LG ARUN363DDA4 Installation Manual page 28

Power Wiring / Communication Cable
Connection
Best practice dictates using solderless ring or fork
terminals at all power wiring and communication cable
terminations. Use copper bearing ring or fork terminals;
Do not use galvanized or nickel 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; over
tightening will damage the terminal
Figure 10: Typical Ring Terminal
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 11: Proper & Improper Power Wiring Connections
WARNING
If power wires are not properly terminated and firmly attached,
there is risk of fire, electric shock, and physical injury or death
Note:
•
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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Due to our policy of continuous product innovation, some specifications may change without notification.
Terminal Connections
LG uses a "JIS" type of screw for all terminals; us a JIS
screwdriver to tighten and loosen these screws and void
damaging the terminal Do not overtighten 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
terminal block
Figure 12: JIS screw
Note:
•
All wiring to the unit must be drawn through one of the pre-
punched holes in the bottom 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 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
ARE ground terminals.
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