Connection Diagrams - Siemens RDF302/VB Manual

Application
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
56 / 62
Siemens
Smart Infrastructure
5.2

Connection diagrams

RDF302 Basic documentation
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.
CE1P3079en
2022-06-17