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AU482FIBHA PCB ports name and functions:
Ports name Functions
Low voltage board
CN1 Communication port
To indoor communication (forbidden to high voltage
electricity)
CN3 EEV1 To EEV
CN4 AC To CN1 of filter board, used to detect the current
CN5 TC To middle of condenser temperature sensor
CN6 Port of suction temperature sensor TS To suction temp. sensor
CN7 Port of ambient temp. sensor TA To ambient temp. sensor
CN8 Port of discharging temp. sensor TD To discharging temp. sensor
CN9 Port of defrosting temp. sensor TE To defrosting temp. sensor
CN13 ------------------ No used
CN14 Port of pressure switch To high/low pressure switch
CN15 Power port of control board
To CN11 of high voltage control board, with +12V power
supply
CN16 Control port of relay
To CN13 of high voltage control board, used to control high
voltage relay
CN18 IPM To CN1 of power module, used to control power module
CN24 ------------------ No used
High voltage board
CN1 Power supply port To 220V, 50HZ power supply, lead from front terminal block
CN3
Refrigerant spray valve
port
To refrigerant spray valve, used to decrease discharging temp.
CN4 Oxygen generator port To oxygen generator
CN5 Heater port To heater
CN6 Unloading valve port
To unloading valve, used to control by pass between suction and
discharging, decrease the pressure drop between high pressure and low
pressure
CN7 4-way valve port To 4-way valve
CN8 AC contactor port To AC contactor
CN9 Motor A port To motor A
CN10 Motor B port To motor B
CN11
+12V power supply
output port
To CN15 on low voltage board
CN12 4-way 15V output port To CN2 on power module
CN13 Control port of all relays To CN16 on low voltage board
CN14
Compressor overheat
protection port
To the overheat protector in the compressor
-134-
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