Siemens RVA63.280 - Temperature-Time Integral

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Siemens Building Technologies Basic Dokumentation RVA63.280, RVA53.280 CE1P2374E
Landis & Staefa Division 19.04.2001
3.9.3 Temperature-time integral
The temperature-time integral generates the locking signal for restricting the heating
circuits.
During the generation of the locking signal, the following processes can take place:
Diagram Procedure
a to b Within a foreseeable period of time, the actual boiler temperature (TKx)
will lie below the value of Tkmin-SDK/2.
è
èè
è Locking signal will be built up
btocand
dtoe
Within a foreseeable period of time, the actual boiler return temperature
(TKx) will lie within half the switching differential of the boiler return
temperature's minimum limitation.
è
èè
è Locking signal will remain at a constant level
c to d and
etof
Within a foreseeable period of time, the actual boiler return temperature
(TKx) will lie above TKw.
è
èè
è Locking signal will be decreased
2378Z13
t
a b
0%
t
y
x%
cd ef
TKx
TK
TKmin
SDK/2
TK boiler temperature
TKx Actual value of boiler temperature
Tkmin Minimum limitation of boiler temperature
SDK Boiler switching differential (factory setting = 8K)
tTime
Y Locking signal
Description
Diagram