Mounting and installation - Basic Documentation - RDF600KN - RDF600KN/S - RDF600KN/VB

Semi-flush mount room thermostats with KNX communications RDF301, RDF301.50, RDF301.50H, RDF600KN, RDF600KN/VB, RDF600KN/S

Product Family
Desigo PX Open
Desigo Open
Product Group
Thermostats (temperature controller with sensor)
Building automation
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Technical Documentation > Basic Documentation
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Mount the room thermostat on the conduit box. Do not mount on a wall in niches or bookshelves, behind curtains, above or near heat sources, or exposed to direct solar radiation. Mount about 1.5 m above the floor.


Mounting /
  • Mount the room thermostat in a clean, dry indoor place without direct airflow from a heating / cooling device, and not exposed to dripping or splash water.

  • In case of limited space in the conduit box, use mounting bracket ARG70.3 to increase the headroom by 10 mm.


See Mounting Instructions enclosed with the thermostat.
M3171... [3], M3076.3 [3a]

  • Comply with local regulations to wire, protection and earth the thermostat.


No internal line protection for supply lines to external consumers (Q1, Q2, Q3, Yxx)

Risk of fire and injury due to short-circuits!

  • Adapt the line diameters as per local regulations to the rated value of the installed overcurrent protection device.

  • The AC 230 V mains supply line must have an external circuit breaker with a rated current of no more than 10 A.

  • Properly size the cables to the thermostat, fan and valve actuators for
    AC 230 V mains voltage.

  • Use only valve actuators rated for AC 230 V.

  • Cables of SELV inputs X1-M/X2-M: Use cables with 230 V insulation, as the conduit box carries AC 230 V mains voltage.

  • Inputs X1-M or X2-M of different units (e.g. summer/winter switch) may be connected in parallel with an external switch. The maximum contact current rating for the external switch should fulfill the overall sensing current of all connected inputs.

  • KNX communication cables (input CE+ / CE-): Use cables with 230 V insulation, as the conduit box carries AC 230 V mains voltage.

  • Disconnect from supply before opening the cover.

  • When a KNX bus power supply is connected on the line with communicating thermostats and Synco controller, the internal KNX power supply of the Synco controllers must be switched off.