OSD4 Thermostat

Comfort System 4™ includes the thermostat OSD4. It ensures maximum comfort and minimum energy consumption for all floor heating applications.

Notice: Discontinued product

Documents FAQ

OSD4-1999OJ 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

Product Documents

Product Sheets
Product Sheet, OSD4-1999, English
File type/size:PDF ( 560.63 KB )
Product Sheet, OSD4-1999, Portuguese
File type/size:PDF ( 566.36 KB )
Product Sheet, OSD4-1999, Russian
File type/size:PDF ( 578.22 KB )
Product Sheet, OSD4-1999. German
File type/size:PDF ( 510.58 KB )
User Manuals
User Manual, OCS4 / OSA4 / MCS4 / MSA4, English
File type/size:PDF ( 5.57 MB )
Instructions, OSD4 / MSD4, English
File type/size:PDF ( 472.38 KB )

Product FAQ

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.

Installation – Length of sensor cable


What is the maximum length of the sensor cable?


In general, it is recommended that the maximum sensor cable length should be 164 feet/50 meters, the length might be shorter. Read the instructions for the precise maximum length.

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.

What is the recommended night setback?


The recommended night setback is max 5°C/41°F

Does the adaptive function reset when making a factory reset?


Yes the adaptive function is reset during a factory reset.


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