LMCN078HV Engineering Manual
• Secure the separate wires in the control box panel using zip ties.
• Secure wiring with accessory clamps so that it does not touch piping.
• Use a conduit for the cable.
• Outside the unit, make sure the communications cable / power wiring are separately shielded, otherwise, the outdoor unit operation will be
affected by electrical noise and will malfunction or fail.
• For details on the Multi F with LG RED and Multi F MAX with LG RED units, refer to the engineering manuals on www.lghvac.com.
General Information
ELECTRICAL CONNECTIONS
Figure 257:Typical Multi F System General Power / Communications
System Schematic When Wiring is Less Than 130 Feet.
Figure 258:Typical Multi F MAX System General Power / Communica-
tions System Schematic When Wiring is Less Than 130 Feet.
Power Supply
Circuit Breaker
Indoor Unit
Branch Distribution Unit
Ground Wiring
Outdoor Unit
Branch Distribution Unit
Indoor Units
Power Supply
Circuit Breaker
Ground Wiring
Outdoor Unit
Figure 259:Schematic of a Multi F System When the Wiring is GREATER THAN 130 Feet.
Figure 260:Schematic of a Multi F MAX with LGRED System When the Wiring is GREATER THAN 130 Feet.
Power
Supply
1(L1) (Power, L)
2(L2) (Neutral, N)
G (Ground)
Power Flow: L → N
Diagram is an example of communication and power
cables when the wiring is GREATER THAN 130 feet.
Terminals may be labeled differently depending on the model.
Outdoor and Indoor Unit appearances may vary depending on the model.
Communication Flow: Comm → N
3 (Communications)
GREATER THAN 130 feet: Must Separate Communications and Ground (G) Cable from the Power
(1[L1]) and Neutral (2[L2]) Cable at Least Two (2) Inches for Each Indoor Unit
At Least Two (2) Inches
3 (Communications)
At Least Two (2) Inches
Power
Supply
1(L1) (Power, L)
2(L2) (Neutral, N)
G (Ground)
Power Flow: L → N
Diagram is an example of communication and
power cables when the wiring is GREATER THAN
130 feet. Terminals may be labeled differently depending on the model.
Outdoor and Indoor Unit appearances may vary depending on the model.
Communication Flow: Comm → N
3 (Communications)
GREATER THAN 130 feet: Must Separate Communications and Ground (G) Cable
from the Power (1[L1]) and Neutral (2[L2]) Cable at Least Two (2) Inches for Each
Indoor Unit.
At Least Two (2) Inches
3 (Communications)
At Least Two (2) Inches
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
WIRING CONNECTIONS | 209
Wiring Connections
MULTI
F
MAX
MULTI
F