Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 10 DHW heating 2017-09-29
The output is to be activated via "Extra configuration":
Main menu > Commissioning > Extra configuration > DHW > Outputs > Legionella function
relay Assign terminal
There are no settings required.
10.7 Primary control
With plant types DHW 1 and DHW 5, the charging temperature is not controlled. But it
can be indirectly influenced by appropriate selection of DHW priority or by the
temperature request.
Charging is effected through control of the secondary pump or primary pump based on
the storage tank temperature.
The other plant types are also controlled via the storage tank temperature but, in
addition, the secondary temperature or the primary flow temperature will be controlled.
With plant type DHW 6, primary control is always enabled while the secondary flow
temperature is controlled.
With plant types DHW 2 and DHW 4, control is accomplished via a mixing valve, with
plant types DHW 3 and DHW 6 via a 2-port valve.
The setpoint for primary control is dependent on the operating mode and, according to
plant type, on the respective setpoint increase.
Control can be effected with a 3-position or DC 0…10 V actuator. The type of actuator
is to be selected via "Extra configuration".
The following settings apply to both the 3-position and the DC 0…10 V actuator.
Main menu > Commissioning > Settings > … or
Main menu > Settings > DHW > Controller primary circuit
Operating line
Range
Factory setting
Actuator running time
1…600 s
150 s
P-band Xp
1…100 K
50 K
Integral action time Tn
0…600 s
60 s
10.7.1 Primary temperature setpoint
To be able to bring the DHW storage tank to the required setpoint or, in the case of
direct DHW heating, to the required continuous flow temperature, heat generation and
transmission and, sometimes, primary control, require a setpoint increase.
The following setpoint increase can be set on the service level depending on the
selected plant type.
Main menu > Settings > DHW > Controller primary circuit
Operating line
Range
Factory setting
Setp increase DHW charging
0…50 K
10 K
Setp increase mixing valve
0…50 K
10 K
Setp increase heat exchanger
0…50 K
10 K
Setpoint increase storage tank
0…50 K
2 K
Extra configuration
Settings
Plant types
DHW 1 and DHW 5
DHW 2
, DHW 3 and
DHW 4
DHW 6
Primary control
Setpoint
3
-position or
DC 0…10 V actuator
Settings