Temperature-Time Integral - Siemens RVA63.242 User Manual

Description
Diagram
158/218
Siemens Building Technologies
Landis & Staefa Division

5.9.3 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
a to b
b to c and
d to e
c to d and
e to f
TK
TKx
SDK/2
TKmin
y
x%
0%
a
T K Boiler temperature
TKx Actual value of boiler temperature
Tkmin Minimum limitation of the boiler temperature
SDK Boiler switching differential (factory setting = 8K)
t Time
Y Locking signal
Basic Documentation RVA63.242, RVA53.242
Description of OEM settings
Procedure
Within a foreseeable period of time, the actual boiler
temperature (TKx) will lie below the value of Tkmin-
SDK/2.
è
Locking signal will be built up
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
Locking signal will remain at a constant level
Within a foreseeable period of time, the actual boiler return
temperature (TKx) will lie above TKw.
è
Locking signal will be decreased
b c d e
t
t
f
CE1P2373E
26.03.2001