Fuel indicater comes on to early sometimes.

woodsmaster Posted By woodsmaster, Dec 31, 2012 at 12:01 PM

  1. woodsmaster

    woodsmaster
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    Jan 25, 2010
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    Sometimes I go out to the boiler to find the "FUEL" displayed and fans off and still have 3/4 load of wood in it. It don't do it a lot, but why does this happen ? I'm considering a trip away for a week or two and have no real backup heat. I'm afraid my friend will come fire the boiler, leave and it will fuel out. Any
    Ideas ?
     
  2. maple1

    maple1
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    Bridging?

    I have that happen sometimes after building a new fire - darn thing will burn out on the bottom & the wood won't fall down into itself. Smokes pretty good when that happens too.
     
  3. woodsmaster

    woodsmaster
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    Don't think that bridging is causing it.
     
  4. Clarkbug

    Clarkbug
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    I would have guessed what Maple said. Someone who knows the biomass controller will probably have a better answer for you....
     
  5. taxidermist

    taxidermist
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  6. woodsmaster

    woodsmaster
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  7. woodsmaster

    woodsmaster
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    Read it but still don't really understand it.
     
  8. Fred61

    Fred61
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    The low fuel senses temperature of the flue doesn't it? Correct me if I'm wrong. If so, After an idle period when the combustion fan re-starts and the fire is slow to get going, could the low fuel sensor be triggered in that period?
     
  9. taxidermist

    taxidermist
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    No-fuel testing time during fuel firing start [Fd60] - after switching to
    WORK mode, if water temperature doesn't reach temperature set with the
    thermostat in programmed time, the control process will be turned off and
    the display will show the message: [FUEL].
    You can return to previous mode by pressing STOP button......so this means after 60min if you water temp dosent reach your set dial temp it will shut the boiler down.


    No-fuel testing time during work mode [Fb30] - in WORK mode, if
    temperature of water in the boiler decreases below temperature set with
    the thermostat, by hysteresis value, and don't reach temperature set with
    the thermostat in programmed time, the control process will be turned off
    and the display will show the message: [FUEL]. You can cancel the alarm...... this one means if you your boiler water temp drops below your set temp for 30min while in work mode it will shut your boiler down.(this is what yours is doing) Increase both numbers.

    the hysteresis is the number you set less than your dial temp to shut down the pump or when your blower shuts down this will be your Ph setting and also your H setting. both numbers are * factory set is Ph4* and H10* I set my ph to the min of 2* so the pump shuts off at 168* with a launch of 170*

    Hope this helps,
    Rob
     
  10. taxidermist

    taxidermist
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    No not on these units
     
  11. woodsmaster

    woodsmaster
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    Thanks for putting it in plain English for me rob. that does help me. with storage it never reaches dial temp in 60 min.
    My boiler is almost always in work mode. No exhaust sensor in these.
     
  12. Tennman

    Tennman
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    WM, Although it may not look like the obvious burned out dome often seen in bridging, I see that happen often when a good coal bed doesn't develop. The clear/open paths to the nozzle are many and look like a grate. Essentially every time that happens on a full load I shake the charred wood to re-establish compaction. Open the damper and the bottom door to re-establish a hot coal bed for a few minutes and usually she's off again for keeps. We may call that something other than bridging but it's still too much unheated air going thru the nozzle. Can I invent a new term??? Vane-ing, grill pathing, strainer paths.... Well you get the idea. My first solution is to keep at least a minimal coal bed. Second if I don't have any coals is lots of small, dry stuff and much smaller splits on top of that.

    In virtually every time I've seen it, it was due to too little air flow restriction normally provided by the coals before the nozzle resulting in cool exhaust temps.
     

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