Siemens Synco 700 Series - Limitation of the Return Temperature

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Building Technologies Boiler sequence controller RMK770 CE1P3132en
HVAC Products 9 Precontrol 23.04.2009
Main menu > Commissioning > Settings > … or
Main menu > Settings > Primary controller > Limitations
Operating line Range Factory setting
Flow temperature max 0…140 °C 140 °C
Flow temperature min
---- / 0…140 °C
---- °C
Flow temperature rise max ---- / 1…600 K/h
---- K/h
System pump locking signal
Off / On Off
Frost protection for the plant Off / On
Off
9.8.3 Limitation of the return temperature
The primary controller provides maximum limitation of the return temperature depend-
ing on the number of consumers drawing heat. The following limitations are available:
• Maximum limitation during heating mode
• Maximum limitation during DHW heating
For both types of limitation, following applies:
• A return temperature sensor must be configured
• Limitation of the return temperature is possible only with primary controller type 1
Maximum limitation of the return temperature with primary
controller type 1:
Y1
B1
M1
B7
3133S76
Minimum limitation of the return temperature is not supported.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Primary controller > 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
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 flow temperature setpoint of the
primary controller is lowered. When the return temperature returns to a level below the
limit value, the reduction of the flow temperature setpoint is negated again. Limitation is
provided in the form of I-control with an adjustable integral action time.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Primary controller > Mixing circuit controller
Operating line Range Factory setting
[Tn] return temp limitation max 0…60 min 30 min
This limitation becomes active only when the respective primary controller needs to
provide heat for heating or ventilation plant. It is deactivated as soon as DHW heating is
switched on.
With this type of limitation, the level of return temperature limitation changes as a
function of the outside temperature. The limitation is activated when a valid value is set
for at least 1 maximum setpoint of the return temperature.
Settings
Return sensor
Note
Settings
Maximum limitation of
the return temperature
Maximum limitation
during heating mode