This feature allows you to control all your VTherms from a single control point. A typical use case is when you leave for an extended period and want to set all your VTherms to frost protection, and when you return, you want to set them back to their initial state.
Centralized control is done from a special VTherm called centralized configuration. See here for more information.
If you have set up a centralized configuration, you will have a new entity named select.central_mode that allows you to control all VTherms with a single action.
This entity appears as a list of choices containing the following options:
Auto: the 'normal' mode where each VTherm operates autonomously,Stopped: all VTherms are turned off (hvac_off),Heat only: all VTherms are set to heating mode if supported, otherwise they are stopped,Cool only: all VTherms are set to cooling mode if supported, otherwise they are stopped,Frost protection: all VTherms are set to frost protection mode if supported, otherwise they are stopped.
For a VTherm to be controllable centrally, its configuration attribute named use_central_mode must be true. This attribute is available in the configuration page Main Attributes.
This means you can control all VTherms (those explicitly designated) with a single control.