Basic Documentation
Table Of Contents
- 1 About this document
- 2 Overview
- 3 Notes
- 4 Functions
- 4.1 Temperature control
- 4.2 Operating modes
- 4.3 Room temperature setpoints
- 4.4 Application overview
- 4.5 Power supply selection for RDG200KN
- 4.6 Additional functions
- 4.7 Control sequences
- 4.7.1 Sequence overview (setting via P001)
- 4.7.2 Application mode
- 4.7.3 2-pipe fan coil unit
- 4.7.4 2-pipe fan coil unit with electric heater
- 4.7.5 2-pipe fan coil unit with radiator or floor heating
- 4.7.6 2-stage heating and cooling
- 4.7.7 4-pipe fan coil unit
- 4.7.8 4-pipe fan coil unit with electric heater
- 4.7.9 Chilled/heated ceiling and radiator applications
- 4.7.10 Compressor applications
- 4.7.11 Applications with external AQR sensor or QMX room operator unit
- 4.7.12 Setpoints and sequences
- 4.8 Control outputs
- 4.9 Fan control
- 4.10 Multifunctional input, digital input
- 4.11 Handling system faults
- 4.12 KNX communications
- 4.12.1 S-Mode
- 4.12.2 Master/slave configuration in KNX S-Mode
- 4.12.3 LTE-Mode
- 4.12.4 Zone addressing in LTE-Mode (with Synco)
- 4.12.5 Master/slave configuration in LTE-Mode
- 4.12.6 Example of heating and cooling demand zones
- 4.12.7 Send heartbeat and receive timeout
- 4.12.8 Startup
- 4.12.9 Heating and cooling demand
- 4.12.10 Fault and alarms function on KNX
- 4.13 Communication objects
- 4.14 Communication objects (LTE-Mode)
- 4.15 Control parameters
- 5 Supported KNX tools
- 6 Connection
- 7 Technical data
- 8 Dimensions
- Index
Functions
Handling system faults
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4.11 Handling system faults
If the room temperature exceeds or drops below the measuring range, i.e. above
49 °C or below 0 °C, the limiting temperatures blink, e.g., 0 °C or 49 °C .
In addition, the heating output is activated if the current setpoint is not set to Off,
the thermostat is in heating mode and the temperature is below 0 °C.
For all other cases, no output is activated.
The thermostat resumes Comfort mode as soon as the temperature is within the
measuring range.
● If the built-in temperature or humidity sensor fails and no external temperature
sensor is connected, fault message Er1 is displayed on the thermostat. If
EEPROM is damaged, fault message Er2 is displayed on the thermostat.
Replace the thermostat to measure the room temperature.
● If the external / remote temperature sensor fails and no external sensor is
connected, if input X1/X2/U1 is configured as AI except room temp external
sensor/return (AI), fault message Er3, Er4 or Er5 is displayed on the
thermostat. Check related sensor input terminals.
Fault
Thermostat
Fault information on bus
Display
Error code
Default fault text
Built-in sensor fails
and no external
sensor is
connected
Er1
---
---
EEPROM is
damaged
Er2
---
---
External / remote
sensor error
Er3
101
[N.X1] sensor error
External / remote
sensor error
Er4
102
[N.X2] sensor error
External / remote
sensor error
Er5
103
[N.U1] sensor error
For fault status messages on the bus, see Fault and alarms function on KNX
[➙ 116].
4.12 KNX communications
RDG2..KN thermostats support communications as per KNX specifications.
S-Mode
Standard mode; engineering via group addresses.
LTE-Mode
Logical Tag Extended mode, for easy engineering, is used
together with Synco.
4.12.1 S-Mode
This mode corresponds to KNX communications.
Connections are established via ETS by assigning communication objects to group
addresses.
Temperature out of range
Fault "Er1, Er2, Er3, Er4,
Er5" on display