Systemair SAVE VSR 300 configuration

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Hi everyone! :waving_hand:

I wanted to share my Home Assistant configuration for integrating Systemair SAVE VSR 300 ventilation units (and compatible SAVE series models) using the Elfin EW11A RS485-to-Wi-Fi converter.

If you don’t want to buy expensive proprietary gateways, this $10 module combined with Home Assistant’s native modbus integration works fast, reliably, and fully locally.

:electric_plug: Hardware Setup

  • Recuperator: Systemair SAVE VSR 300 (Connection Board CB)
  • Converter: Elfin EW11A (RS485 to Wi-Fi)
  • Wiring: RS485 (A+, B-, GND) connected directly to the CB terminals.

###HA setup: just use this integration from HACS: GitHub - Howard0000/home-assistant-systemair-modbus: Home Assistant integration for Systemair SAVE ventilation units via Modbus TCP (NO/EN). · GitHub

:file_folder: Repository & Configuration

You can find the full YAML configuration, Elfin EW11 settings, and register mappings on my GitHub:
:backhand_index_pointing_right: GitHub: Elfin-EW11A-VSR-300-HOME-ASSISTANT

Maybe it will help someone :wink: