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9.9 Induced draught blower with rotational
speed feedback
The induced draught blower generates a vacuum
in the furnace and thus conveys the volume of air
necessary for the combustion into the furnace or
through the burner pot respectively.
The induced draught blower has a rotational
speed feedback. As a result, a possible deviation
between the target and actual operating state can
be detected and corrected accordingly or with
greater deviations the pellet stove is shut down
(Safety shutdown).
9.10 Flame- or furnace temperature
sensor (Temperature sensor Furnace)
During the „Heating“ mode, the flame temperature
is measured.
The temperature measured is an indicator for the
energy content in the burner pot and thus the
basis for that volume of air which is necessary for
the combustion of the energy content in the
burner pot.
Thereby, in combination with the process-
controlled controller, the ACTUAL flame
temperature is compared with the TARGET flame
temperature and the necessary volume of
combustion air for the combustion of the energy
content which is in the burner pot is drawn in by
means of the induced draught blower.
9.11 Air volume sensor – flow measuring
transducer
The air volume sensor is integrated in the intake
pipe, through which the combustion air is induced.
The air volume sensor measures the actual flow
speed in the intake pipe.
The speed of the induced air blower is dependent
on the volume of air measured by the air volume
sensor (respectively flow speed).
If the defined target air volume (or target flow
speed), could not be reached for any reason
whatever, (e.g. particles of dust in the intake
pipe), then this condition triggers an error
message. (In the controller, a permanent
TARGET/ACTUAL – comparison is performed – if
the deviation is too great, then an error message
is tripped).
9.12 Temperature sensor Waste-Gas
The waste-gas temperature sensor is positioned
on the housing of the induced air blower and
protrudes, cross-wise to the direction of flow of
the waste gas, into the waste-gas duct, is
surrounded directly by the waste gas and thus
measures its temperature and temperature
characteristic (see Picture 12).
With the temperature sensor the temperature and
its characteristic can be measured directly
(accurate to approx. 2°C) in the waste gas and as
a result utilized for the control and regulation.
9.13 Room temperature sensor
The room temperature sensor measures the
ACTUAL room temperature in the area of the
stove.
The room temperature sensor is an instrument for
the TARGET – ACTUAL comparison between
TARGET and ACTUAL room temperature und is
thus the basis for the specification of the required
heating output for the stove.
Picture 18:
1 = Room temperature sensor
2 = Air volume sensor
3 = STB
9.14 STB – Safety Temperature Limiter
The sensor of the safety temperature limiter is
positioned on the worm tube. On reaching a
certain temperature, the STB trips independent of
the controller and disconnects the stove from the
power supply. (heat protection)
9.15 Furnace lining
The furnace is lined at the three surface areas,
left side wall, right side wall and back wall with
composite material.
22


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