We recommend hiring licensed installers to mount and install the thermostat.

  • The thermostat is suitable for wall mounting.
  • The recommended height is 1.50 m above the floor.
  • Do not mount the thermostat in recesses, shelves, behind curtains or doors, or above or near heat sources.
  • Avoid direct solar radiation and drafts.
  • Seal the conduit box or the installation tube if any, as air currents can affect sensor readings.
  • Adhere to allowed ambient conditions.

Installing your thermostat

In addition to the following instructions, a step-by-step graphical instruction showing how to assemble different components and mount the thermostat can be found in the Mounting instructions. The following part only gives textual instructions so as to assist you with safe and successful mounting.

  1. Switch off power to your heating system and old thermostat by using your home’s breaker box.
  1. Remove the cover of your old thermostat.
  1. Label the wires according to your old thermostat terminal designations, using the stickers provided together with the thermostat. It is also helpful if you take a picture of the current wire connections for reference later on.
  1. Disconnect all the labeled wires and then remove your old thermostat.
    NOTICE! Do not dispose of your old thermostat as part of household waste if it contains mercury in a sealed tube. Contact a thermostat recycling organization, for example,, for safe disposal of your old thermostat.
  1. Determine if you need to have more wires connected to the power unit to be installed. If so, prepare the wires and label them accordingly. We strongly recommend hiring installers to connect the wires.
  1. Seal the conduit box or the installation tube to prevent entry of cold or hot air and make sure the temperature readings of the internal sensor are correct.
  1. Screw the mounting plate tightly on the conduit box using a screwdriver, making sure the mounting plate is placed correctly (the part with the upward arrow placed on the top).
  1. Connect the labeled wires to the terminals following the thermostat terminal designations. Use a screwdriver to tighten down the screws to secure the inserted wires.
    NOTICE! There are four pairs of L and N terminals on the power unit. However, you can combine any L with any N terminal.
  1. Screw the power unit on the mounting plate tightly.
  1. Attach the front module horizontally. Ensure that each side of the front module aligns with the power unit and press the corners in the order illustrated below: Top (1); bottom (2) until each corner clicks in place. Note: You must discharge static electricity from your body before mounting the front module. For example, touching the wall can help discharge static electricity.
  1. Switch the power back on to your heating system and thermostat by using your home’s breaker box.


See the Mounting instructions for more information.

  • Comply with local regulations to wire, fuse and earth the thermostat. Connect the conduit box to earth (safety ground).
  • Adapt the line diameters as per local regulations to the rated value of the installed overcurrent protection device.
  • The line voltage cables and signal cables must be arranged separately.
  • X1, M and X2 wires operate at SELV (Safety Extra Low Voltage) level. Do not insert cables with AC 230 V mains voltage into terminals X1, M and X2 and vice versa.
  • Isolate the cables of inputs X1, M and X2 from AC 230 V mains voltage.
  • The AC 230 V mains supply line must have an external circuit breaker with a rated current of no more than 10 A.
  • Screw down all terminals regardless of whether cables are connected or not.
  • Properly size the cables to the thermostat.
  • Screw down the cables tightly and make sure no bare copper is exposed.
  • Disconnect from power supply before removing the front module and the mounting plate.
  • Use a cable lug to avoid touching of mains and neutral wires, if the power cable is made of RVS wires.