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Flex Fuel Owner’s Manual
March 2011
13.6 Status Lines for Operating Mode “Pellets auto control”
Boiler is switched off!
The furnace is switched off. If you want to start the furnace, switch it on as described in section 7.
Availability!
The furnace is in standby mode. All calls for heat have been met. The furnace will automatically start if:
• A demand is present for heat.
• the current furnace temperature is lower than the set “furnace target temperature“ less the set
“starting difference”.
Slider gate opens!
The furnace begins a pellets start. First the fuel shut off gate is opened. This takes approximately 3
minutes.
Lambda sensor heated!
The furnace starts up with a pellet start. First the Lambda sensor is heated. This process lasts for 80 seconds.
Boiler being filled!
As soon as the fuel shut off gate is opened and the Lambda sensor has been heated, the feed starts to
run and transports the fuel into the firebox. The duration of this first feeder pulse can vary between 30
and 200 seconds.
Note: Do not open the firebox door after this point. Doing so will cause the air factor to rise and the
furnace may auto shut down. You should not need to open the firebox door during any point of
operation under “Pellets auto control”
Ignition phase!
Once the insert is covered with pellets, the pellets are ignited by the igniter. The ignition pulse is
activated as soon as the air factor exceeds the factory default. This pulse is switched off after a set time
will completely shut off once the air factor falls to its factory default setting. The number of ignition
pulses can vary between 3 and 20. In addition new pellets are periodically fed into the firebox. The
ignition phase is complete when the re-calculated flue gas start temperature at every start is exceeded
and the air factor has remained lower that the factory default for approximately 2 minutes.
Start phase!
When all the ignition conditions have been fulfilled (flue gas has risen, low air factor), the furnace
switches to the “Start phase!“. The duration of the “Start phase!” is limited to 10 - 20 minutes. The speed of
the induced draft fan increases during the start phase and the pellet fill level in the firebox is regulated
depending on the measured air factor. Once the “Start phase!” has finished, the operating status
switches to “Pellets mode!”.
13: Pellets Auto Control
