49
Wiring
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.
WIRING
Outdoor Unit Power Wiring and Cable Connections
• For power wiring, use solid or stranded that must comply
with all local and national electrical codes.
• Connect the communications cable between indoor units
using a daisy chain configuration only. “Star” or “home run”
control wiring connections involving soldering or wire caps
are not permitted.
• For communications cable, use 18 AWG, two-conductor,
stranded, shielded or unshielded. If shielded, must be
grounded to the chassis at the outdoor unit only.
• Provide separate conduits for control wiring and power
wiring.
• Power and communications cables must not be routed
in the same conduit and must be routed in a manner that
keeps them a minimum of two (2) inches apart.
• Connect outdoor unit terminal IDU-A to the odd numbered
indoor unit terminal. Terminal “A” on the indoor units may
be tagged 3(A) or 5(A).
• Connect outdoor unit terminal IDU-B to indoor unit termi-
nal “B”. Terminal “B” on the indoor units may be tagged
3(B) or 5(B).
• 0D[LPXPDOORZHGOHQJWKRILQGRRUXQLWFRPPXQLFDWLRQ
cable is 984 feet.
Figure 57: Communications Wiring Terminals.
1
2
3
4
5
6
7
8
9
10
GND
Fan Only/Cool/Heat Selector
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ride of microprocessor selected
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cooling, or fan only
Central Control and Building
Automation System Communi-
FDWLRQ%XV&RQQHFWLRQ²&RQ-
nect LG Central Controller
DQG%06JDWHZD\SURGXFWV
,QGRRU8QLWV²&RPPXQLFDWLRQ
Bus Connection
1RWXVHGZLWK0XOWL96
1 2 V
Power source for
selected controllers
Ground
SODU-B
DRY 2
DRY1
Internet A
Internet B
IDU-A
IDU-B
SODU-A
Detail of the Power Wiring and Communications Cable Connections
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