ETAtouch controller [Heating circuit] function block
7.6.3 The heating curve
Description of the heating curve
The heating curve regulates the flow temperature for
the heating circuit. Each heating circuit has its own
heating curve, as underfloor heating requires different
settings from radiators.
The heating curve is adjusted in the settings of the
heating circuit ( button). Open this and then change
the heating curve in the menu with the [Heat curve]
button. The settings for the heating curve are
displayed.
Fig. 7-59: Heating curve settings
1 Heating curve for heating mode (red line) and
reduced operation mode (blue line)
2 Parameters for setting the heating curve and the
heating limits
3 Change settings for the heating curve in heating
mode or reduced operation mode
The two adjustable parameters [Flow at -10 °C]
and [Flow at +10 °C] are used to define the
heating curve for the heating mode (red line in the
diagram). The resulting line is the heating curve of the
heating mode (within the preset heating times).
The heating curve for reduced operation mode (blue
line in the diagram) is determined by a parallel shift of
the heating curve of the heating mode. This shift is set
via the [Set-back difference] parameter.
Based on the current outside temperature, the control
system uses the heating curve to calculate the
required feed temperature for the heating mode. For
example, an outside temperature of -10 °C would
result in a feed temperature of 33 °C (see diagram).
Fig. 7-60: Heating curve of underfloor heating
1 Maximum flow temperature
2 Parameter [Flow at -10 °C] is used for adjusting the
heating curve for outside temperatures below
freezing
3 Parameter [Flow at +10 °C] is used for adjusting
the heating curve for outside temperatures above
freezing
4 Heating threshold for heating mode
5 Heating limit for reduced-temperature mode
If an ETA room sensor is installed for the heating
circuit, the flow temperature calculated on the
basis of the heating curve is corrected. The actual flow
temperature will then differ from the calculated
temperature value.
For each heating circuit, separate heating limits are
adjustable for heating mode (within the set heating
times) and reduced operation mode (outside the set
heating times). If the current outside temperature
exceeds the configured heating temperature (for
example 18 °C), the heating circuit is switched off. The
same applies to reduced-temperature mode as soon
as the outdoor temperature exceeds the set heating
limit.
The [Flow max] parameter determines the
maximum flow temperature for the heating circuit,
to protect it from overheating. The factory setting is 45
°C for underfloor heating, and 65 °C for radiators.
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