Siemens RVA63.242 - Page 122

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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of heating engineer settings 26.03.2001
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,
d to e
Within a foreseeable period of time, the actual boiler temperature (TKx)
will lie within half the switching differential of the boiler temperature
setpoint.
è Locking signal will remain at a constant level
c to d,
e to f
Within a foreseeable period of time, the actual boiler temperature (TKx)
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 %.
TKx
2378Z11
t
a
b
TK
TKw
0% t
y
x%
c
d
e
f
SDK/2
a Start of d.h.w. heating
TK boiler temperature
TKw Boiler temperature setpoint
TKx Actual value of the boiler temperature
SDK Switching differential of the boiler
t Time
Y Locking signal
Diagram