Ventilation Controller

ESPHome configuration for Tecalor Ventilation

Required Hardware

• A relay board like this: https://amzn.eu/d/0c0mSOhx
• A length of Cat5/6 cable
• Optional: Electronics box to house the relay board in.

Flash Esphome using the template

• Obtain a USB to 3.3v TTL serial programmer
• Connect the pins:
  • GND to GND
  • 3.3v to 3.3v on the board (not to 5v pin)
  • TX to RX
  • RX to TX
• Open ESPhome in a Chrome-based browser (Google Chrome / MS Edge)
• Use the ESPhome interface to prepare the board
  • Select Generic ESP32
  • Enter your wifi credentials
  • Upload the initial firmware
  • The board should now appear ONLINE in the ESPhome interface
• Copy the relevant parts of the ventilation-controller.yaml config to your ESPhome config (make sure the wifi credentials are correct)
• Upload the new config wirelessly to the board
• Add the board to Home Assistant
• Switch off the ventilation initially from the Techalor Control panel
• Enjoy controlling the house ventilation from Home Assistant

Connect the board

Connect the relay board to the Tecalor module:

• Relay 1 NO to 'Betriebsart' pin
• Relay 2 NO to 'Stufe 0/1' pin
• Relay 3 NO to 'Stufe 2' pin
• Relay 4 NO to 'Stufe 3' pin
• All Relays COM terminals together and to 'Schalter' pin
• Use 24V DC and GND from the ventilation power supply to power relay board.