Wiring Connections; General Information - LG MULTI F Engineering Manual

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 units, indoor units, and branch distribution units.
• Install a main shutoff switch or circuit breaker that interrupts all power sources simultaneously (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.
Power Wiring and Communications Cable Installation
For both Multi F and Multi F MAX systems, power is wired to the outdoor unit only. The outdoor unit will supply power to the branch distribu-
tion units (Multi F MAX systems only) and the indoor units through the power wiring / communications cable.
Electrical Specifications
1. Multi F and Multi F MAX Outdoor Units: 1Ø, 208-230V, 60Hz
2. Indoor units / Branch Distribution Units (Multi F MAX systems only): 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 Multi F Outdoor Units to Indoor Units = 4 x 18AWG
• From Multi F MAX Outdoor Units to Branch Distribution Units = 4 x 16AWG
• From Multi F MAX Branch Distribution Units to Indoor Units = 4 x 18AWG
• Maximum Allowable Temperature for Wiring: 194°F
• Multi F System Maximum Cable Length: 82 ft.
• Multi F MAX System Maximum Cable Length:
- Outdoor Unit to Branch Distribution Unit(s): 180.4 ft.
- Branch Distribution Unit(s) to Indoor Unit(s): 49.2 ft.
• Indoor Unit(s) to Wired Controller: Three-core cable
214 | WIRING CONNECTIONS
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.
F
MULTI
F
MULTI
Figure 300:Power Wiring to Multi F and
Multi F MAX ODU.
Figure 301:Power Wiring and Communi-
cations Cable from the Multi F ODU to the
IDUs, or from the Multi F MAX ODU to the
BDUs and from the BD Unit to the IDUs.
MAX