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eveready man

eveready Member Posts: 4
I have a beckett A F II burner that keeps shutting down.  I have checked or changed every component on the burner but still shut down at least once a day   any suggestions


  • kcopp
    kcopp Member Posts: 4,441
    What boiler............

    Is it on? That burner had all kinds of issues. What are all the combustion numbers?  Might be better to dump it?
  • meplumber
    meplumber Member Posts: 678
    Nah, don't dump it.

    A little more information would be great.  Exactly what have you done?  Have you had someone look at it with a combustion analyzer?

    Tell us more and maybe post a pic or two and we might be able to help you out.
  • eveready
    eveready Member Posts: 4

    all combustion numbers are good.  have changed motor, control cad cell complete , and nozzle. pump pressure is correct transformer is good. when unit is started up on reset it fires up with no problems just a smooth start up
  • Paul Fredricks_3
    Paul Fredricks_3 Member Posts: 1,557

    Could be the transformer/ignitor. Can you post the combustion numbers?
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
    well there's many things to check...

    Did you check incoming voltage & hz cycles?  Check both legs at the panel, then check at the burner for amp draw, voltage, etc.  In the summer, a voltage drop, will cause the amps to rise/surge, could be trippin out your control. Clamp on to the motor wire to see starting draw (peak/hold).  Then watch the amp draw, see if it's in range and staying there, or if it's rising.

    If its rising, could be the motor (you said you replaced it) or the coupling putting extra stress on the motor, which may not show up until the motor runs a bit.

    Also, there was a recent thread about someone using 80% bioheat, and I found a paper from Brookhaven Lab, discussing the problems with high concentrations of bio, and the cad-cell kicking off the burner.  If this could be the case, let me know and I'll look for/re-post the link

    There was an error rendering this rich post.

  • Greg Maxwell
    Greg Maxwell Member Posts: 212
    AFII Lock Out

    I have been encouraging customers to use the new Honeywell R7284U primary control, as it will give you a reason for lock out. What are your cad cell readings?
  • Steamhead
    Steamhead Member Posts: 16,889

    for excessive vacuum in the oil supply line, which would indicate a restriction someplace. Also check the ignitor, it may have an intermittent failure condition where it only fails to produce a spark every once in a while. Finally, check the supply voltage and grounding. 
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
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