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Siemens RDG100…/RDG110…/RDG140.../RDG160… Basic Documentation CE1P3076.en
Building Technologies Functions 28 May 2009
4 Functions
4.1 Temperature control
Setting of the control parameters (P01, etc., mentioned throughout the document)
is described in section 4.15.
The thermost
at acquire
s 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 delivering actuator control commands to heating
and/or cooling equipment. The following control outputs are available depending on
the thermostat type:
• 2-position control on RDG100, RDG100T, RDG110
• PI / P control with 3-position control output on RDG100, RDG100T,
• PI / P control with PWM output on RDG100, RDG100T
• PI / P control with DC 0…10 V control output on RDG140, RDG160
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 modulating PI control is 5 minutes (adjustable via
parameter P35).
The display shows the acquired room temperature or the Comfort setpoint, selecta-
ble 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 thermostat 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 thermostat
operates in the neutral zone. For all other cases, the heating
and cooling
symbols are displayed when the heating or cooling output is activated.
Concurrent display of the current temperature or setpoint in °C and °F (parameter
P07) is possible on the thermostats without 7-day time program.
General note
Display
/
Concurrent display of
°C and °F
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