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March 2011
Flex Fuel Owner’s Manual
13: Pellets Auto Control
13.4 Starting the Furnace in Operating Mode “Pellets auto control”
Setting the Furnace Operating Mode
Verify that the furnace operating mode is currently set to “Pellets auto control” . The operating mode
line must read “Pellets“. If it is in “Bulk materials” , change the furnace operating mode as described on
section 10.
Switching the Furnace On
Switch on the furnace as described in section 7. The status line may be used at any time to verify the
current operating status. The furnace will now fire when there is a demand for heat.
13.5 Opening the Firebox Door During the “Start phase!” or in “Pellets mode”
Normally one should avoid opening the firebox doors for any length of time during the “Start phase!”
or in “Pellets mode!" since this alters measurements of the air factor or flue gas temperature and will not
guarantee correct regulation characteristics. The air factor and flue gas temperature are therefore
constantly monitored; the furnace will shut down if these values deviate from their expected values.
(status line “FGT-drop or air factor too high”) This monitoring function can be deactivated as it is
occasionally necessary to open the firebox doors and look inside the firebox. The monitoring function is
only active in operational states “Start phase!” or “Pellets mode!”.
If the start screen is shown on the display, press and hold the control knob for 3 to 4 seconds; the
following is then displayed: Flue gas and air factor monitoring has been de-activated!
The start screen is then displayed again. The user is also notified by the information message “Monitoring
deactivated!” above the usual status line.
The firebox doors can now be opened during operation without the furnace shutting itself
down. The monitoring function is manually activated by pressing and holding the ESC button or
automatically reactivated after 5 minutes.
The following message appears on the display for several seconds:
Flue gas and air monitoring has been re-activated!
The monitoring function has now been reactivated; do not re-open the doors during operation
(otherwise “FGT-drop or air factor too high! Fan lag!”).
