Siemens Synco 700 - Page 136

136/238
Building Technologies Modular Heating Controller RMH760B CE1P3133en
HVAC Products 9 Heating circuit control 05.02.2007
The function is to be activated via “Extra configuration“:
… > Heating circuit 1 (or 2 or 3) > Inputs > Return sensor
Main menu > Commissioning > Settings > … or
Main menu > Settings > Heating circuit 1 (or 2 or 3) > Limitations
Operating line Range Factory setting
[Curvepoint 1] outside temp –50…50 °C –20 °C
[Curvepoint 1] flow temp ---- / 0…140 °C ---- °C
[Curvepoint 2] outside temp –50…50 °C 10 °C
[Curvepoint 2] flow temp ---- / 0…140 °C ---- °C
The return temperature limit value is either fixed or it changes as a function of the
outside temperature. Limitation will be activated when at least one valid maximum
return temperature limit is set.
3133D02
TOeff
TRtLim
[Curvepoint 1]
Return temperature
[Curvepoint 2]
Return temperature
[Curvepoint 1]
Outside temperature
[Curvepoint 2]
Outside temperature
TRtLim
Limit value of return temperature limitation
TOeff
Composite (effectively acting) outside temperature
Curvepoint 1 Maximum return temperature limit value, active at low outside temperatures
Curvepoint 2 Minimum return temperature limit value, active at high outside temperatures
Setting Effect
[Curvepoint 1] return temp =
[Curvepoint 2] return temp
Constant return temperature limitation.
The outside temperature is of no impor-
tance
[Curvepoint 1] outside temp =
[Curvepoint 2] outside temp
Return temperature limit value, changes
abruptly at the curvepoints
[Curvepoint 1] return temp = --- Constant return temperature limitation
with [curvepoint 2] maximum return
temperature limit value. The outside
temperature is of no importance.
[Curvepoint 2] return temp = --- Constant return temperature limitation
with [curvepoint 1] maximum return
temperature limit value. The outside
temperature is of no importance
[Curvepoint 1] return temp and [Curve-
point 2] return temp = ---
Return temperature limitation is deacti-
vated
If the return temperature exceeds the limit value, the primary controller’s flow tempera-
ture setpoint will be lowered. If the return temperature drops below the limit value, the
reduction of the flow temperature setpoint will be negated again.
Limitation works as an I-controller whose integral action time can be adjusted.
Extra configuration
Settings
Maximum limitation
Special cases