Temperature-Time Integral - Siemens RVA63.242 User Manual

Diagram
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Siemens Building Technologies
Landis & Staefa Division

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, Within a foreseeable period of time, the actual boiler return temperature
d to e (TKRx) will lie within the switching differential (SD).
è
Locking signal will remain at a constant level
c to d, Within a foreseeable period of time, the actual boiler return temperature
e to f (TKRx) will lie above the level of TKRmin+SD.
è
Locking signal will be decreased
TKR
TKRx
SD
TKRmin
y
x%
0%
a
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
Basic Documentation RVA63.242, RVA53.242
Description of OEM settings
b c d e
t
t
f
CE1P2373E
26.03.2001