19
2.
Operation
2.7 Operating phases
2.7.1 Standby
During this operating phase, the controls do not transmit requests for heat. The
burner is switched off and the boiler temperature setpoint is 0 °C.
After an hour in standby mode, the display is shut down fully, only the green LED
is lit up. The display is switched back on by pressing a button or when there is
a heating requirement.
Fig. 28
Boiler temperature
Standby
Info
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°C
Fig. 29
Boiler temperature
Purging
Info
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°C
2.7.2 Purging
The Induced draught fan runs, the combustion chamber of the boiler is flushed
through with fresh air. This phase can last several minutes before the burner
fires.
2.7.3 Ignition phase
The Induced draught fan runs, pellets are transported into the burner pot and
are ignited. When flame formation is detected, the system switches over to fla-
me stabilisation.
2.7.4 Flame stabilisation
Following the ignition procedure, even combustion is established and then the
system switches over to modulation mode.
2.7.5 Modulation mode
The burner is in modulation mode. The output is infinitely varied between 30 %
and 100 %.
2.7.6 Burnout
Combustion is stopped. Pellet transport into the burner pot is stopped, the In-
duced draught fan continues to run until all the remaining pellets have been
burned and the burner pot has cooled down.
2.7.7 Burner OFF
There is a heating requirement from the control system, but the boiler tempe-
rature (actual value) is higher than the boiler temperature setpoint. This means
combustion is stopped and the burner is switched off.
Fig. 30
Boiler temperature
Ignition phase
Info
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°C
Fig. 31
Boiler temperature
Flame stabilisation
Info
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°C
Fig. 32
Boiler temperature
Modulation mode
Info
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°C
Fig. 33
Boiler temperature
Burnout
Info
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°C
Fig. 34
Boiler temperature
Burner OFF
Info
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°C
