Direct Dhw Heating - Siemens Synco 700 Basic Documentation

Extra configuration
Settings
Maintained secondary
circuit delta
Mixing valve function
Settings
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Building Technologies
HVAC Products
In addition, the maintained secondary circuit serves as an additional discharge protec-
tion. But the "Discharge protection" function remains active because the secondary
pump is controlled based on the primary temperatures on the heating side.
The maintained secondary circuit can only be used in connection with DHW plant types
DHW 3 through DHW 5.
The maintained secondary circuit is activated via configuration of the mixing valve.
Main menu > Commissioning > Extra configuration > DHW > Outputs > Maintained sec temp 3-
pos > ... or
Main menu > Commissioning > Extra configuration > DHW > Outputs > Maintained sec temp
modulating Assign terminal
For adapting the control parameters to the type of plant (actuator and controlled sys-
tem), the setting parameters to be used are the same as those used for mixing valve
control. They apply to both 3-position and DC 0...10 V actuators.
Main menu > Commissioning > Settings > ... or
Main menu > Settings > DHW > Controller maint sec temp
Operating line
Actuator running time
P-band Xp
Integral action time Tn
Maintained sec circuit delta
The maintained secondary circuit controls to the following setpoint:
Setpoint maintained secondary circuit = DHW setpoint + maintained secondary circuit delta
On completion of storage tank charging, the secondary pump will be deactivated and
the mixing valve will fully close. If the secondary sensor is faulty, the mixing valve for
the maintained secondary circuit will be opened.
10.5

Direct DHW heating

DHW 6
DHW heating takes place directly via the heat exchanger. Since there is no storage
tank so that charging control cannot be provided, control is permanently enabled.
The setpoint to be delivered by the heat source is made up of the current DHW setpoint
plus the setpoint increase of the heat exchanger.
For specific adaptation of the control parameters to the type of plant (actuator and
controlled system), additional setting parameters are available for direct DHW heating.
They apply to both 3-position and DC 0...10 V actuators.
Main menu > Commissioning > Settings > ... or
Main menu > Settings > DHW > Controller primary circuit
Operating line
Heat exchanger setp increase
Actuator running time opening
Modular Heating Controller RMH760B
10 DHW heating
Range
1...600 s
1...100 K
0...600 s
–20...20 K
Range
0...50 K
1...600 s
Factory setting
150 s
50 K
60 s
0 K
Factory setting
10 K
15 s
CE1P3133en
05.02.2007