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Ports Ports name Wiring method
R, S, T Power supply ports To power of 3 PH, 380V, 50Hz
U, V, W Compressor ports To motor (pay attention to phase sequence)
E Grounded port
Grounding (less than 10Ω;more thanφ1.6mm)
N Neutral wire port
If 3 phase, it is connected to neutral wire; if 1
phase, it is blank.
L1, L2 Reactance port To wire of reactance (non-polar)
CN102 Current transducer port To current transducer
CN211, CN212 Fan motor port To fan motor
CN205 Water pump port To water pump (be spare)
CN206 Electric heater port To electric heater
CN207 Solenoid valve port To solenoid valve
CN208 Solenoid valve port To solenoid valve
CN209 Four-way valve port To four-way valve
CN210 Oxygen generator port To oxygen generator (blank temporarily)
CN303 Testing board port
To testing board. Used to modify, check data for
after sale personnel.
CN304 Communication port To C1, C2 of communication block
CN307, CN308
Fan motor port for dispersing
heat
To fan motor for dispersing heat (be spare)
CN310 EEV port To outdoor electronic expansion valve
CN311 Radiator temp. sensor port To radiator temp. sensor (blank temporarily)
CN312
Mid-condenser temp. sensor
port
To mid-condenser temp. sensor
CN313 Defrosting temp. sensor port To defrosting temp. sensor
CN314 Ambient temp. sensor port To ambient temp. sensor
CN315 Suction temp. sensor port To compressor suction temp. sensor
CN316 Discharging temp. sensor port To discharging temp. sensor
CN317 Low pressure switch port To low pressure switch
CN318 High pressure switch port To high pressure switch
AU48NFIBIA PCB ports name and functions
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