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esp-lg-control -> Hobby project!

ESP8266 based controller for LG Therma V Monoblock Unit. Connects the LG to HomeAssistant and tries to optimise output modulation. Tested with 3-phase 14kW U34 version. So propably works at least with 12-14-16kW U34 3-phase models. May also work with 1-phase and U44 models (depending on modbus registers). But not tested.

This is a hobby project. I share this to allow other people to pick up ideas and contribute. All assistance is welcome. I will not provide support, so use at your own risk. And make sure you know what you are doing, by using this script it is possible that your unit stops functioning or breaks and you could electrocute yourself.

Whats new:

Update: Changed ant-pendel algoritm to monitor return temp. After much experimenting I have the feeling that the LG controller modulates on the return temp, not the supply temp. Update: Ditched the PID controller. Switched back to an (improved) basic algorithm.

Experimental (simple) PID controller. It works, but I am not sure if it really addes value compared to the simple algoritm. It fixes some issues (with HP not starting, because target is set too low). But there are other ways to fix that. But it is a lot of fun to experiment with.

Known limitations/ToDo:

  • Further testing on different models needed

Hardware

Works with any ESP chip/board supported by ESPHome.

In this specific config two relays are connected to GPIO Pins. These relays actuate the external thermostat connections on the LG. This config is optional, but the actuation of the relays is used to determine operation mode.

An Eneco Toon is connectend to a GPIO Pin (with pulldown resistor). The Toon Ketel Module connects this pin to a 3.3V supply to create a digital 'high' when the thermostat requests heat. This config is optional.

Modbus communication is done through a rs485 to TTL converter based on the max485 chip. I use a board with automatic flow control. You can use other boards if you like.

Installation

  • Clone repo
  • Copy config/config-example.yaml to config/config.yaml
  • Update config.yaml
  • Update secrets.yaml
  • Build

Disclaimer

This is an experimental script and in early alpha stage. This is in no way finished software and should only be used by professionals. You are using this on your own riks. Do not use if you don't have any soldering/programming experience. Pull request are welcome!