Siemens AVS75.39 Series User Manual page 131

Operation action of return
diversion
Partial charging
Configuration
Auxiliary function QX.. (line 5890 - 5895): Return diverting valve Y15 in the buffer storage tank
Sensor input BX.. (line 5930 - 5932):
Siemens
Building Technologies
Temperature setback
If the return temperature from the consumers is higher than the temperature at the
selected sensor (line 4795), the return can be used to preheat the lower part of the
storage tank. As a result, the return temperature continues to drop which, in the
case of a condensing boiler, leads to higher efficiency.
Temperature boost
If the return temperature from the consumers is lower than the temperature at the
selected sensor (line 4795), the return can be preheated by diverting it via the
lower part of the storage tank. It is thus possible to preheat the return.
Line no. Operating line
4800 Partial charging setpoint
Due to the hydraulic decoupling of the lower part of the buffer storage tank, the
storage tank volume that can be heated up will be reduced. The upper part of the
storage tank will therefore be heated quicker. The lower section of the storage is
heating first, of the upper part is charged.
As soon as temperature measured at the temperature sensor (B4/B42) reaches the
partial charge setpoint, the changeover valve switches to "through" and the rest of
the storage tank is also charged.
It calculates a switching differential of ¼ °C for the release.
It is charges to the slave pointer value if the slave pointer is higher than the set
partial charging load.
B4/B42
1
0
User manual RVS43.345
The settings in detail
Buffer storage tank sensor B4 or B42.
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CE1U2354en_021
2013-09-02