Data Sheet for Product

15
Siemens
A6V12005486_en--_c
Smart Infrastructure
2021-05-17
Connection diagrams
Application
2-pipe, 2-position
2-pipe, 3-position
4-pipe
1-stage compressor (heating and/or
cooling)
1-stage compressor with electric heater
(RDF660MB only)
N1 Room thermostat RDF660MB/MM,
RDF660MB
C1, C2 1-stage compressor
V1 Valve actuator, 2- or 3-position
V1, V2 Valve actuator, 2-position
S2 Switch (keycard, window contact, presence detector, etc.)
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)
M1 DC 0...10 V fan
E1 Electric heater (RDF660MB only)
Application examples
The thermostats support the following applications, that can be configured using the DIP
switches inside the front panel of the unit or a Modbus commissioning tool.
All DIP switches need to be set to OFF (factory setting) to select an application via commis-
sioning tool.
Remote configuration, via commissioning tool (factory setting)
DIP switches
Remote configura-
tion