Tomgru,
My understanding is that the Fujitsu's can either be controlled by an IR remote or through a hardwired connection into the unit (or both if you want to have the option). The Wi-Fi adapter connects to the same hardwire connections as your thermostat (I'm assuming each one is wired through the wall to an AC unit). I'm not sure if you can have both connected at the same time or have to pick between Wi-Fi or a wall thermostat. In my setup, the previous owner just used the IR remotes and there was no wiring run for thermostats. So I had the Wi-Fi modules installed.
For the plug-in to work, you will need the Wi-Fi unit as it is the way the data gets sent to the Fujitsu servers. It is possible of course that the thermostats you have are Wi-Fi capable and also link up to the cloud (or perhaps there are models that do if the ones they have now don't). Check the manual for them if possible to see about that. If you have a model number for the thermostats I can poke around and see if they have that support or have other models that do. The key ultimately will be if you can control your AC units thru the FGLair app. If you can, the plug-in will work. If you have no access through the app, the plug-in won't be able to work either. It doesn't use the app of course but it uses the same backend data interface as the app does.
On the outdoor units, I have 5 AC head units in the house but only 2 outdoor compressor units that service all of them. Each indoor unit is entirely separate from the others and is effectively its own zone (e.g., turning on one, changing its settings, … has no impact on any others). They are wired back to the compressor outdoors to turn it on when any or all of them need it running. I think it is pretty common that you would have more indoor units than the outdoor ones.
If you have any info about your thermostat, I'd be happy to see if I can figure out anything about it to see if it might work. All of the plug-in control is done through their cloud service, not on the local LAN so that Wi-Fi capability needs to be there one way or the other.
-XM
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