Electrical Wiring; General Guidelines - LG LMCN077HV Installation Manual

ELECTRICAL WIRING

General Guidelines

• All power wiring and communication cable installation must be performed by authorized service providers working in accordance with local,
state, and National Electrical Code regulations related to electrical equipment and wiring, and following the instructions in this manual.
• 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.
• 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 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.
• Undersized wiring may lead to unacceptable voltage at the unit and may cause unit malfunction and be a fire hazard.
• Properly ground the outdoor, indoor, and branch distribution (Multi F MAX systems only) units. Ground wiring is required to prevent acciden-
tal electrical shock during current leakage.
• Ground wiring must always be installed by a qualified technician.
• Install appropriately sized breakers / fuses / overcurrent protection switches and wiring in accordance with local, state, and National Electri-
cal Code regulations related to electrical equipment and wiring, and following the instructions in this manual. Using an oversized breaker or
fuse may 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 plumbing
system. Failure to properly provide a National Electrical Code-approved earth ground can result in electric shock, physical injury or death.
Note:
• Consider ambient conditions (temperature, direct sunlight, inclement weather, etc.) when selecting, installing, and connecting the power wiring.
• Properly ground the outdoor, indoor, and branch distribution (Multi F MAX systems only) units. Improperly ground wire can cause communi-
cation problems from electrical noise and motor current leakage. Ground wiring must always be installed by a qualified technician.
• If the system operates in reversed phase, it may damage the compressors and other components.
• If there is a possibility of reversed phase, phase loss, momentary blackout, or the power goes on and off while the system is
operating, install a field-supplied phase loss protection circuit.
• Install appropriately sized breakers / fuses / overcurrent protection switches and wiring in accordance with local, state, and National Electri-
cal Code regulations related to electrical equipment and wiring, and following the instructions in this manual. 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 National Electrical Code-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.
• Use ring terminals to attach the wiring. Verify that all power wiring and communications cable terminals are securely attached. Ensure
enough slack is included in the wiring and cables to avoid damaging the connections.
• Use a conduit to protect the power wiring.
Multi F / Multi F MAX System Power Wiring and Communications Cable
For both Multi F and Multi F MAX systems, line voltage is wired to the outdoor unit only. The outdoor unit will supply power to the branch
distribution units (Multi F MAX systems only) and the indoor units through the power wiring / communications cable.
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