General functions

  • Room temperature control via:
    • Built-in temperature sensor
    • External room temperature sensor (RDF4..BN)
    • Temperature from bus
  • Selection of operating modes via operating mode button: Comfort or Economy
  • Selection of automatic or manual fan mode
  • Changeover between heating and cooling mode:
    • Remote via bus
    • Remote via local multifunctional input
    • Automatic via changeover sensor on pipe (RDF4..BN)
    • Manual via local HMI
  • Measured value adjustment of:
    • Built-in sensor
    • External temperature sensor (RDF4..BN)
  • Key lock function
  • Configurable operating mode after power-up: Previous mode, Comfort or Protection
  • Surge protection at power-up

 

Setpoints and display

  • Min. and max. limitation of room temperature setpoint adjustment
  • Display of current room temperature or setpoint in ℃, ℉ or both
  • Display of time of day from bus

 

Setting

  • Setting of commissioning and control parameters via:
    • Local HMI
    • BACnet commissioning tool (RDF4..BN)
    • Modbus commissioning tool
    • Siemens smartphone app Quick Config (RDF4..BN)
  • Reloading factory settings
  • User settings and control parameters are retained in case of power failure
  • Parameter protection by password (disabled by default)

 

Fan

  • 1-speed, 3-speed or DC 0...10 V fan control
  • Configurable fan start kick and fan kick in Economy
  • Configurable fan operation in zero energy zone (dead zone)
  • Fan operating hours counter

 

Inputs (RDF4..BN)

  • 2 multifunctional inputs, X1 (for sensor/dry contact/DC 0...10 V) and D1 (for dry contact), selectable for:
    • External room temperature sensor
    • Sensor for automatic heating/cooling changeover
    • Switch for remote heating/cooling changeover
    • Window contact to switch operating mode to Protection
    • External alarm source for status reporting via bus
    • Presence detector to switch operating mode to Comfort
    • Hotel presence detector to switch operating mode to Economy and lock the screen when the room is unoccupied
    • DC 0...10 V feedback signal of modulating valve state (RDF440BN)

 

Inputs (RDF4..MB)

  • 1 digital input D1 (for dry contact), selectable for:
    • Switch for remote heating/cooling changeover
    • Window contact to switch operating mode to Protection
    • External alarm source for status reporting via bus
    • Presence detector to switch operating mode to Comfort
    • Hotel presence detector to switch operating mode to Economy and lock the screen when the room is unoccupied

 

Communication

  • Selectable communication protocol: BACnet MS/TP or Modbus RTU Server (RDF4..BN)
  • Communication protocol Modbus RTU Server (RDF4..MB)
  • Central control of setpoints and operating mode from bus
  • Monitoring of device status via bus
  • Parameter read/write via bus
  • Forced operating mode to Protection via bus