Generation Of Boiler Temperature Setpoint - Siemens RVA63.280 Basic Documentation

Benefit
Description
Process
Exception
Effect
Example
Siemens Building Technologies
Landis & Staefa Division
4.1

Generation of 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 demand 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 demand for d.h.w. has priority over all other setpoint requirements, which means that
the required d.h.w. setpoint will be 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 d.h.w. is required.
T
°C
90
80
70
60
50
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 Dokumentation RVA63.280, RVA53.280
TK
w
TV
w1
0 -10
TV
w2
-20 -30
TA
gem
163/184
CE1P2374E
19.04.2001