EB 5573 EN
83
Functions of the DHW circuit
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
Circulation pump operation during
storage tank charging
0
CO4 > F11
7.8
Priority circuit
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
.
The priority functions (reverse control and priority operation) can be activated for each heat-
ing circuit separately in system Anl 4.5.
HC1
HC2
HC1+HC2
7.8.1
Reverse control
In all systems with DHW heating and at least one heating circuit with a control valve, DHW
heating can be given priority by applying reverse control. With the setting CO4 > F08 - 1,
the temperature is monitored at sensor VFx.
In systems without sensor VFx in the DHW circuit (e.g. Anl 4.5, 11.0), the temperature is
monitored directly at storage tank sensor SF1. If system deviations still occur after the time set
in 'Activate priority in the event of a system deviation' has elapsed, the set point of the heat-
ing circuit with the control valve is gradually reduced each minute until the flow temperature
Summary of Contents for TROVIS 5573
Page 144: ...144 EB 5573 EN Key number 1732...
