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Siemens Switzerland Ltd User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
Charging priority
Line no. Operating line
1630 Charging priority
Absolute
Shifting
None
MC shifting, PC absolute
When both space and DHW demand heat, the “DHW priority“ function ensures that
during DHW charging the heat source’s capacity is used primarily for DHW heating.
Absolute priority
The mixing and pump heating circuits are locked until the DHW has reached the
required temperature level.
Shifting priority
If the capacity of the heat source is no longer sufficient, the mixing and pump
heating circuits are restricted until the DHW has reached the required temperature
level.
No priority
DHW charging and space heating take place at the same time.
In the case of tightly sized heat sources and mixing heating circuits, the DHW
setpoint might not be reached if space heating calls for 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.
Plants without buffer or combi storage tanks: Parameter “Charging priority“ should be
set to “Absolute“, ensuring that the consumers will be switched off. If this is not
observed, the required DHW temperature might not be reached.
Plants with buffer or combi storage tanks: Parameter “Charging priority“ should be set
to “None“. If this is not observed, the heating circuits of plants using storage tanks will
be unnecessarily restricted.
Parameter “Charging priority“ has no impact on condenser pump Q9.
Legionella function
Line no. Operating line
1640 Legionella function
Off
Periodically
Fixed weekday
1641 Legionella funct periodically
1642 Legionella funct weekday
Monday…Sunday
1644 Legionella func time
1645 Legionella func setpoint
1646 Legionella funct duration
1647 Legionella funct circ pump
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