Remote sensor with Mitsubishi CN105 heatpump

Mitsubishi heatpumps equipped with the CN105 internal connector support reading temperature values from remote sensors. The advantage of this feature is that a remote sensor can be placed more optimally in the room to get information about the real temperature.

The Mitsubishi CN105 Climate component supports this feature by providing actions and lambdas to update the hardware with values from any temperature sensor available in ESPHome.

The following is a possible configuration to implement this. Some heatpumps require frequent temperature updates to prevent from falling back to their internal sensor, update_interval and force_update take care of this. The filters are to guard from failing sensors - that’s when one would still want to continue operation, based on the internal sensor. The select offers the possibility to choose at run time between which temperature source to use with the heatpump.

climate:
  - platform: mitsubishi_cn105
    id: ac
    ...

sensor:
  - platform: ...
    id: my_temp
    ...
    accuracy_decimals: 1
    update_interval: 10s
    force_update: true
    filters:
      - filter_out: nan  # occasional NaNs are OK
      - timeout: 1800s  # sent value will be NaN after this amount of time to guard from sensor failures
    on_value:
      - if:
          all:
            - select.is:
                id: sel_temp
                options: "External"
            - lambda: return (!isnan(x));
          then:
            - climate.mitsubishi_cn105.set_remote_temperature:
                id: ac
                temperature: !lambda 'return x;'
          else:
            - climate.mitsubishi_cn105.clear_remote_temperature:
                id: ac

select:
  - platform: template
    id: sel_temp
    name: "Temperature Source"
    optimistic: true
    restore_value: true
    options:
      - Internal
      - External
    initial_option: "Internal"
    on_value:
      - if:
          condition:
            select.is:
              id: sel_temp
              options: "Internal"
          then:
            - climate.mitsubishi_cn105.clear_remote_temperature:
                id: ac
      - if:
          condition:
            select.is:
              id: sel_temp
              options: "External"
          then:
            - climate.mitsubishi_cn105.set_remote_temperature:
                id: ac
                temperature: !lambda 'return id(my_temp).state;'

Remote sensor with Mitsubishi CN105 heatpump

See Also