Electrical Connections - LG LC248HV Engineering Manual

ELECTRICAL CONNECTIONS

General Power Wiring / Communications Cable Guidelines
• Follow manufacturer's circuit diagrams displayed on the inside of the control box cover.
• Confirm power source specifications.
• Properly ground the ODU and the IDU per National Electrical Code (NEC) and local codes.
• Connect the wiring firmly so that the wires cannot be easily pulled out.
• Confirm that the electrical capacity is sufficient.
• Power supply to the outdoor unit must be selected based on NEC and local codes. Maximum
allowable voltage fluctuation ±10% or nameplate rated value.
• It is recommended that a circuit breaker is installed, especially if conditions could become
wet or moist.
• Include a disconnect in the power wiring system. Add an air gap contact separation of at least
1/8 inch in each active (phase) conductor.
• Any openings where the field wiring enters the cabinet must be completely sealed.
Power Supply / Power Wiring
• LG Single Zone Four-Way Cassette 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. See below and the next page for communication / connection (power) cable specifications
from the outdoor unit to the indoor unit.
• Ground wire must be longer than the common power / communication wires.
• Connect the wiring firmly so the wires cannot be easily pulled out.
• 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.
WARNING
• Terminal screws will become loose during transport. Properly tighten the terminal connections during installation or risk electric shock, phys-
ical injury, or death.
• Loose wiring will cause unit to malfunction, overheat, and catch fire, resulting in severe injury or death.
• Terminal screws will loosen during transport. Properly tighten the terminal connections during installation or risk equipment malfunction or
property damage.
• Loose wiring will cause unit malfunction, the wires to burnout or the terminal to overheat and catch fire. There is a risk of equipment malfunc-
tion or property damage.
A voltage drop will cause the following problems:
• Magnetic switch vibration, fuse breaks, or disturbance to the normal function of an overload protection device.
• Compressor will not receive the proper starting current.
Communication / Connection (Power) Cable Specifications from Outdoor
Unit to Indoor Unit
• For communication / connection (power) wires between the Single Zone outdoor unit and the indoor unit for lengths up to 130 feet, use a
minimum 14 gauge, four (4) conductor, stranded, shielded or unshielded wire. If shielded, the wire must be grounded to the chassis at the
outdoor unit only.
• When the communication / connection (power) wires between the indoor unit and outdoor unit is GREATER THAN 130 feet, use:
• A two (2) conductor wire for power.
• A two (2) conductor wire for communication / ground.
• Separate the power AT LEAST two (2) inches away from the communication / ground wire.
• All wiring is still minimum 14 gauge, stranded, shielded, or unshielded as cited above.
• Insulation material as required by local code.
• Firmly attach the cable; provide slack but secure in a way to prevent external forces from being imparted on the terminal block.
• Wiring must be completed without splices.
WARNING
All power wiring and communication cable installation must be performed by trained service providers working in accordance with local, state, and Na-
tional 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.
36 | PRODUCT DATA ©
Figure 29: General Four-Way Ceiling Cassette
System Power / Communications System Sche-
matic (Appearances May Vary).
L N
Outdoor Unit
Power Supply
Main Switch
G
L N
Circuit Breaker
Terminal Block Outdoor
1(L1) 2(L2)
Fuse
Power Wiring
(Including Ground)
Power
Wiring
Terminal Block Outdoor
1(L1) 2(L2) 3
Communication
Cable
1(L1) 2(L2) 3
Terminal Block Indoor
Indoor Unit