Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Optimum start control (basic type A) 03.10.2011
22 Optimum start control (basic type A)
The optimum start control heats or cools the room to the desired room temperature
prior to the automatic changeover of the operating mode to Comfort. This applies
only to change over of operating mode to Comfort (e. g. from a switch
from Economy to Comfort).
The plant is then switched on, if the setpoint can still achieve the next subsequent
operating mode. The time switch can thus be set to actual room occupancy. This
significantly shortens actual plant operation since pre-cooling or pre-heating is
optimized.
22.1 Activate function
The function optimum start control can be activated in basic type A.
2 types of optimum start control are available:
1. "On: Values fix" (room temperature setback or rise)
2. "On: Values adapted" (automatic adaption of setting values)
For the second option, the controller automatically optimizes the setting values and
adapts them to the conditions of the given plant.
Main menu > Commissioning > Settings > .... or
Main menu > Settings > Optimum start control >
Operating line Range Factory setting
Optimum start control
Off, On: Values fix, On: Values
adapted
Off
Optimum start control uses the room temperature for calculations. Does not
support calculation using the extract air temperature.
When applying optimum start control it is recommended to use the "cascade"
control strategy. See section 11.2
22.2 Optimum start control for cooling and
heating
The required precooling or preheating period is calculated based on the present
room temperature and the set "Room temperature setback" or "Room temperature
rise". In other words, the new room temperature setpoint is already achieve at the
time of the change in operating mode.
Setting values
Note