What I learned from Acuario's thread is that my assumption about the "s" wire using a variable voltage signal is dead wrong. It is almost certainly a serial data stream. Several guys on that thread are working on decoding and reverse engineering it. If they are successful that will open the door for some beautiful hacks.
I'm currently contemplating a simpler approach involving getting a suitable indoor unit and chopping the evaporator core and fan out of it. Then brazing in a refrigerant to water heat exchanger. This would allow me to use the OEM control card and temperature probes etc. and not have to decipher the language to get the correct function.
Does anyone have thoughts on this approach?
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