Charging Priority; Legionella Function - Siemens RVS41.813 User Manual

Charging priority

Legionella function

Siemens Switzerland Ltd
HVAC Products
Line no. Operating line
1630 Charging priority
Absolute
Shifting
None
M C 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 circuit stay locked until DHW heating is finished.
Shifting priority
Mixing and pump heating circuit is restricted until DHW is heated up if the capacity
of the heat source is not sufficient Demand to HP fix is raised by 6 K (DHW setpoint
+ 6K) to ensure a high enough temperature is available for DHW and in order to end
it as well. Does not apply to separate DHW circuit.
No priority
DHW heating 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 the condenser pump Q9.
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
User manual RVS61.843, RVS41.813
6 The settings in detail
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CE1U2355en_02
28. September 2009