Engineering Manual

General Information
ELECTRICAL CONNECTIONS
• All power (line voltage) wiring and communication cable installation must be performed by trained service providers working in accordance
with all 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. Electric shock can cause physical injury or death.
• Be sure 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 may cause electric shock and bodily injury.
• Install a main shutoff switch or circuit breaker that interrupts all power sources simultaneously (circuit breaker should be resistant to electro-
magnetic currents). Be sure that the 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 may cause bodily injury or death.
• Never touch any power lines or live cables before all power is cutoff to the system. To do so may cause bodily injury or death.
• Power wiring and communication cable sizes must comply with all applicable federal, state, and local codes. Undersized wiring may lead to
unacceptable voltage at the unit and may cause a fire, which may cause bodily injury or death.
• Properly ground the outdoor unit, indoor units, and branch distribution units. Ground wiring must always be installed by a trained technician.
Ground wiring is required to prevent accidental electrical shock during current leakage, which may cause bodily injury or death.
• Verify that the branch switch and circuit breaker are set to OFF before installing the wiring system. Electric shock can cause physical injury
or death.
• 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. Generated overcurrent may include some amount of
direct current. Using an oversized breaker or fuse may result in electric shock, physical injury or death.
• Do not connect ground wire to refrigerant, gas, sewage, 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 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 outdoor unit, indoor units, and branch distribution units. Ground wiring must always be installed by a trained technician.
Improperly grounded wire can cause communication problems from electrical noise, and motor current leakage.
• 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. Generated overcurrent may include some amount of
direct current. Using an oversized breaker or fuse may 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 may damage the compressor.
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
204 | WIRING CONNECTIONS
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
F
MAX
MULTI
F