LMN158HVT Installation Guide
40
Multi F Standard Wall-Mounted Indoor Unit
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.
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ELECTRICAL WIRING
• If power wires are not properly terminated and firmly attached, there is risk of fire, electric shock, and physical injury or death.
Power Wiring Specications and Best Practices/Controller Options
Power Supply/Power Wiring Specifications, continued
Communication Cables Between the Wall Indoor Unit and the Controller
• Simple Controllers: eld-provided, 18 gauge, stranded and shielded, four-conductor communication cable.
• All other Central Controllers: eld-provided, 18 gauge, stranded and shielded, two-conductor communication cable.
• Insulation material as recommended by local code.
• Connect all central control devices such as ACP, BACnet
®
and LonWorks
®
gateways, and energy recovery ventilators all on the same cable.
Order does not matter. Polarity does. Keep “A” terminals with “A” terminals, and “B” terminals with “B” terminals.
• Starting at the outdoor unit, terminate the cable on terminals Internet A and Internet B. Route the cable as needed between each device.
• Use a four (4) conductor, shielded, stranded cable between the
Multi Zone outdoor unit and the indoor units.
• Minimum 18 gauge shielded CVVS or CPEVS cable.
• Insulation material as required by local code.
• Rated for continuous exposure of temperatures up to 140°F.
• Maximum allowable cable length: 984 feet.
• Firmly attach the cable; provide slack but secure in a way to pre-
vent external forces from being imparted on the terminal block.
• Wiring should be completed without splices.
• Terminate the cable shield to a grounded surface at the outdoor
unit only.
Note:
• Always verify the communication cable is connected to a communications terminal on the Multi Zone unit. Never apply line voltage
power to the communication cable connection. If contact is made, the circuit boards may be damaged.
• The shield of the communications cable connecting the outdoor unit to the indoor unit should be grounded only to the outdoor unit frame.
• Tie the shield of each cable segment together using a wire nut at each indoor unit. Maintain polarity throughout the communication network.
• Position the 4-conductor ODU/IDU communications and power cable away from the input line voltage wiring.
General Power/Communication Cable Specifications
Note:
• Never apply line voltage power to the communications cable terminal block. If contact is made, the PCBs may be damaged.
• Always include some allowance in the wiring length when terminating. Provide some slack to facilitate removing the electrical
panels while servicing.
• Never ground the shield of the communications cable to the indoor unit frame or other grounded entities of the building. Ground
the communications cable shield only at the outdoor unit. Improperly grounding this cable can cause communications errors.
Controller Options
Refer to Table 19 as to which remote controller model is used for each IDU. Once all wiring is connected to the indoor and outdoor units be
sure to test the accompanying remote controllers for performance. As always, follow all safety warnings and notes when operating the units
using the remote controller. Additionally, all of the Multi F/Multi F Max outdoor models can use the following controllers when accompanied
with the PI 485 VNet Accessory:
Multi Zone IDU Model Wireless Controller Model
LSNXXXHSV4 AKB73835312
LMNXX8HVT AKB73635606
Table 27: IDU Models and Associated Wireless Controller Model
• AC Smart
• ACP
• BACnet®
• LonWorks®
• LGMV
BACnet® is a registered trademark of ASHRAE. LonWorks® is a registered trademark of Echelon Corporation.