Ports Ports name Wiring methodR, S, T Power supply ports To power of 3 PH, 380V, 50HzU, 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 1phase, it is blank.L1, L2 Reactance port To wire of reactance (non-polar)CN102 Current transducer port To current transducerCN211, CN212 Fan motor port To fan motorCN205 Water pump port To water pump (be spare)CN206 Electric heater port To electric heaterCN207 Solenoid valve port To solenoid valveCN208 Solenoid valve port To solenoid valveCN209 Four-way valve port To four-way valveCN210 Oxygen generator port To oxygen generator (blank temporarily)CN303 Testing board port To testing board. Used to modify, check data forafter sale personnel.CN304 Communication port To C1, C2 of communication blockCN307, CN308 Fan motor port for dispersingheat To fan motor for dispersing heat (be spare)CN310 EEV port To outdoor electronic expansion valveCN311 Radiator temp. sensor port To radiator temp. sensor (blank temporarily)CN312 Mid-condenser temp. sensorport To mid-condenser temp. sensorCN313 Defrosting temp. sensor port To defrosting temp. sensorCN314 Ambient temp. sensor port To ambient temp. sensorCN315 Suction temp. sensor port To compressor suction temp. sensorCN316 Discharging temp. sensor port To discharging temp. sensorCN317 Low pressure switch port To low pressure switchCN318 High pressure switch port To high pressure switchAU48NFIBIA PCB ports name and functions-148-