Download Bixby Energy MaxFire Operating instructions

FINE TUNING THE UBB (CONT.)
ASH DUMP PROCESS:
The UBB performs an ash dump according to the amount of fuel that has been fed. At the time of an ash dump, the upper pot
should have approximately 1/2” to 3/4” of burning embers. These embers are required to maintain a flame during and after the ash
dump process.
Before adjusting the ash dump frequency, be sure that the UBB is burning properly (neither too rich nor too lean). The ash dump
frequency rarely needs adjustment for typical shelled corn and wood pellets. Adjustment to this setting only occur with fuels with
exceptionally low or high ash contents such as switch-grass or some premium grade wood pellets. The ash dump frequency trim
pot should only be adjusted if the upper burn pot is filling with ash, not unburned fuel. Unburned fuel is a result of burning with
the feed rate too high (rich).
HIGH ASH CONTENT:
The ash dump frequency can be adjusted to burn fuels with high ash content, such as switchgrass and low quality wood pellets.
If the ash level is less than 2-1/2” from the top of the burn pot immediately prior to the ash dump, turn the ash dump frequency
knob clockwise (i.e.1.5x). It may take many iterations to dial in the ash dump frequency because it can be many hours between ash
dumps. Increase in small increments as necessary.
LOW ASH CONTENT:
If the fuel appears to be burning properly (neither too lean nor too rich), but the embers are completely dropped during the ash
dump cycle, turn the ash dump frequency counter-clockwise (i.e. 3/4x or 1/2x). This will reduce the frequency of the ash dump and
permit embers to build-up into the upper pot. It may take many iterations to dial in the ash dump frequency because it can be many
hours between dumps. Reduce in small increments as necessary.
CORRECT
Ash height prior to ash
dump
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