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Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Standard Wall-Mounted
SJ and SK Frames
Figure 92: ARNU053~153SJA4 and ARNU183-243SKA4 Wiring Diagram.
Table 20: SJ and SK Frame Wiring Diagram Legend.
*To enable Generation 4 features, outdoor unit DIP switch no. 3 must be set to ON. Please refer to the Multi V 5, Multi V IV, Multi V Water IV, Multi V
S Engineering Manual for additional information.
PCB Connection Purpose Function
CN-POWER AC power supply AC Power line input for indoor controller
CN-MOTOR Fan motor output Motor output of BLDC
CN-EEV EEV output EEV control output
CN-U/D Step motor Step motor output
CN-DISP2 Display Display of indoor status
CN-DISP1 Display Display of indoor status
CN-CC Dry contact Dry contact connection
CN-EXT1 External ON / OFF controller External ON / OFF controller connection
CN-485 Communication Connection between indoor and outdoor units
CN-REMO Remote controller Remote control connection
CN-LEAK Refrigerant leak detector Refrigerant leak detector connection
CN-TH3 Float switch Float switch connection
CN-TH1 Return air and inlet pipe thermistor Return air and inlet pipe thermistor connection
CN-TH2 Outlet pipe thermistor Outlet pipe thermistor connection
CN-PTC Auxiliary heater Auxiliary heater connection
CN-WF Wi-Fi module Wi-Fi module connection
ELECTRICAL WIRING DIAGRAM
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