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Electrical Wiring Diagram

SF Frame

Figure 3: ARNU093SFA4 and ARNU123SFA4 Wiring Diagram.

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PCB Connection Purpose Function

CN-TH3 Pipe out thermistor Pipe out thermistor connection

CN-TH2 Pipe in thermistor Pipe in thermistor connection

CN-TH1 Return air thermistor Return air thermistor connection

CN-UD Step motor Step motor output

CN-LR1 Step motor Step motor output

CN-LR2 Step motor Step motor output

CN-REMO Wired remote controller Wired remote controller connection

CN-EEV EEV output EEV control output

CN-EXT1 External on/off controller External on/off controller connection

CN-CC Dry contact Dry contact connection

CN-485 Communication Connection between indoor and outdoor units

Table 3: SF Frame Wiring Diagram Legend.

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LG ARNU123SBL4 User Manual

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