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Siemens RDF301 Basic Documentation

Siemens RDF301
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Siemens RDF301, RDF301.50..., RDF600KN, RDF600KN/S Basic Documentation CE1P3171en
Building Technologies 2017-12-07
3.6.3 2-pipe fan coil unit
On 2-pipe applications, the thermostat controls a valve in heating / cooling mode
with changeover (automatically or manually), heating only, or cooling only. Cooling
only is factory-set (P01 = 1).
ON/OFF control
The diagrams below show the control sequence for 2-position control.
Heating mode Cooling mode
½ SDH
1
0
½ SDH
w
Y
3
0
7
6
D
0
1
T[°C]
Y1
Y
½ SDC
1
0
½ SDC
w
3
0
7
6
D
0
2
T[°C]
Y1
T[°C] Room temperature SDH Switching differential "Heating" (P30)
w Room temperature setpoint SDC Switching differential "Cooling" (P31)
Y1 Control command "Valve" or "Compressor"
Modulating control: 3-position
The diagrams below show the control sequence for modulating PI control.
Heating mode Cooling mode
XpH
100
0
w
Y [%]
3
0
7
6
D
0
3
T[°C]
Y1
XpC
Y [%]
100
0
w
3
0
7
6
D
0
4
T[°C]
Y1
T[°C] Room temperature XpH Proportional band "Heating" (P30)
w Room temperature setpoint XpC Proportional band "Cooling" (P31)
Y1 Control command "Valve"
The diagrams only show the PI thermostat’s proportional part.
For the fan sequence see section 3.8.
Setting the sequence and the control outputs
Refer to section 3.4, section 3.6.1 and section 3.7.
Control sequence
ON/OFF output
Control sequence
modulating output
Notes:

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Siemens RDF301 Specifications

General IconGeneral
BrandSiemens
ModelRDF301
CategoryThermostat
LanguageEnglish

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