Siemens Albatros2 RVA78.690 User Manual page 36

Temp diff ON / OFF
return diversion
Comparative temperature
return diversion
Operation action of return
diversion
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Siemens
Building Technologies
6.8.5 Plant hydraulics
Line no. Operating line
4783 With solar integration
Select here whether the buffer storage tank can be charged by solar energy.
6.8.6 Return diversion
Line no. Operating line
4790 Temp diff on return div
4791 Temp diff off return div
4795 Compar temp return div
B4 ¦ B41
4796 Optg action return diversion
Temperature setback
Temperature boost
At the corresponding temperature differential between the common return sensor
B73 and the selectable comparative temperature, the return is divered through the
lower part of the buffer storage tank. This function can be used to either raise or
lower the return temperature. It is defined in OL 4796.
In addition, set the corresponding relay output as "Buffer return valve Y15" in the
configuration relay output ZX1 (OL 5890) and the common return sensor B73 to
BX1, 2 or 3 (5930, 5931, 5932).
The set temperature differential determines the switch on/off point for return
diversion.
Select the buffer storage tank sensor for comparison with the return temperature to
switch return diversion based on the set temperature differential.
Reduce temperature
If the return temperature from the consumers is higher than the temperature at the
selected sensor (OL 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 increase
If the return temperature from the consumers is lower than the temperature at the
selected sensor (OL 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, for example.
Solar compact controller
The settings in detail
CE1U2396en
18.08.2010