Wiring Connections; Electrical Connections; General Information - LG LH247HV Engineering Manual

eleCtriCal ConneCtionS

Wiring connections

general information

• Only qualified technicians—in accordance with federal, state, and local codes, and manufacturer product diagrams and requirements—
should install the power wiring and communication cables.
• Use only copper wiring that is stranded, shielded with the wires separately insulated.
• Do not use a multi-conductor cable with more than five (5) wires in one (1) core.
• Power wiring and communications cable sizes must comply with applicable federal UL / ETL, state, and local codes.
• Verify that the branch switch and circuit breaker are set to OFF before installing the wiring system.
• 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.
• Install a ground wire for the outdoor unit and indoor unit.
• Install a main shutoff switch or circuit breaker that interrupts the power source (circuit breaker should be resistant to electromagnetic
currents).
• To avoid the possibility of explosion, fire, etc., do not connect the ground wiring to gas or sewage pipes, lightening rods, and telephone
wires. Use clamps to prevent the wires from touching the piping.
• 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.
• Do not install a phase-advancing capacitor; the outdoor unit may overheat.
• Verify all wiring / cable connections are appropriately tightened.
Power Wiring and Communication Cable installation
For Duct-Free Split systems, power is wired to the outdoor unit only. The outdoor unit will supply power to the indoor units through the power
wiring / communications cable.
electrical Specifications
1. Ceiling-Concealed Duct (High Static) Outdoor Unit: 1Ø, 208-230V, 60Hz.
2. Ceiling-Concealed Duct (High Static) Indoor Unit: 1Ø, 208-230V, 60Hz from the outdoor unit
(Indoor units draw minimal power.)
3. Power supply wire type and size should be selected based on NEC and local codes. Maximum
allowable voltage fluctuation ±10% of the nameplate rated value.
4. Properly ground the outdoor unit per NEC and / or local code.
5. Use only copper wiring that is stranded and shielded with the wires separately insulated.
Power Wiring / Communications Cable Specifications
• From Ceiling-Concealed Duct (High Static) Outdoor Unit to Indoor Unit = 4C x 18 AWG
• Maximum Allowable Temperature: 194°F
• Indoor Unit(s) to Wired Controller: Three-core cable
62 | duct (HIgH StatIc)
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.
Figure 57: Power Wiring and Communica-
tions Cable from the Outdoor Unit to the
Indoor Unit.