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Siemens
RDG400KN,RGD405KN Basic documentation
CE1P3192en
Building Technologies
2017-02-17
3.6.3 Application mode
The behavior of the thermostat can be influenced by a building automation and
control system (BACS) via bus using the
Application mode
command. With this
signal, cooling and/or heating activity can be enabled or disabled. Application mode
is supported in LTE- and S-Mode. The RDG..KNX room 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 only allows
heating
Heating only
3 Cool
Thermostat is only allowed to provide cooling Cooling only
4 Night
purge
If
Night purge
is received, the room should
be aired with cool outside air if necessary.
The thermostat opens the air damper and
does not heat/cool with the coils or the
electric heater.
Function will be ended by any operation on
the thermostat
Open air damper fully
if night purge condition
is valid
1)
5 Pre-cool
If
Pre-cool
is received, the room should be
cooled down as fast as possible (if
necessary). The thermostat only allows
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 only allows heating
Heating only
9 Fan
only
All control outputs are set to 0% and the air
damper is fully opened.
Function will be ended by any operation on
the thermostat
Open air damper fully
With all other commands, the thermostat behaves like in Auto mode, i.e. heating or
cooling according to demand.
1) Conditions for the "Night purge" function:
RDG400KN
The function is activated when …
A: No supply air temperature via KNX is available:
Current room temperature > Comfort setpoint cooling
B: The supply air temperature via KNX is available (or air changeover is made by the
supply air temperature via KNX):
Current room temperature > supply air temperature and current room
temperature > Comfort setpoint cooling
RDG405KN
Function is activated when:
A: No supply air temperature is not available:
Current room temperature > Calculate Comfort heating setpoint plus 1K
B: Supply air temperature is available
Current room temperature > Calculate Comfort heating setpoint plus 1K and
the supply air temperature is plus 3K < Current room temperature.
Function is deactivated when:
The current room temperature < Calculate Comfort heating setpoin or
The supply air temperature plus 2K > Current room temperature
KNX
R
Application mode