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Siemens Switzerland Ltd User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
Frost protection for the heating circuit
Frost protection for the heating circuit is always enabled and cannot be deactivated.
If, during a valid cooling request, the flow temperature falls below 5 °C, the heating
circuits are switched off. The pumps are activated again when the flow temperature
exceeds 7 °C and a fixed locking time of 5 minutes has elapsed.
During the period of time frost protection in cooling mode is active, neither a cooling nor
a heating request is delivered to the source.
6.8 DHW
Summary
B3
B31
Q3
The RVS61.843 controls the DHW temperature according to the
time program, or constantly to the relevant setpoint. Priority of
DHW charging over space heating can be selected.
The controller features a legionella function with a number of
setting choices, fighting legionella viruses both in the storage
tank and in the circulation pipe. The circulating pump is controlled
according to the selectable time program and the operating
mode.
Setpoints
Line no. Operating line
1610 Nominal setpoint
1612 Reduced setpoint
The DHW is controlled according to different setpoints. These setpoints are activated
depending on the selected operating mode, thus leading to the required temperature
level in the DHW storage tank.
TWWR Reduced DHW setpoint
TWWN Nominal DHW setpoint
TWWmax Nominal DHW setpoint maximum
Frost protection for the
heating circuit in cooling
mode
0 10 20 30 40 50 60 70 80 90 100 °C
2358Z11
TWWR
TWWN
TWWmax
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