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Heating circuit
5.1.1. Operating mode of the heating circuit
It is recommended to keep the Heating mode setting.
5.1.2. Summer/Winter day
Here the outdoor temperature is set for automatic transition between the Winter and Summer
modes in the Day mode. (Note: the Summer mode will switch off heating.)
5.1.3. Summer/Winter night
Here the outdoor temperature is set for automatic transition between the Winter and Summer
modes in the Night mode.
5.1.5. Heating curve
According to the heating system type, the heating curve slope can be set depending on the
outdoor temperature. Should overheating or underheating occur, the flow temperature can be
modified using the Day correction (5.1.6.) or Night correction (5.1.7.).
If at certain outdoor temperatures the building suffers from overheating and at other outdoor
temperatures underheating occurs, it will be necessary to change the curve slope or use a
split curve.
The slope of 0.6 is usually set for underfloor heating, 1.1 for low-temperature radiators and
1.6 for high-temperature radiators.
For more info on the split curve, consult Chapter 5.1.5. of the complete Instruction Manual for
the controller.
5.1.9. Minimum flowu (Tmin)
The minimum flow temperature kept while the heating circuit is on.
5.1.10. Maximum flow (Tmax)
When this temperature is exceeded, the heating circuit pump will be switched off.
5.1.14. Heating circuit off
Summer = the heating circuit will be shut off when the summer mode conditions are reached
(5.1.2. a 5.1.3.).
room = the heating circuit will be shut off when the summer mode conditions or the
desired room temperature are reached
5.1.18. Overload protection (thermal store cooling)
This function permits thermal store cooling after the critical temperature (5.1.18.2.) is
exceeded. While in the active protection mode, the controller will mix heating water to the
max. HC temperature (5.1.10.) until the temperature drops by 5 °C.
5.1.23. Fast boiler loading
If the quick heat function is not activated and the water in the system is cold, the load valve
returns a significant portion of the heated water back to the boiler. This ensures a minimum
temperature of water entering the boiler, but at the same time only a small amount of heated
water enters the heating system. However, because the pump draws a much larger quantity
of water into the heating system, a significant proportion of the heating water is also drawn
from the cold thermal store. The heating water is then lukewarm and fails to heat the house
sufficiently. Moreover, the temperature rise in the heating system is slow because the water
in the thermal store is also heated (by the return water from the heating system) at the same
time as the house is heated. The quick heat function prevents these phenomena and therefore
prevents the simultaneous heating of water in the thermal store, thus allowing better use of
the heat for heating the house as a priority.
Detailed description of the action: the quick heat function closes the mixing valve (optionally
also stops the circulation pump 5.1.24.) to the heating system until the desired heating water
temperature (optionally also fixed temperature 5.1.25.) is reached at the upper sensor of the
thermal store. This prevents cold water from being pumped out of the thermal store.
