Siemens Synco 700 Series - Page 174

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Building Technologies Boiler Sequence Controller RMK770 CE1P3132en
HVAC Products 10 Heating circuit control 23.04.2009
Main menu > Commissioning > Settings > … or
Main menu > Settings > Heating circuit > Limitations
Operating line Range Factory setting
[Curvepoint 1] outside temp –50…50 °C –11 °C
[Curvepoint 1] return temp ---- / 0…140 °C ----°C
[Curvepoint 2] outside temp –50…50 °C 15 °C
[Curvepoint 2] return temp ---- / 0…140 °C ----°C
The maximum limit value of the return temperature is either constant or changes de-
pending on the outside temperature. Limitation is activated if the setting of at least 1
maximum return temperature setpoint is valid.
TOeff
TRtLim
TrtLim Limit value of return temperature limitation
Toeff Composite (effectively acting) outside temperature
Curvepoint 1 Maximum return temperature limit value (effective at low outside temperatures)
Curvepoint 2 Minimum return temperature limit value (effective at high outside temperatures
Setting Effect
[Curvepoint 1] return temp =
[Curvepoint 2] return temp
Constant return temperature limitation.
The outside temperature is irrelevant
[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 setpoint of
the return temperature. The outside
temperature is irrelevant
[Curvepoint 2] return temp = --- Constant return temperature limitation
with [Curvepoint 1] maximum setpoint of
the return temperature. The outside
temperature is irrelevant
[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 flow temperature setpoint of the
primary controller is reduced. When the return temperature returns to a level below the
limit value, reduction of the flow temperature setpoint is decreased again.
Limitation is provided in the form of an I-controller; the integral action time is adjustable.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Heating circuit > Mixing circuit controller
Operating line Range Factory setting
[Tn] return temp limitation max 0…60 min 30 min
Settings
Maximum limitation
Special cases