Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 10 DHW heating 2017-09-29
3133S86
CiPu
Consumer control always consists of mixing valve and consumer flow temperature
sensor.
The circulating pump is an optional plant component, but recommended.
When there is no flow of water, the mixing valve can fully open, which can lead to high
outlet temperatures once the flow starts again.
Consumer control is to be activated via "Extra configuration":
… > DHW… > Inputs > Flow sensor consumers Assign terminal
… > DHW… > Outputs > Consumer mixing valve 3-pos Assign terminal
… > DHW… > Outputs > Consumer mixing valve mod Assign terminal
To be able to match the control parameters to the type of plant (actuator and controlled
system), the parameters of the PID controller can be set. They apply to both 3-position
and DC 0…10 V actuators.
Main menu > Commissioning > Settings > … or
Main menu > Settings > DHW > Controller consumers
Operating line
Range
Factory setting
Actuator run time
1…600 s
35 s
P-band Xp
1…100 K
50 K
Integral action time Tn
0…600 s
60 s
Derivative action time Tv
0…30 s
0 s
The operating mode is only dependent on the time switch of the circulating pump,
whereby operating mode "Normal" applies during "On", and operating mode "Reduced"
during "Off".
The operating mode of consumer control indicates the setpoint at which the consumer
temperature is maintained.
Consumer control only uses the 2 setpoints "Normal" and "Reduced".
On the service level, it is also possible to set a setpoint reduction against the general
legionella setpoint. The legionella setpoint of consumer control is calculated as follows:
Legionella setpoint – Legionella setpoint reduction
Main menu > DHW > Setpoints consumers > … or
Main menu > Settings > DHW > Setpoints consumers
Operating line
Range
Factory setting
Legionella setpoint reduction
0…20 K
2 K
Normal setpoint
5…140 °C
55 °C
Reduced setpoint
5…140 °C
40 °C
Legionella protection of consumer control requires the circulating pump to be running.
This can be a pump controlled by the controller or an external pump. In the case of an
external pump, the following setting is required:
Main menu > Commissioning > Settings > … or
Main menu > Settings > DHW > DHW > External circulating pump
The setting to be made is "Yes".
The user must ensure that the external pump is in operation during the time the
legionella function is performed.
Extra configuration
Settings
Operating mode
Setpoints
Legionella protection