Daikin EKRHH Modbus for Home Assistant

Integration for the Daikin Home Hub (modbus gateway) for Altherma 3 and Air 2 Air heat pumps.

The newest release also adds experimental support for the Altherma 4 heatpump.

The latest information about the gateway can be found here: EKRHH Daikin Homepage In this document also the modbus registers can be found.

Features

• Altherma 3 and 4 support
• HomeHub Support
• Real-time monitoring of heat pump status, temperatures, and energy usage.
• Climate control (set target temperatures, modes, and fan speeds).
• Energy tracking (power consumption, efficiency metrics).
• Modbus TCP/RTU support.

Installation

HACS

1. Ensure HACS is installed in your Home Assistant.
2. Search "Daikin Modbus"
3. Click Install and restart Home Assistant.

Manually

You can install the code manually by copying the Daikin_EKRHH_Modbus folder and all of its contents into your Home Assistant's custom_components folder.

Daikin Altherma 3 settings

Working modes

EKRHH supports 3 modes.

1. Use case 1 – PV self-consumption for Daikin Altherma
2. Use case 2 - PV self-consumption for Multi+(DHW)
3. Use case 3 - Modbus RTU/IP for Daikin Altherma
4. Use case 4 - Modbus TCP/IP or RTU for air-to-air heat pump

The integration only works with use case 3 and 4.

Enabling Modbus TCP on Daikin Altherma 3

The following can be done in the ONECTA app: ▪ Add / remove the Daikin HomeHub to your home, ▪ Select a use case, ▪ Change the Modbus settings (for use case 3 and 4),

Modbus settings Modbus protocol: RTU or TCP/IP (default) In case of TCP/IP protocol, set the following: ▪ Encryption: none (default) or TLS (not tested)

You have to set it to TCP/IP for the integration to work.

Select the right port at configuration: ▪ No encryption: 502 ▪ TLS encryption: 802

On the unit it is possible to set the smart grid setting via HomeHub (if desired).

Special thanks

Special thanks to Solaredge Modbus and Daikin Onecta. A lot of this code is based off those repositories.