Single-Duct - Siemens RDG400KN Basic Documentation

Modulating control: 3-position or DC 0...10 V
Note:
Setting the sequence and the control outputs
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Siemens
Building Technologies
3.6.4

Single-duct

On single-duct applications, the thermostat controls an actuator (air damper, VAV
system, valve etc.)...
– in heating / cooling mode with changeover (automatic or manual),
– 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 3.5 "Additional features").
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 show the PI controller's proportional part only.
Refer to sections 3.4 "Applications", 3.6.1 "Sequences", and 3.7 "Outputs".
RDG400KN Basic documentation
Functions
Cooling only (P01 = 1)
Y
100%
Vmax
Vmin
0%
TR [°C]
C
TR [°C]
XpH Proportional band "Heating"
XpC Proportional band "Cooling"
Vmin Min. limitation for output
Vmax Max. limitation for output
XpC
C
W
TR [°C]
CE1P3192en
20 Jul 2010