Thermostat OSD4

Thermostat OSD4 Radio controlled thermostat is part of central control system. The thermostat ensures maximum comfort and minimum energy consumption.

OJ Microline® CS4™ Thermostat
- energy efficient comfort

Comfort System 4™ includes the thermostat OSD4. It ensures maximum comfort and minimum energy consumption for all floor heating applications. Easy to both operate and program. Designed for use with Comfort System 4™ Central Controller.

Green Comfort - Save up to 36% CO2.             

  • Energy efficient all-in-one thermostat, ideal for all floor types
  • Slimmest radio controlled thermostat on the market, only 20 mm depth.
  • With snap mounting of front cover, this makes installation easier than ever
  • Compatible with other makes of floor sensor, ideal for renovation
  • Simple programming, ensuring the fastest and easiest set-up
  • Maximum safety thanks to built-in 2-pole 16 A interrupter
  • Supplied with new thin floor sensor, making sensor installation more comfortable than ever
  • Easy menu navigation and programming






  • What is the recommended night setback?


    The recommended night setback is max 5°C/9°F



  • Does the adaptive function reset when making a factory reset?


    Yes the adaptive function is reset during a factory reset.



  • Where to connect the ground wire of floor mats?


    The ground wire in the floor mat must be connected directly to the ground wire of the supply.

  • What is the maximum lenght of the sensor cable?


    In general, we recommend a maximum cable length of 50 meters, the lenght might be shorter. Read the instructions for the precise maximum lenght.

  • How can I cure the E2 error message?


    "E2" means defective, damaged or disconnected floor sensor. Sensor resistance should be 10 or 12 kOhm at 25°C (77°F). The onstruction or quick guide holds informatiom for the specific thermostats.