Heltun Z-Wave Fan Coil Thermostat and Daikin Airco

hi Friends,
first of all happy new year to you and your family.
I have a Heltun Z-Wave Fan Coil Thermostat (https://www.heltun.com/z-wave-fan-coil-thermostat) and 3 Daikin Airco. They are all visibel in home assistant.

I want to use the thermostat to control all the aircos at the same time as they are all in the same room.
I am a little bit lost. Can you help me in starting this or direct me where to start ?

Thank you for your advice

Hans