HA-heatmiser-component

Custom Home Assistant Component for Heatmiser PRT-N Stats This component accesses the stats via an IP to RS485 adaptor (I use an ATC_1000)

To use this custom component:

1. Create a folder heatmiser_ndc within config/custom_components folder on your HA system
2. Upload the files climate.py, heatmiser.py, manifest.json and _init_.py to the new config/custom_components/heatmiser_ndc folder
3. and then add the following (edited for your setup) to your configuration.yaml:

Example configuration.yaml

 climate:
  - platform: heatmiser_ndc
    host: 192.168.0.19
    port: 23
    scan_interval: 20
    tstats:
      - id: 1
        name: Kitchen
      - id: 2
        name: Guest Bath
      - id: 3
        name: Guest Bed
      - id: 4

Notes

This version has been derived from the original Heatmiser component and the HeatmiserV3 library. The library has been incorporated into this custom component (heatmiser.py) to add logging and fix a few issues.

Update speed

My own heatmiser system has 15 stats connected via a single ATC_1000 RS485 adaptor.

There is a COM_TIMEOUT in heatmiser.py (currently 0.8 secs), so it takes c12 seconds to update all stats. This works fine on my own system, but if you have lots of CRC errors reported in the log, then it may be worth increasing this a little to say 1 second or more.

Hass includes the first update as part of initialisation, so with this many stats, it will take longer than 10 seconds, so a warning is to be expected, along the lines of "Setup of climate platform heatmiser_ndc is taking over 10 seconds".

The configuration parameter scan_interval determines how frequently Hass reads the stat values after scan_interval seconds. The shorter this interval, the more quickly Hass will detect changes in temperature or heating mode. The fewer stats you have, the smaller this interval can be.

Hvac modes

The component now supports 3 HVAC MODES - "Auto", "Heat" and "Off" and implements the climate services Turn on, Turn off & Set Hvac Mode. Turn off sets the stat into frost protect mode, Turn on sets it to normal (ie heating if actual temp < target temp)). Set Hvac mode on or off is the same as turn on / turn off. The modes can be controlled from the UI, or by calling the relevant services from developer tools. Setting mode to "Auto" or "Heat" has the same effect - the resulting mode in the stat will depend on the current temp.

Frost Protect temp

The standard climate component supports a humidity level (while the heatmiser stat does not). So the code now allows the frost protect temp to be read and modified via the humidity level. It accepts values in the range 7 to 17 as per the PRT stat.

Logging

The component logs lots of events at debug, error, info & warning levels. Logging levels can be controlled by including something like the following in the configuration.yaml file

logger:
  default: warning
  logs:
    custom_components.heatmiser_ndc: debug

Logging can also be controlled at the module level within the component

logger:
  default: warning
  logs:
    custom_components.heatmiser_ndc.climate: debug
    custom_components.heatmiser_ndc.heatmiser: info
   

Logging can also be controlled on the fly using the logger.set_level service in Developer Tools in the UI in Yaml mode with

service: logger.set_level
data:
  custom_components.heatmiser_ndc: warning