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
Control sequences
4
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4.7.5 2-pipe fan coil unit with radiator or floor heating
In 2-pipe applications with radiator, the thermostat controls a valve in
heating/cooling mode with changeover, heating only, or cooling only plus a radiator
valve. Cooling only is factory-set (P001 = 1).
In cooling mode, the valve receives an Open command if the acquired temperature
is above the setpoint.
The radiator receives an On command if the acquired room temperature drops
below "setpoint" minus "dead zone" (= setpoint for radiator).
In heating mode, the radiator receives an Open command if the acquired
temperature is below the setpoint. The fan coil unit is used as an additional heat
source when the heating energy controlled by the radiator is insufficient.
The fan coil unit receives an On command if the temperature is below "setpoint"
minus "setpoint differential" (= setpoint for fan coil unit).
The radiator sequence can also be used for floor heating.
"Floor heating limitation (P252)" function, see Monitoring and limiting functions
[➙ 51].
The diagrams below show the control sequence for On/Off control.
Heating mode
Cooling mode
T[°C] Room temperature
SDH Switching differential "Heating"
(P051)
w Room temperature setpoint
SDC Switching differential "Cooling"
(P053)
YHC Control command "Valve" or
"Compressor"
SDR Switching differential "Radiator"
(P054)
YR Control command "Radiator"
X
dz
Dead zone (P055)
w
D
Setpoint differential (P056)
Heating or cooling with
radiator or floor heating
Radiator, active in cooling
mode
Radiator in heating mode
Floor heating
On/Off control