pymhihvac 0.1.1

Python library to interact with Mitsubishi Heavy Industries HVAC systems

pymhihvac

A Python library for controlling Mitsubishi Heavy Industries (MHI) HVAC systems via their local API using a SC-SL4 central control unit. Built especially for Home Assistant, enable the creation of climate, sensor and binary sensor entities. It can also be used standalone.

Features

• Full HVAC Control:
  • Power on/off
  • Set temperature (18-30°C)
  • Adjust fan speeds (Low/Medium/High/Diffuse)
  • Control swing modes (Auto/Stop1-4)
  • Set HVAC modes (Cool/Dry/Fan/Heat/Fan Only)
• Status Monitoring:
  • Current room temperature
  • Filter status
  • Remote control lock state
• Management
  • Filter reset
• Virtual Groups: Manage multiple units as a single entity
• Async Support: Built on aiohttp for efficient communication

Installation

pip install pymhihvac

Quick Start

import asyncio
from pymhihvac.controller import MHIHVACSystemController
from pymhihvac.device import MHIHVACDeviceData

async def main():
    # Initialize controller
    controller = MHIHVACSystemController(
        host="192.168.1.100",  # HVAC system IP
        username="admin",
        password="password"
    )

    # Login to API
    await controller.async_login()

    # Fetch raw_data devices
    raw_data = await controller.async_update_data(
      method="all",               # "all" (Default) = all valid units, "block" = "units in configured blocks"
      include_index="['1','2']",  # (Optional) The index of the blocks to include
      include_groups="['1','2']", # (Optional) The 'GroupNo' of the units to include
    )

    # Fetch all devices and virtual groups from API raw_data
    devices_data: list[
        MHIHVACDeviceData
    ] = parse_raw_data(
        raw_data_list,
        virtual_group_config,
    )

    # Control first device
    device = devices[0]
    print(f"Controlling: {device.group_name} ({device.group_no})")

    # Turn on cooling at 22°C
    await controller.async_set_hvac_mode(device, "cool")
    await controller.async_set_target_temperature(device, 22.0)

asyncio.run(main())

Configuration (Example)

Optionally you can create a YAML to store configuration and use yaml.load(...) to build a dictionary:

configuration:
  data_fetching:
    method: "all"
    include_index: ["1", "2"]
    include_groups: ["1", "2"]
  virtual_groups:
    129:
      name: "Living Room Group"
      units: ["1", "2"]  # Group numbers from physical units
    130:
      name: "Entire Floor"
      units: "all"       # Include all available units

API Reference

Core Classes

MHIHVACSystemController

Main interface for HVAC communication:

controller = MHIHVACSystemController(
    host: str,          # HVAC system IP/hostname
    username: str,      # API username
    password: str,      # API password
    session: ClientSession = None  # Optional aiohttp session
)

Key Methods:

Method	Description
async_login()	Establish API session
async_update_data()	Fetch current device states
async_set_hvac_mode(device, mode)	Set HVAC mode with auto On/Off
async_set_hvac_set_mode(device, mode)	Set HVAC mode
async_turn_hvac_on (device)	Turn HVAC on
async_turn_hvac_off(device)	Turn HVAC off
async_set_target_temperature(device, temp)	Set target temperature
async_set_fan_mode(device, mode)	Set fan speed
async_set_swing_mode(device, mode)	Set swing position
async_set_rc_lock(device,mode)	Set the RC lock mode
async_filter_reset()	Reset the Filter Signal
set_device_property(device,properties,values)	Set any properties
async_close_session()	Close the session if not passed to the controller

MHIHVACDeviceData

Dataclass representing HVAC unit/group:
@dataclass
class MHIHVACDeviceData:
    group_no: str | None          # Physical group number
    group_name: str | None        # Display name
    is_virtual: bool              # True for virtual groups
    current_temperature: float | None
    target_temperature: float | None
    hvac_mode: str | None         # Current operation mode
    fan_mode: str | None          # Current fan speed
    swing_mode: str | None        # Current swing position
    is_filter_sign: bool          # Filter needs maintenance
    rc_lock: bool                 # Remote control locked

Mode Mappings

HVAC Modes:

Home Assistant	MHI API Value
off	-
cool	2
dry	3
fan_only	4
heat	5

Fan Modes:

Home Assistant	MHI API Value
low	1
medium	2
high	3
diffuse	4

Swing Modes:

Home Assistant	MHI API Value
auto	1
stop1	2
stop2	3
stop3	4
stop4	5

Filter Sign:

Home Assistant	MHI API Value
clean	0
dirty	1

RC Lock:

Home Assistant	MHI API Value
locked	222
unlocked	111

Requirements

• Python 3.9+

• aiohttp >= 3.8.0

• voluptuous >= 0.13.0

Contributing

1. Fork the repository

2. Create a feature branch (git checkout -b feature/your-feature)

3. Commit changes (git commit -am 'Add awesome feature')

4. Push to branch (git push origin feature/your-feature)

5. Open a Pull Request

License

MIT

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Disclaimer: This project is not affiliated with or endorsed by Mitsubishi Heavy Industries. Use at your own risk. Always ensure proper HVAC system configuration before deployment.