Port and definition
CN1: indoor coil temperature sensor
CN2: connection port of detector
CN3: output port of transformer
CN4: swing port
CN5: water pump port
CN7: control port of outdoor compressor and fan motor
CN8: indoor fan motor port
CN9: input port of transformer
CN10: power input port of PCB
CN11: float switch
CN12: wired controller port
CN23: connection port of outdoor defrost sensor
CN24: control port of outdoor low pressure switch
Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
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