• The device is suitable for mounting on a recessed square conduit box with 60.3 mm fixing centers.
  • Recommended height: 1.5 m above the floor.
  • Do not mount the devices in recesses, shelves, behind curtains or doors, or above or near heat sources.
  • Avoid direct solar radiation and drafts.
  • Avoid unheated (uncooled) building area such as outside walls.
  • Seal the conduit box or the installation tube if any, as air currents can affect sensor readings.
  • Adhere to allowed ambient conditions.
Device damage

Carefully read all wiring diagrams prior to installation to avoid damage to the device caused by incorrect wiring of high or low voltages.

See Mounting Instructions A6V13989826 (RDF400BN), A6V12905642 (RDF440BN), A6V14064629 (RDF460BN), A6V14125361 (RDF400MB), A6V14125386 (RDF440MB) or A6V14125390 (RDF460MB) enclosed with the thermostat.


Wire, protect and earth in compliance with local regulations.

Risk of fire and injury due to short-circuits!

  1. Adapt the line diameters as per local regulations to the rated value of the installed overcurrent protection device.
  1. The power supply line (AC 100...230 V or AC 24 V) must have an external circuit breaker with a rated current of no more than 10 A.
  1. Disconnect from supply before removing the device from its mounting plate.
  1. Isolate the cables of all SELV terminals for AC 100...230 V, e.g.,
  • RDF4..BN: BACnet/Modbus communication input BN+, BN- and REF for AC 100...230 V
  • RDF4..MB: Modbus communication input MB+, MB- and REF for AC 100...230 V
  1. Nominal power of electrical heater needs to be lower than 0.8 kW, additional security element must be installed. (RDF400.., RDF460..)