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3. OPERATION AND FUNCTION OF THE CONTROLLER
3.7
CONTROLLER
In this menu, all adjustments for the hydraulic part of the eXcess PRO can be made.
The target temperature, the minimum temperature and the maximum store temperature have
already been adjusted during commissioning.
Adjustment
Description
channel
Targ. temp.
Target temperature
TFlowmax
Maximum flow temperature
TStoremax
Maximum store temperature 30 ... 75 °C
Minimum temp. Minimum temperature
Pressure monitoring switch-
Pressure on
on threshold
Pressure monitoring switch-
Pressure off
off threshold
Min. speed
Minimum speed
Max. speed
Maximum speed
Reserve which is not used for
Reserve
heating
If the adjusted value for the minimum temperature is exceeded at S1, the pump switches on.
The controller aims to keep the flow temperature at the adjusted target temperature. For this pur-
pose, the controller adjusts the pump speed. The minimum and the maximum pump speed can be
adjusted by means of the parameters Min. speed and Max. speed.
If the target temperature is exceeded, the pump speed increases up to 100 % (in steps). The electric
heating remains switched on during this process.
If the temperature at the flow sensor reaches the adjusted maximum flow temperature, the electric
heating switches off and the pump continues to run for a few seconds.
If the temperature at the store sensor reaches the adjusted maximum store temperature, the elec-
tric heating switches off and the pump continues to run for a few seconds. The controller changes
to the Max. temp. status (maximum shutdown).
The maximum shutdown is used for shutting down the electric heating when the store has reached
its maximum temperature.
If the system pressure falls below the switch-on threshold, the electric heating switches off. This
prevents vapour formation and boiling noises in the electric heating. If the system pressure exceeds
the switch-off threshold, the electric heating switches on.
The Reserve is an adjustable excess power which is fed into the grid and not used for heating. The
reserve can be used, e.g. in large PV systems, in order to start the heating at a later point in time.
This reduces power peaks at noon.
NOTE
The target temperature is blocked against the minimum temperature by 10 K.
Adjustment
Factory setting
range / selection
45 ... 70 °C
70 °C
55 ... 85 °C
85 °C
65 °C
35 ... 65 °C
55 °C
0.3 ... 1.5 bar
0.8 bar
0.4 ... 1.6 bar
1.0 bar
5 ... 100 %
15 %
24 ... 100 %
100 %
0 ... 9000 W
100 W
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