Operation Manual

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Siemens Schweiz AG User Manual CE1U2354en
HVAC Products DHW 23. August 2007
6.8 DHW
Setpoints
Line no. Operating line
1610 Nominal setpoint
1612 reduced setpoint
The DHW can be heated up according to different setpoints. These setpoints are
activated depending on the selected operating mode, thus leading to different
temperature levels in the DHW storage tank.
TWWR DHW reduced setpoint
TWWN DHW nominal setpoint
TWWmax DHW nominal setpoint maximum
Priority
Line no. Operating line
1630 Charging priority
Absolute
Shifting
None
MC shifting, PC absolute
When both space heating and DHW heating call for heat, the “DHW priority“ function
ensures that while DHW charging is in progress, the capacity of the boiler is used
primarily for DHW.
Absolute priority
The mixing and pump heating circuit stay locked until DHW heating is finished.
Shifting priority
If the capacity of the heat source is not sufficient, the mixing and pump heating circuit
will be restricted until DHW is heated up.
No priority
DHW heating and space heating take place at the same time.
In the case of tightly sized boilers and mixing heating circuits, it can happen that the
DHW setpoint will not be reached if space heating demands considerable amounts of
heat.
Mixing heating circuit shifting, pump heating circuit absolute
The pump heating circuits stay locked until the DHW storage tank is heated up. If the
capacity of the heat source is not sufficient, the mixing heating circuits will also be
restricted.
Legionella function
Line no. Operating line
1640 Legionella function
Off
Periodically
Fixed weekday
1641 Legionella funct periodically
0 10 20 30 40 50 60 70 80 90 100 °C
2358Z11
TWWR
TWWN
TWWmax