User Manual

Main menu > Commissioning > Communication > Distribution zones >
Setting values
Operating line Range Factory setting
Heat distribution zone 1…31 1
Main menu > Commissioning > Settings > .... or
Main menu > Settings > Aggregates > Heat demand >
Operating line Range Factory setting
Limit value request on 0...100 % 10 %
Limit value request off 0...100 % 5 %
Heating flow setpoint 0...140 °C 40 °C
Flow temperature reduction
max
0...100 K 0 K
Control action Slow, Medium, Fast Medium
Request evaluation Average, Maximum Maximum
This adjustable value prevents entire plants from being switched on (e.g. heat
generation plants) in the case of low heat requests. Switching on (i.e. routing as a
bus signal or to outputs Q, d, Y, a) takes place only when the set value "Limit value
request on" is exceeded.
Limit value re
quest on
[%]
On
Heatin
g flow setpoint,
Flow temperature
reduction max
Use setting v
alue "Flow temperature reduction max" to enable optimization, which
determines the current optimum flow temperature for control from the received
request signals.
In this case, value "Flow temperature reduction max" can be floating, i.e. deviate
from the set value for "Heating flow setpoint".
This current flow temperature is controlled to a 90% valve position of the heat
consumer with the greatest demand (evaluation of request in setting "Maximum")
so that:
 Valve position < 90 %: The flow temperature is reduced continuously until value
"Heating flow setpoint" minus "Flow temperature reduction max" is reached.
 Valve position > 90 %: The flow temperature is increased continuously until
value "Heating flow setpoint" is reached.
As a result, the following min. flow temperature setpoint can be set at valve
positions ≤ 90%:
Min. flow temperature = "Heating flow setpoint" - "Flow temperature reduction max"
This optimization function is enabled only if value "Flow temperature reduction
max" > 0 (factory setting: 0 = disabled).
Note
139 / 216
Siemens Switching and monitoring device RMS705B CE1P3124en
Building Technologies H/C demand, H/C changeover 01.04.2010