Siemens RVA63.242 - Temperature-Time Integral

158/218
Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of OEM settings 26.03.2001
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 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 Locking signal will be built up
b to c and
d to e
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
c to d and
e to f
Within a foreseeable period of time, the actual boiler return
temperature (TKx) will lie above TKw.
è Locking signal will be decreased
2378Z13
t
a
b
0% t
y
x%
c
d
e
f
TKx
TK
TKmin
SDK/2
TK 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
Description
Diagram