CN1：second side of transformer
CN2：high pressure switch
CN3
：outdoor ambient temperature sensor
CN4：primary side of transformer
CN5：control port of 4-way valve
CN6
：control port 2 of compressor（not available for some models)
CN7
：control port 2 of compressor 1
CN8
：control port 2 of fan motor (not available for some models)
CN9：control port 1 of fan motor
CN10：low pressure switch
CN11：compressor discharging temp. sensor
CN12: outdoor coil temperature sensor
S：connection port for communication between indoor and outdoor
L1、L2、L3：power supply terminal(herein, no L2, L3 for single phase compressor)
N：port for neutral wire
TEST
：port for compulsory running, herein, on ZR side, short connecting the two pins
can enter the compulsory heating; on ZL side, short connecting the two pins can enter
the compulsory cooling.
CT1
：current detector
LED1
：outdoor LED
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Ports on PCB functions for AU242AHBEA~AU88NATBEA
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