Handleiding Haas-Sohn COMPACT-PELLET 309 (pagina 8 van 40) (Engels)

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this quantity of fuel is ignited by means of an

igniter.

The „Start phase“, which is divided into 10

zones, is ended after a precisely defined

temperature is reached on the „Temperature

sensor – waste gas“ and the controller

switches over to the operating state

„Heating“.

After completion of the start phase the igniter

is switched off.

The switchover from the „Start phase“ to the

operating state „Heating“ is only dependent

on the temperature measured at the

„Temperature sensor – waste gas“, i.e. the

completion and thus the duration of the „Start

phase“ can differ with regard to time.

The length of the start phase is however

limited with a time of 20 minutes.

If no flame formation can be achieved during

this 20 minutes or the required temperature

on the „Temperature sensor – waste gas“

cannot be reached, then a safety shutdown is

initiated.

During the start phase, the volume of air and

speed of the induced draught blower is

measured and monitored by means of

rotational speed feedback.

5.3. Heating Mode

After the positive conclusion of the „Start

phase“, the stove switches automatically to

the operating state „Heating“.

In the operating state „Heating“, the heating

output of the stove is adapted modular to the

room temperature, respectively to the

difference between actual room temperature

and target room temperature.

If the different between target room

temperature and actual room temperature is

great, then the stove heats with a greater

heating output (maximum with 8 KW).

The more the actual room temperature

approaches the target room temperature, the

more the heating output of the stove is

reduced (minimum heating output = 2.5 kW).

According to the required heating output, the

respective quantity of fuel is conveyed by the

screw conveyor in cycles over the pellet chute

into the burner tray.

During the operating state „Heating“ the

flame- or furnace temperature just above the

flame is measured using a special

temperature sensor, whose signals are

processed in the controller and are the basis

for the relationship „Energy content in the

burner tray“ and supplied volume of

combustion air, through which an „ideal

combustion“, respectively a high degree of

efficiency, is ensured.

The supplied volume of air is measured using

a special air-flow measuring device and

checked by means of a continual target/actual

comparison.

After reaching a waste gas temperature of

about 130°C, the convection air blower is also

switched on and its speed adapted modular

to the respective waste gas temperature and

thus to the respective heating output.

During the operating state „Heating“, the

speeds of the components, induced draught

blower and convection air blower, are

monitored by means of rotational speed

feedback and a continual comparison

between target- and actual speed is

performed.

With a greater difference of the actual speed

compared to the target speed, a safety

shutdown is initiated and an error message

displayed on the display of the control unit.

During the operating state „Heating“, the

maximum and minimum heating output is

limited by the respective safety limit values

(maximum and minimum waste gas

temperature), i.e. if the maximum waste gas

temperature is exceeded during the operating

state „Heating“, or the minimum waste gas

temperature is undershot, then a safety

shutdown is initiated.

5.4. Measurement – Degree of soiling of

burner tray during the heating

operation

During the operating state „Heating“, the

measurement of the degree of soiling of the

burner tray is performed every 30 minutes.

This measurement is performed independent

of the heating output stage, in which the stove

is presently in.

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