26
Split Compact Dedicated Outdoor
Air System 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.
ELECTRICAL SYSTEM
Main Power Wiring
Split Compact DOAS units use a 208-230V, 1-phase, 60 Hz power source; the nameplate as well as the Electrical Data table in the Engi-
neering and Installation Manuals lists the MCA. The main power wiring to the unit (field supplied) should be sized accordingly, and proper
connections must be followed.
Communication Cable
Communication cable from outdoor unit to DOAS unit to be minimum 18 AWG, 4-conductor, twisted, stranded, shielded and must comply with
applicable local and national codes. Ensure the communication cable is properly grounded at the outdoor unit only.
Do not ground the
outdoor unit - DOAS unit communication cable at any other point.
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Best practice dictates using solderless ring or fork terminals at all power wiring and communi-
cation cable terminations. Use copper bearing ring or fork terminals;
do not use galvanized
or nickle plate over steel. Use appropriate crimping tool to attach the ring or fork terminals at all
power wiring and control cable terminations. To install:
• Firmly attach the wire; secure in a way to prevent external forces from being imparted to the
terminal block.
• Use an appropriately sized screwdriver for tightening the terminals.
•
Do not overtighten the connections; overtightening will damage the terminals.
If ring terminals or fork terminals are not available, then:
•
Do not terminate different gauge wires to the power terminal block. (Slack in the wiring will generate heat.)
• When terminating wires of the same thickness, follow the instructions demonstrated in the figures below.
Ring Terminal
Wiring / Cable
Figure 12: Typical Ring Terminal.
:Copper Wire
Terminate multiple power wires of
the same gauge to both sides.
Do not terminate two wires on
one side.
Do not terminate different gauge
wires to a terminal block.
Figure 13: Proper and Improper Power Wiring Connections.
•
Never apply line voltage power to the communications cable terminal block. If contact is made, the PCBs will be damaged.
• Always include some allowance in the wiring length when terminating. Firmly attach the wiring or cable, but provide some slack to facilitate
removing the electrical panels while servicing, and to prevent external forces from damaging the terminal block.
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WARNING
Wiring / Connections
Terminal Connections
LG uses a “JIS” type of screw for all terminals; use a JIS screwdriver to tighten and
loosen these screws and avoid damaging the terminal.
Do not overtighten the
connections — overtightening will damage the terminals — but firmly and securely at-
tach the wiring in a way to prevent external forces from being imparted to the terminal
block.
Figure 14: JIS Screws.
