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
70 | 170
A6V11545892_en--_b
4.7.3 2-pipe fan coil unit
In 2-pipe applications, the thermostat controls a valve in heating/cooling mode with
changeover (automatically or manually), heating only, or cooling only (factory
setting, P001 = 1).
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"
The diagrams below show the control sequence for modulating PI control.
Heating mode
Cooling mode
T[°C] Room temperature
XpH Proportional band "Heating"
(P050)
w Room temperature setpoint
XpC Proportional band "Cooling"
(P052)
YHC Control command "Valve"
The diagrams only show the PI thermostat’s proportional part.
For setting sequence and control outputs, see Application overview [➙ 40],
Sequence overview (setting via P001) [➙ 67] and Control outputs [➙ 91].
Parameter P256 (RDG260KN) sets the heating flow limitation when using a PICV.
See Additional functions [➙ 45].
On/Off control
Control sequence
On/Off control output
Modulating control:
3-position, PWM or
DC 0…10 V
Control sequence
modulating output
Note
Note