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Power Wiring / Communication Cable Connections, Terminal Connections
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;
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.
Figure 25: Proper and Improper Power Wiring Connections.
Terminate multiple power wires of
the same gauge to both sides.
WARNING
•
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.
Terminal Connections
LG uses a "JIS" type of screw for all terminals; use a JIS screwdriver to tighten and
loosen these screws and
the connections — overtightening will damage the terminals — but firmly and securely
attach the wiring in a way to prevent external forces from being imparted to the termi-
nal block.
• All wiring to the unit must be drawn through one of the pre-punched holes in the bot-
tom of the floor pan immediately underneath the control center or through a field-cut
hole in the side of the unit casing.
• The terminals labeled "GND" are NOT ground terminals. The terminals labeled
• Polarity matters. Always connect "A" to "A" and "B" to "B."
• Always create a wiring diagram that contains the exact sequence in which all the DOAS units are wired in relation to the outdoor unit.
•
Do not include splices or wire nuts in the communication cable.
Do not terminate two wires on
one side.
avoid damaging the terminal.
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 INFORMATION
do not use galvanized
:Copper Wire
Do not terminate different gauge
wires to a terminal block.
Figure 26: JIS Screws.
Do not overtighten
ARE ground terminals.
Figure 24: Typical Ring Terminal.
Wiring / Cable
Ring Terminal
33
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