Pre-Load
A pre-defined starting dose of pellets is given into the burner by the auger.
Variable Ignition
This stage starts the ignition process.
-The heat from the ignition element is directed at the pellets by the fan which runs at a
relatively slow speed.
-At intervals the auger introduces more pellets once the flame has begun to establish.
-The flue gas temperature probe measures the temperature in the flue.
-At the end of this stage if the flue gas temperature is over a pre-defined temperature the
process continues to the next stage (Stabilisation)
-If this variable are not satisfied then this stage continues for another minutes (second
ignition attempt) and if the variable has not reached its value by the end of the second
attempt, EXTINGUISHING will occur and an Er12 (Failed Ignition) will be displayed on
the screen.
Stabilisation
This stage develops the flame even further before allowing the system to enter RUN
mode.
-The auger introduces pellets more frequently into the burner.
-The combustion fan and exhaust fan increase in speed to speed up the combustion
process.
-The ignition element remains on in this stage.
-At the end of this stage if the flue gas temperature is over a pre-defined temperature the
process continues to the next stage. (Run mode)
-If this variable are not satisfied then this stage continues for another minutes (second
ignition attempt) and if the variable has not reached its value by the end of the second
attempt, EXTINGUISHING will occur and an Er12 (Failed Ignition) will be displayed on
the screen.
Run Mode
During run mode the combustion rates are pre-set for the 5 different power levels.
-On entering this phase the system starts at Power Level 1 and after defined time intervals
increases a Power Level each time until Power 5 is reached.
-The boiler will continue to run at Power 5 until the water temperature reaches within 8°C
of the set point.
-The ignition element is off during this phase.
-The auger ON/OFF values are pre-set for each of the power levels.
-The circulation pump is activated by the controller once the water in the boiler reaches
40°C. The pump will turn off once the temperature drops to 38°C.
-If the unlikely event that the flue gas temperature decrease below pre-set low value for
a period of time then Er13 will appear to indicate that the light has gone out. This may be
due to a lack of pellets entering the combustion tube due to dust or poor quality pellets.
Modulation Mode
The modulation range has been pre-set so that the system starts reducing to a lower
power level when the water temperature comes within 8°C of the set point.
