Siemens RDG200KN, Basic Documentation, Page: 22 / 150

Functions
Temperature control
4
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4 Functions
4.1 Temperature control
Setting control parameters (P001 etc. mentioned throughout the document), see
Control parameters [ ➙ 108].
The thermostat acquires the room temperature via built-in sensor, external room
temperature sensor (LG-Ni1000 or NTC 3k), external return air temperature sensor
(LG-Ni1000 or NTC 3k) or via KNX (S-Mode or LTE-Mode), and maintains the
setpoint by delivering actuator control commands to heating equipment, cooling
equipment, or both. The following control outputs are available:
● On/Off control (2-position)
● Modulating PI/P control with PWM output
● Modulating PI/P control with 3-position control output
● Modulating PI/P control with DC 0...10 V control output
The switching differential is 1 K for heating/cooling mode (On/Off valve: P051 and
P053).
The proportional band is 2 K for heating mode and 1 K for cooling mode (DC, PWM
and 3-pos valves: P050 and P052).
The integral action time for modulating PI control is adjustable via P057 (heating)
and P058 (cooling) (factory setting: 45 minutes).
The display shows the acquired room temperature or the Comfort setpoint,
selectable via P008. The factory setting displays the current room temperature.
Configure P004 to display the room temperature or setpoint in °F or °C as needed.
When P008 = 1, the Comfort setpoint is always displayed even when the operating
mode changes.
The acquired room temperature (internal or external sensor) is available as
information on the bus.
RDG2..KN can also acquire the room temperature via KNX.
● With automatic changeover or continuous heating/cooling, symbols
indicate that the system is currently in heating or cooling.
● With manual changeover (P001 = 3), symbols indicate that the system
currently is in heating or cooling mode and symbols indicate that the
system is currently in heating or cooling. Thus, the symbols are displayed even
when the thermostat operates in the neutral zone.
Concurrent display of the current room temperature setpoint or current room
temperature in °C and °F is available (P009 = 1).
The outside temperature displays on the thermostat (P009 = 2). This temperature
value has only informational character.
In LTE-Mode, the outside temperature can only be received on outside
temperature zone 31.
In S-Mode, the corresponding communication object must be bound to a KNX
sensor device.
Time of day via bus displays on the thermostat (P009 = 3 or 4) in either 12- or
24-hour format.
Information is received from a Synco controller with time master function or any
other KNX device, if the corresponding communication object is bound.
General note:
Parameters
Temperature control
Display
Note
Room temperature
Concurrent display of °C
and °F
Outside temperature via
bus
Time of day via bus