THE FUEL
13
Chapter 3
PELLET FEED ADJUSTMENT
The pellet used must comply with the features described by the Standard:
Ö-Norm M 7135
DIN plus 51731
UNI CEN/TS 14961
* Extra ame recommends using pellet with 6 mm diameter.
Using pellet with features di erent to those listed above or for the features of the smokes evacuation plant,
it is possible that the boiler presents alterations respect to its optimal functioning.
If the problem occurs after only a few months working, check that routine cleaning stated
in the boiler booklet, has been carried out correctly.
The boiler is equipped with an adjustment system which intervenes directly on the pellet ow inside the
burner, optimising the combustion process. There can be 2 types of problems correlated to the amount of
fuel: lack of fuel or excess fuel.
Lack of fuel D the pellet is burnt too quickly, preventing the formation of a homogenous base inside the
burner. The boiler may not be able to develop the declared power.
Excess fuel D the pellet is not burnt completely, continuing to build up inside the burner. The boiler may
excessively overheat or create blocking problems.
The regulation to be performed is a percentage. Therefore a modi cation of this parameter will lead to a
proportional variation of all boiler feeding speeds.
Controls procedure:
Press key 3 (menu/ok) to access the menu.
Press key 3 (menu/ok) to access the “ USER MENU”.
Select “ PELLET ADJUSTMENT MENU” using buttons 4(-) and 5(+) and press key 3 (menu/ok) to
con rm.
The value “00” will appear on the display: keys 4(-) and 5(+) can be used to adjust the percentage increase/
decrease desired by 5 points per time (the parameter can be varied with a maximum travel from –50 to
+50).
Increase/decrease the percentage value by 5 points and try the boiler with the new calibration for at least
2 hours.
If combustion improves but is not yet optimal, act as previously for a further 5 points. Repeat the
operation until the problem is solved.
If combustion worsens, act in reverse order in the adjustment.
When the adjustment has been made, press button 1(esc) to con rm and escape.
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