2 Product information
6
2.2 Construction and function
Vitolig 300
Construction
Essentially, the Vitolig 300 comprises a
pellet feeder (l.h. side of the boiler) and a
combustion part (r.h. side of the boiler).
The pellet feeder on the l.h. side of the
boiler comprises the pellet hopper
A
with cleaning aperture, the hot air fan for
automatically igniting the pellets
B
, the
feed worm (pellet worm−drive)
C
with
drive motor, the drive motor for removing
ash from the burner tray, the motor for
the heating surface cleaning facility and
the motor for the automatic ash removal.
The r.h. side of the boiler (combustion
part) comprises an operating part
D
with
boiler control unit and heating circuit
controller HKR for one heating circuit
with mixer and DHW cylinder thermostat,
the pellet feed channel
E
, the burner
tray
F
with automatic ash removal and
the automatic ash removal system
G
. On
the r.h. side of the boiler is the ash trolley
for the automatic ash removal system.
Function
Prior to the initial start−up check, whether
the system contains water and has been
vented.
The Vitolig 300 starts automatically, as
soon as a heat demand is reported to the
control unit.
After the pre−purge (safety function, only
for combustion chamber temperatures
above 190
º
C), the ignition starts (hot air
fan), and the pellet worm−drive is
activated. The burner tray is filled with
pellets, the hot air fan ignites the pellets
and the boiler starts its heat−up phase.
A flame has been built, if the temperature
in the combustion chamber rises by 70 K,
after the heat−up phase commences. The
hot air fan is switched off and runs on for
a further minute without heat.
Vitolig 300 begins to modulate when the
temperature inside the combustion
chamber rises above 240ºC. In
modulating operation, the pellet
worm−drive feeds the required volume of
pellets into the burner tray, and the
vacuum draught fan will run at a speed of
between 800 and 2400 rpm.
The fuel will be completely burnt if the set
boiler water temperature is exceeded by
15 K for 15 minutes or if the boiler water
temperature rises above 82
º
C.
Subject to the output and combustion
state, the pellet worm−drive will either be
stopped immediately or runs on for a
further 3 minutes with the smallest
volume of fuel. During the complete
combustion mode, the fan will run at
1500 rpm. Below a combustion chamber
temperature of 250
º
C the fan will run on
for two minutes.
The combustion process is completed
with the removal of the ashes from the
burner tray.
5822241 GB
D
A
E
F
C
B
G
