roscoe81 / aircon-controller

Raspberry Pi controller that provides the ability to control a Mitsubishi ducted air conditioner via its serial communications link so that it can be automated with the provision of temperature sensors in each room and monitoring/control of a two-zone airflow damper.

Aircon-Controller

Controller for a Mitsubishi air conditioner (Model FDC508HES3) Provides mqtt control of the airconditioner using the serial communications link that runs between Mitsubishi's RCD-H-E remote control unit and the CNB port on the air conditioner's control board. Also provides the ability to control a damper so that airflow can be directed to the correct air conditioning zone. An inclinometer is provided for the damper in order to detect its position and control the air flow between zones with greater precision.

This project requires a separate mqtt-based controller that captures the actual temperatures of each room, compares those temperatures to desired temperature levels and controls the air conditioner and damper to align the desired and actual temperatures. I've implemented such a controller as part of a more comprehensive Home Automation System.

Hardware Schematics

Hardware Photographs

Note that the damper controller switches high voltages and it should only be constructed and deployed by a licensed electrician.

Air Conditioner Communications Protocol

I've included a document that shows what I found when reverse engineering the protocol between the Mitsubishi RCD-H-E remote control unit and the CNB port on the air conditioner's main unit. There are still gaps in some areas of that protocol but all essential functions are covered.

Version 5.1 Gen

Version 5.1 Gen adds the ability to control dampers for each room and to control fan speed. Hardware changes were necessary to control each room damper.

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License

This project is licensed under the MIT License - see the LICENSE.md file for details

Acknowledgements

I'd like to acknowledge the work done by Hadley Rich who did similar work on a Mitsubishi air conditioner that provided me with the inspiration to undertake this task.

aircon-controller's Issues

Non-issue: MHI FDUA system

Hi there,

Just stumbled upon your project here and was wondering if you had any idea if it would work with a Mitsubishi Heavy Industries 'FDUA100VNP1VF2' ducted system (RC-EX controller (2 wire))?

About to check if my indoor unit has a CNB port on the main board but from memory when I installed the unit it did not as the communications were over 2 wires that also power the RC-EX3 controller.

If your project is not compatible could we possibly have a chat about possible routes I could take to get something working?

Thanks for your time.