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47
Electrical System Installation
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 INSTALLATION
• All power wiring and communication cable installation must be performed by trained service providers working in accordance with local,
state, and National Electrical Code (NEC) / UL / ETL federal regulations related to electrical equipment and wiring, and following the
manufacturer product diagrams, requirements, and instructions in this manual. Failure to do so will lead to electric shock which can cause
physical injury or death.
• Verify that main power to the unit is completely off before proceeding. Follow all safety and warning information outlined at the beginning of
this manual. Failure to do so will cause electric shock and bodily injury or death.
• Familiarize yourself with the location of the circuit breaker. Be sure that a circuit breaker or some other emergency power cutoff device is in
place before any power wiring is done to the system. Failure to do so will cause bodily injury or death.
• Never touch any power lines or live cables before all power is cutoff to the system. To do so will cause bodily injury or death.
• Undersized wiring will lead to unacceptable voltage at the unit and will cause a fire, which will cause bodily injury or death.
• Properly ground the Single Zone outdoor and indoor units. Ground wiring is required to prevent accidental electrical shock, bodily injury,
and death during current leakage.
• Ground wiring must always be installed by a trained technician.
• Install appropriately sized breakers / fuses / overcurrent protection switches and wiring in accordance with local, state, and NEC regulations
related to electrical equipment and wiring, and following the instructions in this manual. Using an oversized breaker or fuse will result in
electric shock, physical injury or death.
• Do not connect ground wire to refrigerant, gas, or water piping; to lightning rods; to telephone ground wiring; or to the building plumb-
ing system. Failure to properly provide a NEC-approved earth ground will result in electric shock, fire, physical injury or death.
• Consider ambient conditions (temperature, direct sunlight, inclement weather, etc.) when selecting, installing, and connecting the power
wiring.
• Properly ground the Single Zone outdoor and indoor unit. Improperly connected ground wire can cause communication problems from
electrical noise and motor current leakage. Ground wiring must always be installed by a trained technician.
• Install appropriately sized breakers / fuses / overcurrent protection switches and wiring in accordance with local, state, and NEC regulations
related to electrical equipment and wiring, and following the instructions in this manual. Using an oversized breaker or fuse will result in
equipment malfunction and property damage.
• Do not connect ground wire to refrigerant, gas, or water piping; to lightning rods; to telephone ground wiring; or to the building plumbing
system. Failure to properly provide a NEC-approved earth ground can result in property damage and equipment malfunction.
• Do not operate the air conditioning system until the refrigerant piping installation is complete. Operating the system before refrigerant
piping is finalized will damage the compressor.
Figure 70: Close up of a Typical Ring Termi-
nal.
Power Wiring / Communication Cable Connections
Best practice dictates using solderless ring or fork terminals at all power wiring and com-
munication 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 a Ring or Fork Terminal:
1. Trim the wiring with wire cutters or pliers, then strip the insulation to expose the strand
wiring to about 3/8 inches.
2. Using a ring terminal fastener or pliers, securely clamp a ring terminal to each stripped
wire end.
Ring Terminal
Wiring / Cable
Figure 71: Distance Between the Terminal
Connections.
>1/4
inches
Safety Guidelines
LS090-120HEV2, LS090-120HFV3, and LS090-120HXV2 indoor units and outdoor units have similar frames; however,
LS090-120HEV2 and LS090-120HFV3 systems require 208-230V, 60Hz, 1ph power supply. LS090-120HXV2 systems require
115V, 60Hz, 1ph power supply. Verify which system is being installed. An incorrect power supply will result in electric shock,
re, physical injury, or death.
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