Siemens Synco 700 - Page 106

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Building Technologies Modular Heating Controller RMH760B CE1P3133en
HVAC Products 8 Main controller and primary controller 05.02.2007
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,
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 out-
side 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 tem-
perature. Outside temperature is irrele-
vant
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 tempera-
ture is irrelevant
Return temperature curvepoint 2 = ---- Constant return temperature limitation
with curvepoint 1 as the maximum return
temperature setpoint. Outside tempera-
ture is irrelevant
Return temperature curvepoint 1 and
return temperature curvepoint 2 = ----
In space heating mode, limitation of the
return temperature is deactivated
This limitation is effective when DHW heating is active at the primary controller. In that
case, maximum limitation in space heating mode will be deactivated.
Maximum limitation in DHW heating mode is constant, that is, independent of the
outside temperature.
The limitation can be overridden by maximum limitation in DHW heating mode with the
legionella function activated. For more detailed information, refer to the next section.
Maximum limitation of
the return temperature
Maximum limitation in
space heating mode
Special cases:
Maximum limitation in
DHW heating mode