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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
Using this setting, heating circuit 2 can be switched on and off.
DHW controlling element Q3
Setting Operating line
5731 DHW control element Q3
None ¦ Charging pump ¦ Diverting valve
None
No DHW charging via Q3.
Charging pump
The DHW is heated up with a pump connected to terminals Q3/Y3.
Diverting valve
The DHW is heated up with a diverting valve connected to terminals Q3/Y3.
Separate DHW circuit
In the case of multiboiler plants (cascades), one of the heat sources can temporarily be
used for DHW charging only. When DHW charging is activated, the respective heat
source hydraulically decouples itself from the system by means of the so-called
separate circuit and is not available for space heating during that period of time. On
completion of DHW charging, the heat source is again available for space heating,
which means that it informs the cascade about it.
When the separate circuit is activated with the RVS61.843, condenser pump Q9 is
deactivated when parameter “DHW control element” (5731) is set to "Charging pump”.
The plant diagram below shows a possible application of this function.
This type of plant can also be implemented without using system pump Q14.
2358h13
B3
Q3
Q9
B21
K1/E11
B71
B92
Q8/E14
B91
E15
E9
PP
B81
E10
B83
B4
B41
B9
Y1/Y2
Q2
B1
A6
Line no. Operating line
5736 Separate circuit
OFF
The separate circuit is switched off. Every available heat source can charge the DHW
storage tank
Heating circuit 2
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