Siemens RVA63.242 - Temperature-Time Integral

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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of OEM settings 26.03.2001
5.20.3 Temperature-time integral
This temperature-time integral generates the locking signal for restricting the heating
circuits.
When generating the locking signal, different procedures are used:
Diagram Procedure
a to b Within a foreseeable period of time, the actual boiler return temperature
(TKRx) will lie below TKRmin.
è Locking signal will be built up
b to c,
d to e
Within a foreseeable period of time, the actual boiler return temperature
(TKRx) will lie within the switching differential (SD).
è Locking signal will remain at a constant level
c to d,
e to f
Within a foreseeable period of time, the actual boiler return temperature
(TKRx) will lie above the level of TKRmin+SD.
è Locking signal will be decreased
2378Z12
t
a
b
0% t
y
x%
c
d
e
f
TKRx
TKR
TKRmin
SD
TKR Return temperature
TKRx Actual boiler return temperature
TKRmin Minimum limitation of boiler return temperature
SD Switching differential fixed = 2 K
t Time
Y Locking signal
Diagram