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Siemens
RDF300… / RDF340... / RDF400… / RDF600… Basic Documentation
CE1P3076.en
Smart Infrastructure
2020-02-21
4
Functions
4.1
Temperature control
The setting of he control parameters (P01 etc., mentioned throughout the
document) is described in section 4.14.
The controller acquires the room temperature via built-in sensor, external room
temperature sensor (QAA32), or external return air temperature sensor (QAH11.1),
and maintains the setpoint by issuing actuator control commands to heating and/or
cooling equipment. The following control outputs are available depending on the
controller type:
·
On/off control (2-position) with
RDF300…
/
RDF400… / RDF600…
·
Modulating PI control with 3-position control output on
RDF300…/RDF400… /
RDF600…
·
Modulating PI control with DC 0..10 V control output on
RDF340
The switching differential or proportional band is 2 K for heating mode and 1 K for
cooling mode (adjustable via parameters P30 and P31).
The integral action time for continuous PI control is 5 minutes (adjustable via
parameter P35).
The display shows the acquired room temperature or the setpoint for the current
operating mode, selectable via parameter P06. The factory setting displays the
current room temperature.
Use parameter P04 to display the room temperature or setpoint in °F rather than
°C as needed.
If the controller is used in a system with manual heating/cooling changeover
(P01=2), the heating
and cooling
symbols on the display show the fan coil or
terminal unit status. Thus, the symbols are displayed even when the controller
operates in the neutral zone. For all other cases, the heating
and cooling
symbols are displayed when the heating or cooling output is energized.
Concurrent display of the current temperature or setpoint in °C and in °F
(parameter P07) is possible on the controller without weekly time program.
General note
Display
/
Concurrent display of
°C and °F
