Single-Duct Applications - Siemens KNX RDG400KN Basic Documentation

Modulating control: 3-position or DC 0...10 V, KNX LTE-Mode
Notes
Siemens
Smart Infrastructure
Y
H
100%
Vmax
Vmin
0%
SpH SpC
Com f/ E c o Com f / E co
3.6.5

Single-duct applications

On single-duct applications, the thermostat controls an actuator (air damper, VAV
system, valve, etc.) ...
– in heating/cooling mode with changeover (automatically or manually),
– in heating only mode, or
– cooling only mode.
Cooling only is factory-set (P01 = 1).
The output signal for the air flow can be limited to a minimum and maximum value
if required (see section 3.4.1).
The diagrams below show the control sequence for modulating PI control.
Heating only (P01 = 0)
Y
XpH
H
100%
Vmax
Vmin
0%
W
Changeover (P01 = 2, 3)
Changeover
Y
XpH XpC
H
100%
Vmax
Vmin
0%
W
T[°C] Room temperature
w Room temperature setpoint
Y Control command Actuator
· The diagrams only show the PI controller's proportional part
RDG400KN,RDG405KN Basic documentation
Y
C H
100%
Vmax
YV
Vmin
0%
TR [°C]
Cooling only (P01 = 1)
Y
100%
Vmax
Vmin
0%
TR [°C]
C
TR [°C]
XpH
XpC
Vmin
Vmax Maximum limitation for output
C
YV
SpH TR [°C]
SpC
P rot
P rot
XpC
W
Proportional band "Heating"
Proportional band "Cooling"
Minimum limitation for output
CE1P3192en
C
TR [°C]
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2019-04-12