Integration to read values from Waterkotte Resümat CD4 (Version 8126) and have them available in Home Assistant (HA).

I am using this on Waterkotte AI1 5006.4 and it is connected via USB-Serial-Port Converter.

The logic is implemented via Node-Red so you will need to install the following modules on your HA installation:

• node-red-contrib-home-assistant-websocket
• node-red-contrib-buffer-parser
• node-red-node-serialport
• node-red-show-value

The Node-Red flow reads all the values every 2 min (but you can adjust) and you can control the following:

• Heating on/off (02.00 Handabschaltung)
• Cooling on/off (03.00 Abschaltung)
• Hot watter on/off (04.00 Abschaltung)
• Heating temperature (02.02 Hzg Ruecklauf Sollwert am Einsatzp.)
• Cooling temperature (03.02 Ruecklauftemp. Sollwert am Einsatzzeitp.)
• Hot watter temperature (04.04 Warmwasser Soll)
• Synchronize time and date

How it looks like:

Node-Red:

Home Assistant:

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NOTE: You are using this at your own risk.