LG ARUM072BTE5 Installation Manual page 108

ELECTRICAL
Communication Cable Specifications
WARNING
• Ground wiring is required to prevent accidental electrical shock during current leakage, communication problems from electrical noise, and
motor current leakage.
death.
• Never ground the shield of the communications cable to the indoor unit frame or other grounded entities of the building. Inadequate
connections may generate heat, cause a fire, and physical injury or death.
• Always verify the communication cable is connected to a communications terminal on the outdoor unit(s). Never apply line voltage power to
the communication cable connection. If contact is made, the PCBs may be damaged.
• Never use a common multiple-core communications cable. Each communications bus shall be provided a separate cable (i.e., between
outdoor unit(s) and indoor units, outdoor units and central controller(s). If communications cables of separate systems are wired using a
common multiple-core cable, it will result in a poor communications signal and unacceptable system operation.
Close up of Master Outdoor Unit to Slave Outdoor Unit(s) Communication Cable Connections.
Communications Cable Between Master Outdoor Unit and Slave Outdoor Unit(s)
r Unit
Master Outdoor Unit Communication Terminal Block
ODU
B A
ODU
B A
ODU
A
B
WARNING
The terminals labeled "GND" are NOT ground terminals. The terminals labeled
heat, cause a fire, and physical injury or death.
• Make sure that the terminals match (A to A, B to B). Maintain polarity throughout the communication network. The system will malfunction if
not properly wired.
• Do not include splices or wire nuts in the communication cable.
108
Do not connect the ground line to the pipes. There is risk of fire, electric shock, explosion, physical injury or
IDU CENTRAL DRY1 DRY2 GND
A
B B A
Slave 1 Outdoor Unit Communication Terminal Block
IDU CENTRAL DRY1 DRY2 GND
A
B B A
Slave 2 Outdoor Unit Communication Terminal Block
DRY1 DRY2 GND
IDU CENTRAL
A B A
B
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.
12 V
12 V
12 V
ARE ground terminals. Inadequate connections may generate