Midea 170L heat pump modbus configuration

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1. Purchase a WaveShare RS485 module. The module I used is on Amazon here - https://www.amazon.com.au/Waveshare-RS485-Ethernet-Rail-Mount-Gateway/dp/B0B4JNWF7N

2. Configure the WaveShare module. In mode, you need to set Modbus TCP <=> Modbus RTU. The default username and password is admin admin

3. Connect the WaveShare module to your Midea 170L heat pump. The cables are Yellow = GND, Gray = B, Black = A.

4. Using File Editor in Home Assistant navigator to your configuration.yaml file and add this line 

modbus: !include modbus.yaml

5. Using File Editor, create a modbus.yaml file and copy the configuration above.

6. Adjust the host to match the IP address of your WaveShare module.

7. Restart Home assistant and you should now see entities with your temps.

modbus.yaml

- name: waveshare1
  type: tcp
  host: 192.168.0.48
  port: 502
  delay: 2
  timeout: 5
  switches:
    - name: water_heatpump_on_off_toggle
      unique_id: water_heatpump_on_off_toggle
      slave: 1
      address: 0
      write_type: holding
      command_on: 1
      command_off: 0
      verify:
        input_type: holding
        address: 0
        state_on: 1
        state_off: 0
    - name: water_heatpump_offEconomy_onHybrid_toggle
      unique_id: water_heatpump_offEconomy_onHybrid_toggle
      slave: 1
      address: 1
      write_type: holding
      command_on: 2
      command_off: 1
      verify:
        input_type: holding
        address: 1
        state_on: 2
        state_off: 1
  sensors:
    - name: water_heatpump_power_state
      unique_id: water_heatpump_power_state
      address: 0
      scan_interval: 5
      slave: 1
      input_type: holding
    - name: water_heatpump_mode
      unique_id: water_heatpump_mode
      address: 1
      scan_interval: 5
      slave: 1
      input_type: holding
    - name: water_heatpump_temperature_top_of_tank_T5U
      unit_of_measurement: °C
      state_class: measurement
      unique_id: water_heatpump_temperature_top_of_tank_T5U
      scan_interval: 30
      address: 101
      slave: 1
      offset: -15
      scale: 0.5
    - name: water_heatpump_temperature_bottom_of_tank_T5L
      unit_of_measurement: °C
      state_class: measurement
      unique_id: water_heatpump_temperature_bottom_of_tank_T5L
      scan_interval: 30
      address: 102
      slave: 1
      offset: -15
      scale: 0.5
    - name: water_heatpump_condensor_temperature_T3
      unit_of_measurement: °C
      state_class: measurement
      unique_id: water_heatpump_condensor_temperature_T3
      scan_interval: 30
      address: 103
      slave: 1
      offset: -15
      scale: 0.5
    - name: water_heatpump_outdoor_temperature_T4
      unit_of_measurement: °C
      state_class: measurement
      unique_id: water_heatpump_outdoor_temperature_T4
      scan_interval: 30
      address: 104
      slave: 1
      offset: -15
      scale: 0.5
    - name: water_heatpump_exhaust_gas_temperature_Tp
      unit_of_measurement: °C
      state_class: measurement
      unique_id: water_heatpump_exhaust_gas_temperature_Tp
      scan_interval: 30
      address: 105
      slave: 1
    - name: water_heatpump_suction_temperature_Th
      unit_of_measurement: °C
      state_class: measurement
      unique_id: water_heatpump_suction_temperature_Th
      scan_interval: 30
      address: 106
      slave: 1
      offset: -15
      scale: 0.5
  climates:
    - name: water_heatpump_climate
      unique_id: water_heatpump_climate
      address: 2
      slave: 1
      input_type: holding
      max_temp: 70
      min_temp: 60
      precision: 1
      target_temp_register: 2
      temp_step: 1
      temperature_unit: C

Hi!
Thanks for this… I was led here from a community post and this helped get my Midea unit in to home Assistant.

I’ve made some progress on it myself and noticed that the eco/hybrid switch could do with improvement as it didn’t also account for e-heater mode.

Anyhoo… see my version here: https://github.com/0xAHA/Midea-Heat-Pump-HA/blob/main/files/modbus.yaml