Haier AU282AHBEA Service Manual page 270

Ports on PCB functions for AU242AHBEA~AU88NATBEA
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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