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ELECTRICAL
Power Supply / Power Wiring Specifications
Power Supply / Power Wiring Specifications
Outdoor unit(s) and indoor units must be provided power from separate breakers.
Outdoor Units
• Outdoor units are available in both 3Ø, 208-230V, 60Hz, and 3Ø, 460V, 60Hz.
• Power wiring / power wiring gauge to the outdoor unit(s) should be solid or stranded, and must
comply with all local and NEC electrical codes.
• Each outdoor unit must be provided a dedicated fused disconnect or breaker. Properly
ground each outdoor unit per NEC and local codes.
• Each outdoor unit frame in a multi-frame configuration must be provided a dedicated fused
disconnect or breaker. On multi-frame installations, ground each frame separately per NEC
and local codes.
• No matter which system is installed, power supply should not decrease or increase more
than 10% of the rated voltage.
• Power imbalance between phases cannot be greater than 2% (if it is, the lifespan of the units will be reduced).
• Position the power wiring a minimum of two (2) inches away from the communication cables to avoid operation problems caused by electri-
cal interference.
•
Do not run both the power wiring and the communication cable in the same conduit.
Indoor Units / Heat Recovery Units
• Indoor units and heat recovery units require 1Ø, 208-230V, 60Hz power, but each unit draws minimal power.
• Where permitted by NEC and local codes, multiple indoor units and heat recovery units may be powered from a single breaker.
• Service switches typically must be installed for each indoor unit and heat recovery unit.
• Ground each indoor unit and heat recovery unit separately to a solid earth ground source per NEC and local code requirements.
WARNING
• All power wiring installation must be performed by trained service providers working in accordance with local, state, and NEC regulations
related to electrical equipment and wiring, and following the instructions in this manual. Failure to do so may lead to electric shock and
bodily injury or death.
• Use specified wiring for connections, and ensure that external force is not imparted to terminal connections. If connections firmly attached,
it may generate heat and / or cause a fire, resulting in 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.
• Use the appropriate type of overcurrent protection. Generated overcurrent may include some amount of direct current, and if the appropriate
type of overcurrent protection is not installed, there is a risk of fire, electric shock, and physical injury or death.
• Ground wiring is required to prevent accidental electrical shock during current leakage, communication problems from electrical noise, and
motor current leakage.
Do not connect the ground line to the pipes. There is risk of fire, electric shock, explosion, physical injury or death.
• Install a main shutoff switch that interrupts all power sources simultaneously. There is risk of fire, electric shock, explosion, physical injury or death.
• The GND terminal at the main PCB is a negative terminal for dry contact, not a ground. Inadequate connections may generate heat, cause
a fire, and physical injury or death.
• 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. If the system operates in reversed phase, etc., it may damage the compressors and
other components.
• 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 plumb-
ing system. Failure to properly provide a National Electrical Code-approved earth ground can result in property damage and equipment
malfunction.
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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.
Outside Power Source to Outdoor Unit Termi-
nal Diagram.
208-230V, 60Hz or 460V, 60Hz
Use Copper Power Supply Wire
Power Supply to Outdoor Unit Terminals
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