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.
Frost protection for the
heating circuit in cooling
mode
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 Domestic hot water
Overview
B3
B31
Q3
The unit 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.
0
10
20
30
40
50
60
70
80
90
100
°C
235
8
Z
11
TWWR
TWWN
TWWmax
TWWR
Reduced DHW setpoint
TWWN
Nominal DHW setpoint
TWWmax Nominal DHW setpoint maximum
105/258
Siemens Switzerland Ltd
User manual RVS61.843, RVS41.813
CE1U2355en_02
HVAC Products
6 The settings in detail
28. September 2009