WireMap
All units
Mini-split230 V 1Ø at outdoorSerial comm (not 24 V)R-410A

Ductless mini-split — 12k heat pump

Inverter compressor, interconnect 1/2/3, no 24 V thermostat. Indoor is powered from outdoor. Do not land R/Y/G/W on this machine.

Indoor
Wall cassette, DC fan, EEV
Outdoor
Inverter condensing unit
Indoor head — wall cassetteOutdoor — inverter condensing unitHandset / IRNo 24 V R/Y/G/WIRIndoor PCBDisplay · sensors · fanIR123FANEEVIndoor DC fanCross-flow+−EEVElectronic expansionDRVRoom / pipe sensorsNTC thermistorsSOutdoor disconnect230 V L1 / L2L1L2L1L2Outdoor inverterRectifier · IPM · MCUL1L2UVWFANRV312Inverter compressorU V W 3-phaseUVWGNDOD DC fanPWM from inverter+−GND4-way valveHeat = coil on (typical)RVInterconnect 1 2 3Power + comm123123EGCGND

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Pick a sequence to watch voltage travel the circuit.