The selected product display requires Javascript enabled in your browser. Please enable Javascript and try again!

Modulating Modbus Room and FCU Controllers | SRC-100-MOD Modbus Heating and Cooling Room Controller, Htg and Clg LEDs

Modbus Heating and Cooling Room Controller, Htg and Clg LEDs

Datasheet (682kB)

The SRC-100 series controllers have been designed for zone heating and cooling control. The controllers have 3 analogue 0..10Vdc outputs and two digital outputs that can be configured for heating and cooling control. The controllers can operate as Proportional Only or as Proportional + Integral Controllers.

The controller can have up to 2 heating and cooling stages. The analogue outputs can be individually configured for any of the heating/cooling stages and digital outputs can be configured as 3-point, PWM (thermic) or On/Off control.

The controller setpoint can be adjusted -/+3°C (default) by rotating the potentiometer. The setpoint centre and setpoint limits can be adjusted in the configuration mode or via the configuration tool.

On the models without the display; red and blue LEDs indicate the controller operation in heating or cooling mode. In the display models, the display shows the heating and cooling modes, the current active actuator position, and the current temperature reading. When the setpoint is adjusted, the backlight is switched temporarily on and the current setpoint is displayed.

The controllers have built-in Modbus RS-485 communication for connection to BMS systems.


  • Configurable Room and Zone Controllers
  • Up to 2 Heating and up to 2 Cooling stages
  • Modbus RTU RS-485 Communication
  • Address and Baud Rate Setting via Bit switch or via the Configuration Software
  • 3 Analogue 0..10Vdc Outputs Configurable to Any of the Stages
  • 2 Digital 24Vac Triac Outputs; Configurable for On/Off, PWM (Thermic) and 3-Point Control
  • Built-In Temperature Sensor
  • External Auto-Detecting Temperature Sensor
  • Digital Input for Night Mode or Cooling Disable Override
  • Non-display version has red and blue LEDs indicating if the temperature is below or above the setpoint
  • Display versions show temperature, setpoint, heating / cooling mode, night mode
  • Display has configurable backlight level
  • Rotary knob for the setpoint adjustment
  • Configuration via two concealed buttons and LCD display (LDC display add-on available for non-display models)
  • Alternatively the configuration is done via SW-DCT-USB Windows based configuration tool
  • 24Vac/dc power supply