Semi flush-mountcommunicating roomthermostats


  • KNX bus communications (S-mode and LTE mode)
  • Backlit display
  • 2P / PI / P control
  • Outputs for on/off or 3-position control
  • Outputs for 3-speed or 1-speed fan
  • 2 multifunctional inputs for keycard contact, external sensor, etc.
  • Operating modes: Comfort, Economy and Protection
  • Automatic or manual fan speed control
  • Automatic or manual heating/cooling changeover
  • Minimum and maximum limitation of room temperature setpoint
  • Control depending on the room or the return air temperature
  • Adjustable commissioning and control parameters
  • Commissioning with Synco ACS, ETS or via local HMI
  • Integration into Synco
  • Integration into Desigo via group addressing (ETS) or via individual addressing
  • Integration into third-party system via group addressing (ETS)
  • AC 230 V operating voltage
  • User and parameter settings can be retained or restored with power loss


Room temperature control (heating or cooling) in individual rooms and zones by means of:

  • 2-pipe fan coil units
  • 2-pipe fan coil units with electric heater
  • 4-pipe fan coil units
  • Compressors in DX-type equipment
  • Compressors in DX-type equipment with electric heater

The thermostats control:

  • One 1-speed or 3-speed fan
  • One or two on/off valve actuators
  • One on/off valve actuator and one 1-stage electric heater
  • One 3-position valve actuator
  • One 1-stage compressor in DX-type equipment, or one 1-stage compressor with electric heater

Used in systems with:

  • Heating or cooling mode
  • Automatic heating/cooling changeover
  • Manual heating/cooling changeover
  • Heating and cooling mode (e.g. 4-pipe system)

RDF600KN/S only:

  • Four buttons to control KNX actuators via KNX S-mode. (“Switching groups” with functions such as switching, dimming, blinds control, 8-bit scene).

The room thermostats are delivered with a fixed set of applications. The relevant application is selected and activated during commissioning using one of the following tools:

  • Synco ACS
  • ETS
  • Local DIP switch and HMI
  • Room temperature control via built-in temperature sensor or external room temperature / return air temperature sensor.
  • Changeover between heating and cooling mode (automatically via local sensor or bus, or manually).
  • Selection of applications via DIP switches or commissioning tool.
  • Selection of operating mode via operating mode button on the thermostat.
  • Temporary Comfort mode extension.
  • 1-speed or 3-speed fan control (automatically or manually).
  • Display of current room temperature or setpoint in °C and/or °F.
  • Minimum and maximum limitation of room temperature setpoint.
  • Button lock (automatically and manually).
  • 2 multifunctional inputs, freely selectable for:
    – Sensor for automatic heating/cooling changeover
    – External room temperature or return air temperature sensor
    – Dew point sensor
    – Electric heater enable
    – Fault input
    – Monitor input for temperature sensor or switch state
    – Window contact
    – Presence detector (standard presence and hotel presence)
  • Advanced fan control function, e.g. fan kick, fan start, selectable fan operation (enable, disable or depending on heating or cooling mode).
  • Purge function together with 2-port valve in a 2-pipe changeover system.
  • Reminder to clean fan filters (adjust with P62).
  • Floor heating temperature limitation.
  • Reload factory settings for commissioning and control parameters.
  • KNX bus (terminals CE+ and CE-) for communication with Synco or KNX compatible devices.
  • Display of outdoor temperature or time of day via KNX bus.
  • Time scheduling and central control of setpoints via KNX bus.
  • With a Synco RMx7xx controller, the energy demand signal of the thermostat is used to optimize energy supply.