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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
If solar output is sufficient and solar charging pumps are used, parallel operation is
possible. In that case, the storage tank of the priority model can be the next to be
charged at the same time, in addition to the storage tank to be charged next. Parallel
operation can be delayed by introducing a waiting time. This way, in the case of parallel
operation, switching on of the storage tanks can be effected in steps.
Setting (---) disables parallel operation.
To remove any existing cold water from the primary circuit, operation of the secondary
pump of the external heat exchanger can be delayed.
Start function
Line no. Operating line
3831 Min run time collector pump
3834 Gradient collector start funct
The function activates periodically the collector pump for at least the selected minimum
running time.
When the temperature at the collector sensor rises, the collector pump is activated.
Frost protection for the collector
Line no. Operating line
3840 Collector frost protection
When there is risk of frost at the collector, the collector pump is activated to prevent the
heat-carrying medium from freezing.
• If the collector temperature falls below the frost protection temperature, the
collector pump is activated: TKol < TKolFrost.
• When the collector temperature returns to a level of 1 K above the frost protection
temperature, the collector pump is deactivated again: TKol > TKolFrost + 1.
Overtemperature protection for the collector
Line no. Operating line
3850 Collector overtemp protection
If there is a risk of overtemperature at the collector, storage tank charging is continued
to reduce the amount of excess heat. When the storage tank’s safety temperature is
reached, charging is stopped.
Waiting time parallel op
Delay secondary pump
Min run time collector
pump
Collector start funct
gradient
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