User Manual
Table Of Contents
- 1. About this document
- 2. Summary
- 3. Functions
- 3.1 Temperature control
- 3.2 Operating modes
- 3.3 Room temperature setpoint
- 3.4 Applications overview
- 3.5 Additional functions
- 3.6 Control sequences
- 3.7 Control outputs
- 3.8 Fan control
- 3.9 Multifunctional input, digital input
- 3.10 Handling faults
- 3.11 Modbus RTU mode
- 3.12 Communication objects
- 3.13 Control parameters
- 4. Handling
- 5. Connection
- 6. Mechanical design
- 7. Technical data
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Siemens RDF302 Basic documentation CE1P3079en
Smart Infrastructure 2020-12-01
5.2 Connection diagrams
Application
N1 Room thermostat RDF302...
M1 1- or 3-speed fan
V1 Valve actuator, 2- or 3-position
V1, V2 Valve actuator, 2-position
E1 Electric heater
C1, C2 1-stage compressor
S1, S2 Switch (keycard, window contact,
presence detector, etc.)
B1, B2 Temperature sensor (return air
temperature, external room
temperature, changeover sensor, etc.)
+ RS485 Modbus connection
- RS485 Modbus connection
REF RS485 signal/common ground
(Differential common)
RDF302.B does not have inputs X1, X2 and M.
2-pipe / heating or
cooling – ON/OFF
2-pipe, / heating or
cooling – 3-position
– Y11 = Open
– Y21 = Close
2-pipe and el.
heater/
Heating or cooling
and el. heater
4-pipe /
Heating and radiator
– V1 = Heating
– V2 = Cooling
1-stage compressor
– C1 = Heating
and / or
– C2 = Cooling
1-stage compressor
and electric heater
L
N
10 A
L
N
Y11
Y21
AC 230 V
X1
M
X2
N1
M1
V1
5(2)A
Max.
5(2)A
Max.
B2
S2
B1
S1
3
1
7
1
A
1
2
Q1 Q2 Q3
I II III
+ -
REF
V1
5(2)A
Max.
E1
5(2)A
Max.
5(2)A
Max.
V1
C1
5(2)A
Max.
V1
5(2)A
Max.
V2
5(2)A
Max.
C1
5(2)A
Max.
E1
5(2)A
Max.
C2
5(2)A
Max.
+
-