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DDC420 Main Plant Controllers | DDC420 Main Plant Controller, BACnet

DDC420 is a controller for closed-loop and open-loop control, monitoring and optimizing heating, ventilation and air conditioning systems. The DDC420also has a fieldbus to allow for flexible enhancement with input and output modules, as well as with room control modules.

With an integrated Ethernet interface, the DDC420 provides a Web server to facilitate visualization, remote control and data backups via a web browser without the need for additional software. Fast, simple configuration, management and commissioning using the Designer project planning tool: Plant macros are set to configure the DDC420 completely, set the associated DDC software objects, configure the parameters and assign the input and output signals.


  • Native BACnet® in accordance with DIN EN ISO 16484-5 (BACnet® server functionality); facilitates communication with the BMS by Ethernet or modem.
  • Illuminated graphic display
  • Control panel with selection knob and function keys
  • Weekly schedule and annual schedule
  • Trend data can be saved and visualized
  • Different, password-protected operating levels for displaying and changing plant values; customer-specific plain texts for every parameter
  • User interface available in 12 languages (Czech, Dutch, English, French, German, Hungarian, Italian, Latvian, Polish, Russian, Spanish and Swedish)
  • Three closed-loop control circuits for heating or two for ventilation, which can be extended by hardware and software objects
  • Malfunction message logging with time and date