Single-Duct - Siemens RDG400 Basic Manual

Single-duct,

heating or cooling
Modulating control: 3-position or DC 0...10 V
Note:
Setting the sequence and the control outputs
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Siemens
Building Technologies
4.7.4 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 4.6).
The diagrams below show the control sequence for modulating PI control.
Heating only (P01 = 0)
Y
Changeover (P01 = 2, 3)
Y
T[°C] Room temperature
w Room temperature setpoint
Y Control command "Actuator"
The diagrams show the PI controller's proportional part only.
Refer to section 4.5, 4.7.1 and 4.7.3 for details.
RDG400 Basic Documentation
Cooling only (P01 = 1)
Y
XpH Proportional band "Heating"
XpC Proportional band "Cooling"
Vmin Min. limitation for output
Vmax Max. limitation for output
CE1P3182en
2015-05-20