Generation Of The Boiler Temperature Setpoint - Siemens Albatros Rva63.242 Basisdokumentation

Benefits
Description
Process
Exception
Effect
Example
Siemens
Building Technologies
6.1

Generation of the boiler temperature setpoint

• Demand-dependent control of the burner
Depending on the temperature situation, the various heating circuits call for different
flow temperature setpoints as demanded by boiler temperature control. However, since
boiler temperature control can consider only one setpoint, a selection is made.
Generally, the request for the highest setpoint required by a consumer (e.g. by a
heating circuit) generates the current boiler temperature setpoint.
The setpoint requirements considered stem from both controller-internal setpoints and
setpoints transmitted via LPB.
Auxiliary functions, such as setpoint boosts and the like, are included in the setpoints
actually demanded at the time.
A request for DHW has priority over all other setpoint requirements, which means that
the required DHW setpoint is maintained, even if it is lower than that called for by a
heating circuit.
The boiler temperature is maintained at the highest setpoint currently demanded –
unless there is a request for DHW.
T
°C
90
80
70
60
50
TV
40
30
20
20 10
TKw Boiler temperature setpoint
TVw1 Flow temperature setpoint of heating circuit 1 (incl. setpoint boost if any)
TVw2 Flow temperature setpoint of heating circuit 2 (incl. setpoint boost if any)
Basic documentation RVA63.242, RVA53.242, RVA66.540
General control processes
TK
w
w1
0 -10 -20
TV
w2
-30
TA
gem
197/236
CE1P2373E
23.3.2009