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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83 | 170
4.7.8 4-pipe fan coil unit with electric heater
In 4-pipe applications with electric heater, the thermostat controls 2 valves in
heating and cooling mode by manual selection, heating only, or cooling only plus
an auxiliary electric heater. Heating and cooling is factory-set (P001 = 4).
The electric heater is used as an additional heat source when the heating energy
controlled by the valve is insufficient.
The electric heater receives an On command, if the temperature is below "setpoint"
minus "1/2 "dead zone" minus "setpoint differential" (= setpoint for electric heater).
Remote enabling/disabling of the electric heater is possible via input X1, X2, or U1
for tariff regulations, energy saving, etc.
Input X1, X2, or U1 must be commissioned accordingly (P150, P153 and P155).
See Multifunctional input, digital input [➙ 104].
The electric heater can also be enabled/disabled via bus.
Do not assign the function to a local input X1, X2 or U1 if the bus input is used.
CAUTION! The electric heater must always be protected by a safety limit
thermostat!
The heating or cooling output can be released via operating mode button if P001 is
set to Manual (P001 = 3).
The diagrams below show the control sequence for On/Off control.
Heating and cooling (P001 = 4)
Heating mode with manual selection
(P001 = 3)
Cooling mode with manual selection
(P001 = 3)
T[°C] Room temperature
YE Control command "EI heater"
w Room temperature setpoint
YH Control command
"Valve" (heating)
X
dz
Dead zone (P055)
YC Control command " Valve "
(cooling)
w
D
Setpoint differential
(P056)
SDH Switching differential
"Heating" (P051)
SDC Switching differential "Cooling"
(P053)
Heating and cooling with
auxiliary heater
Electric heating in heating
mode
Digital input "Enable
electric heater
Enable electric heater
4-pipe application with
manual changeover
On/Off control