CN1：control port for fan motor
CN2
：connection port for operation panel
CN3: port for sensor
CN5: primary side of transformer
CN6: secondary side of transformer
CN7
：not used
CN8
：not used
CN9: not used
CN10
：fresh air port (not used)
CN11
：distant remote control, optional
CT2: current detector
N
：neutral wire port
S(N-W)
：connection port for communication between indoor and outdoor
XT1
、XT2：testing port
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Ports on PCB functions for cabinet indoor units
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