Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 8 Main controller and primary controller 2017-09-29
Main menu > Commissioning > Settings > … or
Main menu > Settings > Main controller > Limitations
Main menu > Settings > Primary controller > Limitations
Operating line
Range
Factory setting
[Curvepoint 1] outside temp
–50…50 °C
–20 °C
[Curvepoint 1] return temp
---- / 0…140 °C
---- °C
[Curvepoint 2] outside temp
–50…50 °C
10 °C
[Curvepoint 2] return temp
---- / 0…140 °C
---- °C
DHW return temp max
---- / 0…140 °C
---- °C
Legionella return temp max
---- / 0…140 °C
---- °C
If the return temperature exceeds the limit value, the primary controller’s flow
temperature setpoint will be lowered. If the return temperature drops below the limit
value, reduction of the flow temperature setpoint will be negated again. Limitation is
provided in the form of an I-controller whose integral action time can be adjusted.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Main controller > Mixing circuit controller
Main menu > Settings > Primary controller > Mixing circuit controller
Operating line
Area
Factory setting
[Tn] return temp limitation max
0…60 min
30 min
Maximum limitation will be effective when only heating and ventilation are active at the
respective primary controller. It will be deactivated as soon as DHW heating is started.
With this limitation, the return temperature limit value changes depending on the
outside temperature. Maximum limitation will be activated when a valid value is set for
at least one maximum return temperature setpoint.
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
Return temperature curvepoint 1 =
return temperature curvepoint 2
Constant limitation of the return
temperature. Outside temperature is
irrelevant
Outside temperature curvepoint 1 =
outside temperature curvepoint 2
Limit value of return temperature
changes abruptly at the curvepoints
Return temperature curvepoint 1 = ---- Constant return temperature limitation
with curvepoint 2 as the maximum return
temperature setpoint. Outside
temperature is irrelevant
Settings
Maximum limitation of
the return temperature
Maximum limitation in
space heating mode
Special cases: