6.7 Circulation pump operation during storage tank charging
With the setting CO4 -> F11 - 1, the circulation pump continues operation according to the
programmed time schedule even during storage tank charging.
With the setting CO4 -> F11 - 0, the circulation pump is switched off as soon as the storage
tank charging pump is activated. The circulation pump returns to operate according to the
time schedule when the storage tank charging pump has been switched off again.
Function
WE Configuration
Circulation pump operation
during storage tank charging
0 CO4 -> F11
6.8 Priority operation
In many district heating systems with primary DHW heating, the allotted amount of water
cannot meet DHW heating and heating operation demands when they are required at the
same time. As a result, the capacity required for DHW heating needs to be taken from the
heating system when great heating loads occur; and this, until DHW heating has been con-
cluded.
Nevertheless, heating operation is not to be interrupted simply. Only the amount of energy
required for DHW heating is to be deducted. This can be achieved by using the priority func-
tions Reverse control and Set-back operation.
6.8.1 Reverse control
In all systems with DHW heating and at least one heating circuit with control valve, DHW
heating can be given priority by applying reverse control. With the setting CO4 -> F08 - 1,
the charging temperature can be monitored in the DHW circuit.
In systems without the sensor VFx in the DHW circuit (e.g. Anl 4.5, 11.0, 12.0, 13.0, 21.0),
the temperature directly at the storage tank sensor SF1 is monitored. If system deviations still
occur after the time for
Activate priority in case of deviation
has elapsed, the set point of the
heating circuit or supplementary heating circuit – with several possibilities Rk3/Y3 – is grad-
ually reduced each minute until the flow temperature set point has reached 5 °C at the mini-
mum. How strongly the controller responds is determined by the
Correction factor
.
Functions
WE Configuration
Priority through reverse control 0
2 min
1.0
CO4 -> F08 - 1
Activate priority in case of deviation / 2 to 10 min
Correction factor / 0.1 to 10.0
Priority through set-back operation 0 CO4 -> F09 - 0
EB 5579 EN 91
Functions of the DHW circuit
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