw a 120 Warmflow Bluebird that was burning serious and put pure bitumin coating (literally) on inner shell. Turned out it was the service idiot had just prior to this, put a new nozzle - a 0.5 instead of a 1.0 gallon Danfoss nozzle. Was seriously overaired
     
    • Like Like x 1
  9. Thomas

    Thomas New Member

    Would that kind of temperature be a real drama?
     
  10. Best

    Best Trusted Plumber

    Maybe not on your boiler.
    I forgot to ask you what output of boiler it was?
    I find the Warmflows of that vintage had tight baffles that get easily damaged if severe heated and although if lots of sulphur blocks around the baffles it obviously results in them being over heated, it also happens to fairly clean ones
     
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  11. Thomas

    Thomas New Member

    I think it was 26.4kw output
     
  12. Best

    Best Trusted Plumber

    An example of real overheat was on a 50/70 bluebird I went to service and discovered NO baffles. The oil pressure had been accidentally raised by the tenant to I think near full gauge pressure . But it had been left like that for a long time.
    The two baffles had just nearly disappeared, with just fragile thin pieces of metal in boiler base.
    Must have cost some kerosine :p
     
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  13. Best

    Best Trusted Plumber

    Fairly big boiler then. Flue temperature should be low on that though.
     
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  14. Thomas

    Thomas New Member

    Yeah I was thinking around 180 to be honest. I will look further into it

    Thanks
     
    • Like Like x 1
  15. Thomas

    Thomas New Member


    At least they were heating the atmosphere :)
     
    • Funny Funny x 1
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