ETN4 All-in-one DIN Rail Thermostat

If you need a thermostat for floor heating control, sauna, frost protection of pipes or cooling applications, the ETN4-1999 gets the job done.

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ETN4The ETN4 completes your OJ Microline product range

If you need a thermostat for floor heating control, sauna, frost protection of pipes or cooling applications, the ETN4-1999 gets the job done. An all-in-one thermostat with extented temperature control range, suitable for a wide range of applications. Easy to operate and programme.

The all-in-one thermostat is perfect for:

  • Electrical floor heating
  • Frost protection
  • Ice & Snow melting
  • Cooling
  • Extended temperature range -19.5° to +70°C.
  • Input for night setback and frost protection
  • Easy menu navigation and programming.
  • Includes new thin floor sensor -mounting sensor is more comfortable than ever
  • Now also with cooling application – invertible relay function and differential temperature
  • Optimum safety due to built-in 2 pole 16 Amp interrupter
  • Large backlit display

Product Documents

Product Sheets
Product Sheet, ETN4-1999, English
File type/size:PDF ( 401.46 KB )
Product Sheet, ETN4-1999, German
File type/size:PDF ( 269.12 KB )
Product Sheet, ETN4-1999, Russian
File type/size:PDF ( 326.96 KB )
Product Catalogue 2023 Europe-Asia-South-America, English
File type/size:PDF ( 2.59 MB )
Product Catalogue 2023, Australasia / Africa, English
File type/size:PDF ( 4.00 MB )
Product Catalogue, HVAC Controls and Drives, 2023, English
File type/size:PDF ( 2.47 MB )
User Manuals
User Manual, ETN4-1999 (EN, DE, RU, FR)
File type/size:PDF ( 747.74 KB )
User Manual, ETN4-1999 (EN, FI)
File type/size:PDF ( 600.28 KB )
Instructions, ETN4-1999 (EN, DE, RU)
File type/size:PDF ( 476.68 KB )

Product FAQ

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.

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 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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