Optimum Start / Stop Control - Siemens Synco700 RMK770 Documentation Handbook

Room model
Settings
Optimum start control
With room model
Settings
Optimum stop control
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Building Technologies
HVAC Products
Based on the outside temperature, the building time constant and the rate of room
temperature increase, the room model calculates the room temperature.
If no room temperature sensor is connected, the optimization functions can work with
this room model.
TR
Cmf
TRw
Economy
T Room model temperature
RM
TRw Room temperature setpoint
In the case of sudden positive increases of the room temperature setpoint, the room
model temperature will be updated at the rate of room temperature increase. In the
case of sudden negative drops, the room model temperature will approach the compos-
ite outside temperature at 3 times the building time constant, whereby the process is
stopped as soon as the current room temperature setpoint is reached.
Main menu > Settings > Heating circuit > Optimizations/influences
Operating line
Type of optimization
10.8.2

Optimum start / stop control

The purpose of optimum start control is to reach a temperature level 0.25 K below the
Comfort or Precomfort setpoint when occupancy according to the time program starts.
For that, the heating circuit must be switched on at an earlier point in time.
If a room temperature sensor is connected, the controller calculates the forward shift
depending on the current room temperature. Also, the controller learns the necessary
heating up time per K room temperature.
After the required room temperature is reached, the time differential to the entered time
will be determined. Based on the deviation ascertained, the controller can readjust the
heating up time per K room temperature and calculate the next forward shift with this
new value.
If no room temperature sensor is connected, or when the room model shall be used, the
rate of room temperature increase (duration in min/K) can be set.
The maximum forward shift can also be set. When entering 0 hours as the maximum
heating up time, optimum start control will be deactivated.
Main menu > Settings > Heating circuit > Optimizations/influences
Operating line
Forward shift on max
Room temperature rise
Optimum stop control switches the heating circuit off at the earliest possible point in
time so that, when the time switch changes from Comfort
Boiler Sequence Controller RMK770
10 Heating circuit control
TRM
Range
With room model / With
room temp sensor
Range
0...48 h
1...600 min/K
t
Factory setting
With room model
Factory setting
0 h
60 min/K
or Precomfort to Econ-
CE1P3132en
01.03.2005