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DIRECT hEATING CIRCUIT
Required supply temperature for the direct heating circuit is provided directly by controlling
the boiler temperature.
heating switch off
If the calculated stand-pipe temperature isn't for few °C higher than the room temperature,
the heating is automatically switched off. Heating is automatically switched off if room
temperature is not measured and when outdoor temperature approaches the required
temperature. The temperature difference at which the boiler will switch off can be increased
or decreased with parameter S3.13.
At automatic heating switch off, a temperature of 4 °C is set for stand-pipe temperature and
the circulation pump is switched off with delay - parameter S3.16. Other pump operation
modes can be selected with parameter S3.4.
LIqUID FUEL BoILER
For the required liquid boiler temperature, the highest temperature from the list below is
taken:
- calculated first stand-pipe temperature, increased for the value of parameter S5.3,
- calculated second stand-pipe temperature, increased for the value of parameter S5.4,
- requested d. h. w. temperature, increased for the value of parameter S5.5,
- calculated boiler temperature of an additional direct heating circuit,
- calculated boiler temperature from slave controllers in BUS connection.
The lower limit of the liquid boiler temperature is the minimum boiler temperature - param-
eter P5.1, and the upper limit is the maximum boiler temperature - parameter S5.1.
Burner hysteresis is set with parameter S5.2. Burner switches off when boiler
temperature exceeds the calculated boiler temperature for more than 60 % of the hyster-
esis, and switches back on when boiler temperature drops below more than 40 % of
the hysteresis.
With parameter S5.2 you can select an alternative burner operation mode:
S5.2=1, operation of burner without boiler temperature sensor. Burner output is activated
when there is no need for heating. Burner output is deactivated when there is need for
heating.
S5.2=2, operation of burner without boiler temperature sensor. Burner output is activated
when there is need for heating. Burner output is deactivated when there is no need for
heating.
When there is no need for boiler operation, the calculated boiler temperature is 4 °C.
In the following cases, the frost protection function can activate boiler:
- if outdoor temperature drops below the frost protection temp. - parameter P1.3
- if boiler temperature, stand-pipe temperature or room temperature drops below 4 °C.
Service setting manual
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