Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 9 Heating circuit control 2017-09-29
The room limitation increase is used to set the temperature differential for switching off
the heating circuit.
The room limitation switching differential is used to set the temperature differential for
switching on the heating circuit.
9.8.2 Limitation of the return temperature
The heating circuit’s mixing valve can be used to provide maximum limitation of the
return temperature. Minimum limitation is not supported. By contrast, the boiler
supports minimum limitation with certain restrictions for all consumers. For more
detailed information, refer to subsection 9.8.3 "Minimum limitation of the return
temperature".
3133S77
Y1
B1
M1
B7
Y1
B1
M1
B7
3133S79
Main controller
Primary controller
B1
Flow temperature sensor
B7
Return temperature sensor
M1
Heating circuit pump
Y1
Heating circuit mixing valve
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
Room limitation increase
Room lim switching
differential
Extra configuration
Settings
Maximum limitation
Special cases