47
Electrical System Installation
Due to our policy of continuous product innovation, some specifications may change without notification.
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ELECTRICAL SYSTEM INSTALLATION
• LG Single Zone VAHU systems operate at 1Ø, 208-230V,
60Hz.
• Power wiring / power wiring gauge to the outdoor unit(s) must be
solid or stranded, and must comply with all National Electrical Code
(NEC), UL, and local electrical codes.
• The indoor unit is powered by the outdoor unit.
• Power supply, wire types and sizes, and circuit breaker must be
selected based on NEC, UL, and local codes. Maximum allowable
voltage fluctuation ±10% or nameplate rated value.
• Properly ground the outdoor unit and indoor unit per NEC, UL, and local codes.
• Ground wire must be longer than the common power / communication wires.
• Connect the wiring firmly so the wires cannot be easily pulled out.
• Refer to the inside of the chassis cover or control cover for circuit and terminal block diagrams.
• Always match color codes of each wire and follow wiring diagram.
•
Do not install power wiring to the outdoor unit and the communication / connection (power) cable to the
indoor unit in the same conduit. Use separate conduits.
Figure 64: Power Wiring
Conduit.
Figure 63: Single Zone Outdoor Unit Power Wiring Diagram.
7/16
" ± 1/8
"
13/16
"
GN/YL
Power Wiring, Ground
to Outdoor Unit
Communication / Connection
(Power), Ground Cable
From Outdoor Unit
To Indoor Unit
13/16
"
GN/YL
GN/YL = (Ground, Yellow)
7/16
" ± 1/8
"
Power Supply / Power Wiring Specifications
• All power wiring installation must be performed by authorized 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. It may generate heat and / or
cause a fire, resulting in physical injury or death.
• Use heat-proof electrical wire capable of withstanding temperatures up to 167°F to avoid wiring malfunction and electrical shock, which may
cause physical injury or death.
• Install appropriately sized breakers / fuses / overcurrent protection switches and wiring in accordance with local, state, and NEC regulation
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.
• Per code, install a main indoor breaker and an outdoor service disconnect that interrupts all power sources simultaneously. There is risk of
fire, electric shock, explosion, physical injury or death.
• If there is a possibility of momentary blackout, or the power goes on and off while the system is operating, install a field-supplied phase loss
protection circuit. If not, the compressor and other components may be damaged.
• Use heat-proof electrical wire capable of withstanding temperatures up to 167°F to avoid damage to unit.
• 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.
Refer to Electrical Data table for ampere ratings. Properly size all circuit breakers / fuses, wiring and field provided components per local codes.
There is risk of fire, electric shock, explosion, physical injury or death.
Summary of Contents for LV420HV
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