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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
The temperature differential at an outside temperature of -10 °C that is entered on this
operating line is transformed to the current composite outside temperature.
At an outside temperature of -10 °C, the flow temperature setpoint is reduced by the set
value, and there is no more reduction at an outside temperature of 20 °C.
T
TRL
Ta
20°C
TVL
-10°C
5801
TVL Flow temperature
tRL Return temperature
Ta Outside temperature (OT)
Important!
Instead of entering the correct temperature differential at -10 °C, it is also possible to
enter 0 as the temperature differential. In that case, the heating curve must be set for
the return temperature setpoint. But this choice only exists for plants without mixing
heating circuit.
Parameter 5810 is active only if there is no buffer storage tank.
In cooling mode, the parameter has no impact. In the case of return temperature
control, the cooling curve must be based on the return temperature setpoint.
Solar
Line no. Operating line
5840 Solar controlling element
Charging pump
Diverting valve
5841 External solar exchanger
Jointly
DHW storage tank
Buffer
In place of a collector pump and diverting valves for integrating the storage tanks, the
solar plant can also be operated with charging pumps.
When using a diverting valve, it is always only one heat exchanger that can be used at
a time. Only alternative operation is possible.
When using a charging pump, all heat exchangers can be used at the same time.
Either parallel or alternative operation is possible.
In the case of solar plants with 2 storage tanks, it must be selected whether the
external heat exchanger shall be used for DHW and as a buffer storage tank, or
exclusively for one of the two.
Solar controlling element
External solar exchanger
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