Heat
(this is provided by
the ignition element)
Fuel
(wood pellets are
introduced into the
pellet burner)
Ignition Stage 1
(hot air from the
ignition element is directed
at the pellets to initiate the
first stage of ignition)
Ignition Stage 2
(the flame is developed
from a weak early stage flame
to a more intense flame
by the addition of extra air
from the combustion fan )
Run Mode
(once the photocell reads enough light
and the flue gas temperature is above
a prescribed temperature the system
enters RUN mode)
•Heating Element ON
•Heating Element ON
•Auger ON
•Heating Element ON
•Auger ON (at intervals)
•Exhaust Fan ON
•Combustion Fan ON
•Heating Element ON
•Auger ON (at intervals)
•Exhaust Fan ON
•Combustion Fan ON
•Auger ON (at intervals)
•Exhaust Fan ON
•Combustion Fan ON
Modulation Mode
(when the water temperature rises within
5 C of set point the boiler will start to
reduce to a lower power level that will
maintain the water temperature at just
below the set point)
Standby / Extinguishing
(if in Modulation mode the boiler still
reaches the set point it will extinguish
and enter STANDBY. If the controller
gets a signal to turn OFF the system
will extinguish and enter the OFF state)
•Auger ON (at intervals)
•Exhaust Fan ON
•Combustion Fan ON
•Exhaust Fan ON
•Combustion Fan ON
Pre-Heating
Pre-Load
Variable Ignition
Stabilisation
Run
Modulation
Standby
Extinguishing
Functioning State Process Active Components
44
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