Power Wiring / Communication Cable Connections - LG MULTI V ARNU073M1A4 Installation Manual

Power Wiring / Communication Cable Connections

Best practice dictates using solderless ring or fork terminals at all power wiring and communica-
tion cable terminations. Use copper bearing ring or fork terminals;
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 JIS 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 41: Proper and Improper Power Wiring Connections.
Terminate multiple power wires of
the same gauge to both sides.
WARNING
If power wires are not properly terminated and firmly attached, there is risk of fire, electric shock, and physical injury or death.
• 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
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.
• The terminals labeled "GND" are NOT ground terminals. The terminals labeled
ARE ground terminals.
• 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 indoor units (and heat recovery 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.
Power Wiring / Communication Cable Connections
do not use galvanized or
Do not overtighten the
WIRING
Figure 40: Close up of a Typical Ring
Terminal.
Ring Terminal
:Copper Wire
Do not terminate different gauge
wires to a terminal block.
Figure 39: JIS Screws.
Wiring / Cable
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