Climate Controller With CO2 and %RH Sensor and BACnet MS/TP Communication

In stock (2 items available)
  • Weight
    0.3 kg
  • SKU
    SXS-166

The SRC-200 series controllers have been designed for climate control of room spaces. Applications include Fan Coil Unit Control, Chilled Ceiling and Zone Heating Control, VAV applications and in Natural Ventilation applications.

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The SRC-200 series controllers have been designed for climate control of room spaces. The SRC-200 controllers can be used in wide range of applications including Fan Coil Unit Control, Chilled Ceiling and Zone Heating Control, VAV applications and in Natural Ventilation applications.

The controllers have 2 heating and 2 cooling stages for control of temperature. All stages are fully configurable to 4 x 0..10Vdc outputs and 2, 24Vac triac outputs.

The controllers have built-in accurate temperature measurement, and an external resistive NTC10 temperature sensor input as standard. With the -RI2 option it is possible to add a second NTC10 sensor input. When the -RI2 option is installed, the controllers are supplied with the push button setpoint.

Built-in CO2 sensor provides a unique solution for fan assisted and natural ventilation applications. Only one enclosure required! All in one solution.

Built-in relative humidity RH sensors allows room space humidity also be controlled accurately.

The controllers have 4 analogue 0..10Vdc outputs and two digital outputs that can be configured for any of the temperature heating stages, CO2 control, Maximum VAV Demand Control, Fan Speed Control, Maximum Fan Control or Humidity Controler. The controllers can operate as Proportional Only or as Proportional + Integral Controllers and all ouptuts can be reversed.

The 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 via the configuration tool or via the communication network. Alternatively with the -SPB option the setpoint knob is replaced by two push buttons. With the push buttons it is possible to adhjust the current setpoint, and it also can be reset by the BMS e.g. every morning.

The further optional backlit push button allows the users easily to override the selected control output to fully open position. This can be used, for example, to override the windows open or boost the fan speed. The push button has built-in timer and blue backlight for status indication.

With -AI1 and -AI2 options it is possible to monitor 0-10V signals such as pressure and flow sensors. The AI1 0-10V input can also be linked to the auxiliary control loop to provide additional plant control.

Built-in display shows the system status with clear indication and can also be used for alarm display of CO2, temperature and/or humidity (white, amber, red).

The BACnet communication supports automatic device and point discovery making the controller configuration as a part of the BACnet system fast, simple and efficient.


  • Wide Range of Applications; Fan Coil Unit Control, VAV Control, Chilled Ceilings, Zone Heating, Natural Ventilation
  • Up to 2 Heating and up to 2 Cooling stages
  • CO2 Measurement and Control
  • Relative Humidity Measurement Control
  • Backlight Push Button Override Option (overrides the selected output to 100%)
  • BACnet MS/TP Communication with Support for Device Discovery
  • Address and Baud Rate Setting via Bit switch or via the Configuration Software
  • Built-In Temperature Sensor
  • External Auto-Detecting NTC10 Temperature Sensor (RI1)
  • Optional Additional External Temperature Sensor (RI2)
  • Optional 0-10V Voltage Measurement and Control instead of the Resistive Inputs
  • Backlit LCD display for temperature, setpoint, CO2, humidity, valve position, fan speed, heating/cooling mode, night/day mode, alarm display
  • Rotary knob for the setpoint adjustment
  • Configuration via SW-DCT-USB Windows based configuration tool


  • Power supply: 24Vac/dc Power Supply
  • Outputs: 4 Analogue 0..10Vdc Outputs Configurable to Any of the Stages
  • Outputs: 2 Digital 24Vac Triac Outputs; Configurable for On/Off, PWM (Thermic) and 3-Point Control
  • Inputs: 2 Digital Inputs for Day Override (e.g. occupancy sensor), Night Override (e.g. window switch) or Cooling Disable (condensation switch)
  • Protocol: BACnet MS/TP
  • Interface: RS485 maximum 63 devices
  • Addressing: 0..63 via a bit switch; 0..247 via tool / network
  • Communication: 9k6/19k2/38k4/76k8 Baud; Parity None/Even/Odd, 1 or 2 Stop
  • Temperature range: 0°C...+50°C (32..122°F)
  • Humidity: 0...95%rh (non-cond.)
  • Standards CE: Conformity CE Directive 2004/108/EY EN61000-6-3: 2001 (Generic Emission) EN61000-6-1: 2001 (Generic Immunity)
  • Degree of Protection: IP20
  • Housing: ABS Plastics, Self Extinguishing
  • Dimensions: W86 x H120 x D29mm

Faulty Goods and Warranty

Where such goods have been supplied we undertake to repair or replace them as quickly as possible.Prior to returning faulty items, please contact us with a description of the fault as one of our engineers might be able to assist you by resolving the issue over the phone.
A Warranty form must be filled out and returned with any goods.

Our standard warranty period is 12 months from the date of purchase unless stated otherwise.

Other warranty periods:

Labjack Products: 5 Years
Atop Products: 3 Years
MeanWell Products: 3 Years
Terracom Products: 3 Years

Warranty is subject to us being satisfied that a defect was caused by defective workmanship or materials and was not caused by or was not substantially contributed to by other factors beyond our control including incorrect installation, alterations or modifications of the product not recommended by the manufacturer.

Returns Policy

If you are dissatisfied with our goods you may return them within 14 days of the dispatch date. Contact us for an authorisation and we will refund your purchase less shipping costs and restocking fees. All returned goods MUST be in AS NEW condition including ALL PACKAGING and DOCUMENTATION / MANUALS etc.

Please note:

  • The product returned will attract a 20% restocking fee.
  • The customer must pay the delivery costs.
  • Non standard, custom made or a specially manufactured or imported products are not returnable.
  • Semiconductors, books and software are not refundable

Full Terms and Conditions

By placing an order with Ocean Controls, you agree to be bound by our Terms and Conditions of Trade.

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