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Climate & Heating (WHO = 4)

The MyHOME integration provides full control for heating, cooling, central thermoregulation units, and zone thermostats operating on OpenWebNet WHO = 4.

In v2, setup and management are 100% UI-first: climate zones and central units are automatically discovered over the SCS bus without manual YAML configuration files.

🚀 Auto-Discovery

When your gateway connects to Home Assistant:

  1. Dynamic Bus Discovery: The integration listens to OpenWebNet WHO = 4 temperature and setpoint messages broadcast on the SCS bus.
  2. Entity Creation: Each active thermoregulation zone (WHERE = 1..99 or central unit #0) is registered as a Home Assistant climate entity linked to your gateway.
  3. UI Customization: You can rename the zone, assign it to an Area (e.g. Master Bedroom, Living Room), and adjust temperature step increments directly in the Home Assistant UI.

🏛️ Supported Plant Architectures

MyHOME installations typically deploy one of three climate topologies, all natively supported by the v2 discovery engine:

1. 99-Zone Central Unit Architecture

  • Hardware: Central thermoregulation unit (BTicino 3550, MyHOME_Screen 10, or MyHOME_Screen 3.5) operating at master address WHERE = #0.
  • Subordinate Zones: Individual room zones (WHERE = 1..99) driven by F430/2 or F430/4 flush/DIN actuators.
  • Operation: The integration discovers the central unit as the master climate entity and each individual zone as a controllable climate device. Commands issued to room zones are synchronized through the central unit.

2. 4-Zone Central Unit Architecture

  • Hardware: BTicino HC4695, L4695, or LN4695 4-zone master display panel.
  • Operation: The master panel acts as Zone 1 (or its assigned zone number) while coordinating up to three subordinate zones.

3. Standalone Probes (No Central Unit)

  • Hardware: Autonomous room thermostats (BTicino H4691, LN4691, L4692) acting as independent temperature controllers without a master central display.
  • Operation: Each thermostat is exposed directly as an independent climate entity with full target setpoint and mode control.

🌡️ Push-Driven Secondary Probes (WHERE ≥ 100)

In plants with secondary temperature sensors (e.g. BTicino 3455 radio probes connected via L4577 radio interfaces), sensor addresses have 3 digits (e.g. WHERE = 105 corresponds to the first secondary probe of Zone 5).

  • Push-Driven Telemetry: These battery-powered or radio sensors broadcast their temperature updates periodically on the SCS bus and actively reject direct poll requests.
  • v2 Quiet Listening: The v2 climate engine recognizes secondary probe addresses, operates in receive-only mode, and suppresses redundant polling to prevent gateway NACKs.

🎛️ Supported Features & HVAC Modes

MyHOME climate entities support standard Home Assistant climate controls:

  • HVAC Modes:
  • heat: System active in heating mode.
  • cool: System active in cooling / air-conditioning mode.
  • auto: Following scheduled setpoint or central program.
  • off: System frost-protection or thermal shutdown.
  • Target Temperature: Adjustable setpoint slider in 0.5 °C increments.
  • Current Temperature: Real-time ambient reading reported by the probe.

🔄 Legacy YAML Note

Note

If you are upgrading from legacy v0.9 installations and still have manual climate: blocks in /config/myhome.yaml, please refer to the v0.9.4 Legacy Climate Documentation or the Legacy YAML Migration Guide. In v2, climate zones are auto-discovered dynamically.