102
EQJW146F002 EN
Functions of the DHW circuit
7.6 Parallel pump operation
This function can only be activated in systems Anl 2.1 to 2.1, 4.1 and 4.5.
When CO4 > F06 - 1, the circulation pump UP1 remains activated during DHW heating.
This does not include operating situations during which the current flow temperature demand
of the pump circuit is lower than the adjusted 'Temperature limit'. In this case, the controller
applies priority operation, if necessary with intermediate heating. Once a parallel pump op-
eration cycle has been activated and the time period set in 'Stop' has elapsed, system devia-
tions greater than 5 °C cause the controller to suspend parallel operation for 10 minutes and
to apply priority operation.
Setting 'Stop' to 0 min leads to a parallel operation once initiated remaining regardless of a
deviation.
Functions
WE
Configuration
Parallel pump operation
0
10 min
40.0 °C
CO4 > F06 - 1
Stop: 0 to 10 min
Temperature limit: 20.0 to 90.0 °C
7.7 Circulation pump during storage tank charging
With the setting CO4 > F11 - 1, the circulation pump (DHW) 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 starts to operate again according to the time schedule when
the storage tank charging pump has been switched off again.
Functions
WE
Configuration
Operation of circulation pump (DHW)
during storage tank charging
0
CO4 > F11
7.8 Priority position
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 demand 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 pri-
ority functions: reverse control and set-back operation.
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