SAUTER
flexotron®400 - RDT405
Control modes
P100012100
12
5.1 Control mode 1, Temperature control
The analogue outputs can be configured to the following combinations:
AO1
/
AO2
1. Heating
/
-
2. Cooling
/
-
3. Heating
/
Cooling
4. Heating
/
Heating
5. Cooling
/
Cooling
6. Heating
/
Damper
7. Cooling
/
Damper
8. Change-over /
(Seasonal change-over between heating and cooling)
When an external setpoint device is used, the setpoint is received via the SPI
input, which has a resolution of 0…40°C.
In alternative 4, Heating-Heating AO2 will be activated first on increasing heat
demand.
In alternative 5, Cooling-Cooling AO2 will be activated first on increasing cooling
cemand.
In alternative 6, Heating-Damper, at temperatures above the setpoint the damper
on AO2 will be fully open. On increasing heating demand, the damper on AO2
will first close to the set minimum value before the heating output on AO1 starts
to increase.
In alternative 7, Cooling-Damper, at temperatures below the setpoint the damper
on AO2 will be fully open. On increasing cooling demand, the damper on AO2
will first close to the set minimum value before the cooling output on AO1 starts
to increase.
Temperature control is available for three selectable temperature ranges:
Low range (1): -
20…+60°C
(Default SP= 21°C, minSP= -18°C, maxSP= +60°C)
Mid range (2): 20°C…100°C
(Default SP= 55°C, minSP= 22°C, maxSP= 100°C)
High range (3): 60…140°C
(Default SP= 95°C, minSP= 62°C, maxSP= 140°C)
DI1, Start signal
Normal control will only be activated when this input is activated, closed. Active
signal is indicated by a fan-symbol in the display. When the start signal is
deactivated the controller will set the outputs to 0.
This input must always be wired since it controls the starting and stopping of
normal control.
Universal input UI1, outdoor
The change-over function will make a seasonal change of the function of the
output signal on AO1. In summer the output will work as a cooling output and in
winter as a heating output. This is used in applications (fan-coil units) where the
same piping is used to transport hot water in the winter and chilled water in the
summer.
The universal input UI1 is used for the change-over function in alternative 8. Wire
the input as a digital input using either a manual switch or a thermostat