42
Flex Fuel Owner’s Manual
March 2011
11.6 Status Lines During Furnace Operating Mode “Bulk materials”
Boiler is switched off!
The furnace is switched off. Press and hold the Control Knob for 3 - 4 seconds if you now want to start
the furnace using bulk materials.
Stop system!
The furnace has just fully completed the combustion cycle for bulk materials; furnace operating mode
“Bulk materials auto control” may be selected at any time.
Stop system! Fire bed monitoring!
The last combustion cycle for bulk materials has just been completed; however the flue gas temperature
is still too high which means that the controller continues to monitor the fire bed.
Please ignite!
The heating procedure can now start. The operating status changes to “Bulk materials!” once the
flue gas temperature exceeds the factory default flue gas start temperature.
Bulk materials!
The combustion of bulk materials is still in progress. If you want to add more material, please start
smoldering gas extraction. The combustion of bulk materials has finished (status “Stop system!”) when
the flue gas temperature drops below the factory default switch-off temperature and the air factor is
above 2.50 for several minutes (factory default setting 10 – 20 minutes).
Bulk materials! Part load!
When the furnace is in “Bulk Materials” mode and there is no call for heat, the furnace may enter “Bulk
materials! part load” to avoid overheating. So that it does not overheat, the furnace is controlled based
on the required furnace temperature (factory setting) with its speed adjusted down. This occurs if
the demand for heat is too low, or the buffer has already been completely loaded and there is still bulk
material in the firebox. If this status line is displayed, you should not fill up with any more fuel.
However
if you still continue to fill with fuel, this can lead to overheating of the furnace or reduced
combustion. Which may cause sooting of the chimney or heat exchanger.
Smoldering gas extraction! SAF reference run!
You have activated smoldering gas extraction. Wait until the reference run of the secondary air flap has
completed before adding more bulk material (maximum duration 50 seconds).
Heat exchanger cleaner is waiting to be released!
Heat exchanger cleaning is released if:
• a time release is set (
section 9)
• the furnace is cooled (below factory default)
• the flue gas temperature is low
Heat exchanger cleaning is active!
The furnace immediately carries out its heat exchanger cleaning. The duration of the cleaning impulse is
system specific and can vary between 3 and 20 minutes.
11: Bulk Materials Mode
