Siemens AVS75.39 Series User Manual page 151

DHW control element
DHW controlling element
Q3
Basic pos DHW div valve
Separate DHW circuit
Siemens
Building Technologies
Selection Operating line
5731 DHW ctrl elem Q3
None ¦ Charging pump ¦ Diverting valve
5734 Basic position DHW div valve
Last demand ¦ Heating circuit ¦ DHW
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.
Defines the basic position for the diverting valve at standstill:
Last demand
The diverting valve maintains the position assumed last.
Heating circuit
When there is no request for heat, the diverting valve assumes the "Heating circuit"
position.
DHW
When there is no request for heat, the diverting valve assumes the "DHW" position.
The function only works if the diverting valve was selected as DHW controlling
element (line 5731)
In the case of multiboiler plants (cascades), one of the boilers can temporarily be
used for DHW charging only. When DHW charging is activated, that boiler
disconnects itself hydraulically 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 boiler is again available for space heating,
which means that it informs the cascade about it.
Line no. Operating line
5736 DHW separate circuit
Off
The separate DHW circuit is off.
Every available generator can charge the DHW storage tank.
On
The separate DHW circuit is on.
DHW charging takes place exclusively via heat generation defined for that purpose.
User manual RVS43.345
The settings in detail
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CE1U2354en_021
2013-09-02