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Eurotronic Comet

The Eurotronic Comet Zigbee TRVs (COZB0001, CoZB_dha) can be used with self-regulation by direct valve control.

Zigbee2MQTT settings

Set trv_mode to 1 in Zigbee2MQTT. In this mode, the valve is controlled directly with valve_position: the display shows the valve opening and the buttons of the TRV are disabled. With the default value 2, the TRV regulates on its own and ignores valve_position.

The TRV can switch back to automatic mode on its own: check trv_mode if the valve stops following VTherm.

Maximum opening

valve_position ranges from 0 (closed) to 255 (fully open), not from 0 to 100. Set the maximum opening (max_opening_degrees) to 255 so that VTherm uses the full range of the valve. With a maximum of 100, the valve would never open more than about 40 %.

Device configuration

Initialization

Go to your settings, then integrations, then click on add a new integration. Search for Versatile Thermostat.

Click on Thermostat over another thermostat.

Basic attributes

Go to the "Main attributes" section.

  1. Choose a name for your thermostat
  2. Set the temperature sensor for your room
  3. If you are using the Zigbee protocol and you have a "last_seen" entity for your temperature sensor, fill it in.

You can validate and return to the configuration menu.

Underlying entities

Go to the underlying entities section.

  1. Add the thermostats that will be controlled
  2. In the auto-regulation section, choose "direct valve control"

You can validate and return to the configuration menu.

Community references