Siemens RVA63.242 User Manual page 122

Diagram
122/218
Siemens Building Technologies
Landis & Staefa Division
4.56.3 Temperature-time integral
This temperature-time integral generates the locking signal for restricting the heating
circuits.
Diagram Procedure
a to b Within a foreseeable period of time, the actual boiler temperature (TKx)
will not lie within half the switching differential of the boiler temperature
setpoint.
è
Locking signal will be built up
b to c, Within a foreseeable period of time, the actual boiler temperature (TKx)
will lie within half the switching differential of the boiler temperature
d to e
setpoint.
è
Locking signal will remain at a constant level
c to d, Within a foreseeable period of time, the actual boiler temperature (TKx)
e to f will lie above TKw.
è
Locking signal will be decreased
f The actual boiler temperature (TKx) exceeds the boiler temperature
setpoint.
è
Locking signal will be set to 0 %.
TK
SDK/2
TKw
TKx
y
x%
0%
a
a Start of d.h.w. heating
T K boiler temperature
TKw Boiler temperature setpoint
TKx Actual value of the boiler temperature
SDK Switching differential of the boiler
t Time
Y Locking signal
Basic Documentation RVA63.242, RVA53.242
Description of heating engineer settings
b c d e
t
t
f
CE1P2373E
26.03.2001