Technical data

3.6.2 Application mode
The behavior of the thermostat can be influenced by a building automation and
control system (BACS) via bus with the command "Application mode".
With this signal, cooling and/or heating activity can be enabled or disabled.
Application mode is supported in LTE mode and S-mode.
The RDF KNX thermostats support the following commands:
# Application
mode
Description Control sequence
enabled
0 Auto Thermostat automatically changes between
heating and cooling
Heating and/or cooling
1
Heat
Thermostat is only allowed to heat
Heating only
2 Morning
warm-up
If "Morning warm-up" is received, the room
should be heated up as fast as possible (if
necessary). The thermostat will only allow
heating
Heating only
3
Cool
Thermostat is only allowed to provide cooling
Cooling only
4
Night purge
Not supported by fan coil applications
N/A (= Auto)
5 Pre-cool If "Pre-cool" is received, the room should be
cooled down as fast as possible (if
necessary). The thermostat will only allow
cooling
Cooling only
6 OFF Thermostat is not controlling the outputs,
which means all outputs go to off or 0%
Neither heating nor
cooling
8 Emergency
heat
The thermostat should heat as much as
possible. The thermostat will only allow
heating
Heating only
9 Fan only All control outputs are set to 0% and only the
fan is set to high speed.
Function will be terminated by any operation
on the thermostat
Run fan in high speed
With all other commands, the thermostat behaves like in Auto mode, i.e. heating or
cooling according to demand.
KNX
R
Application mode
33 / 92
Siemens RDF301, RDF301.50..., RDF600KN Basic documentation CE1P3171en
Building Technologies Functions 2014-05-23