27
Heating temperature decrease
Heating temperature decrease is a parameter that is set according to a selected "circuit control" option (set by
the Service).
For manual control, the temperature decrease of the heating system is set in %. The temperature
decrease is set in the
CH Program
option (see description below).
For installations equipped with a room thermostat (no weather sensor), the measuring input short-
circuit of the room sensor is a signal to the controller to lower the heating temperature by a set % value. For
installations with a mixing valve, the valve will be closed and the temperature of the boiler will be decreased.
For installations with an external sensor (the "circuit control" option needs to be set by the Service), the
decrease is set in °C. The set value should apply to room temperature reduction. The controller will convert it to
a heating temperature decrease value taking into account the current external temperature and the set
weather characteristics.
NOTE:
1. PELLET fuel set.
If the boiler temperature decrease is high, the regulator can stop the boiler. For a several-degree decrease
(especially for the PID option enabled - see: Advanced/boiler/PID), the regulator will reduce power output
without stopping it.
2. WOOD fuel set.
The boiler temperature will not be reduced below the
minimum boiler temperature
allowed by the
manufacturer that is set in service parameters. Due to the risk of corrosion (a phenomenon of dew presence in
the burning chamber), the controller maintains a minimum temperature in the boiler (see the minimum
temperature parameter).
SUMMER/WINTER/AUTO
2
modes
This parameter is used to manually switch the regulator into the SUMMER or WINTER mode. Moreover, the
AUTO mode can be chosen - the controller will automatically switch into the WINTER or SUMMER mode based
on the outside temperature.
In the summer mode only Hot Water is operated. In the WINTER mode, the controller controls the entire heating
(CH + HW).
Weather characteristics
3
If the Service sets an option that uses the external sensor, the menu will display a possibility to set weather
characteristics. The regulator has 13 ready-made characteristics to choose from. They were prepared for
buildings with different thermal isolation and different heating systems. When choosing the right option for a
specific building, attention should be firstly paid to the heating type. For underfloor heating, characteristics in
the range of 1-4 should be chosen, for radiator heating, 4-13. Then, insulation quality should be assessed. The
worse the thermal insulation of the building, the higher the number of characteristics should be. The best
solution is to select the average value. For underfloor heating it is good to set number 3, for radiator heating -
number 7.
The full range of characteristics offered by MULTIFUN is presented further.
2
The AUTO operation mode is possible only for configurations with the external sensor. For simple options, the
AUTO mode is not displayed. See „circuit control”.
3
The parameter is visible only after setting the operation configuration with the external sensor in the „Circuit
control” (two configurations are available)
