eta PelletsCompact 20-32 kW, Operation

Page: 53 / 76

ETAtouch controller [Heating circuit] function block
53
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. 5-48: 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.
When should the heating curve be adjusted?
If the rooms are not warming up, you should check the
following points first before changing the heating curve
in the control system. Cold rooms are often not only
caused by an incorrectly set graph.
Rooms with radiator thermostats or room
thermostats
• Check the current setting of the radiator thermostat
or the room thermostat. If a room is not warm, open
the thermostat fully or increase the temperature
setting on the thermostat.
Fig. 5-49: Radiator thermostat and room thermostat
If the room is still not warm in heating mode (within
the preset heating times), the temperature slider in
the control system must be set higher (see chapter
5.6.1 "Operating elements" ) or the heating curve
needs to be adjusted (see 5.6.1 "Operating
elements" ).
If the room is too warm in heating mode,
leave the radiator thermostat and room
controller open, and instead lower the temperature
slide in the control system or the heating curve.
If the rooms are too warm or cold in reduced
operation mode (outside the heating times), only
the [Set-back difference] parameter needs to be
adjusted. See chapter
Fig. 5-53: "Adjust reduced
operation mode" .
• Check the adjusted heating limits in the control
system, see chapter
5.6.3.2 "Setting the heating
limits" . Heating limits that are set too high or too
low can be the reason for rooms being too cold or
too warm.