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Read and understand all power-related DANGER and WARNING statements in this manual before working with power cables.
Ensure the power source is disconnected from the indoor unit's power input cable before connecting the cable.
Improper connections and inadequate grounding can cause accidental injury or death.
Note:
Keep line voltage power away from the communications terminals. Line voltage power applied to the communications terminals will damage the
indoor unit control board and it will have to be replaced. Maintain a minimum of two (2) inches between line voltage wires and communications or
zone controller cables.
Size all field provided electrical components per NEC and local code. Always use copper wire.
Power Wiring Instructions
1. If not already done so, read Connecting Power and Control Wiring on page 50.
2. Provide clean 208/60/1 power to the unit. Maximum acceptable power fluctuation range is 188 volts to
253 volts.
3. To access the power and communications terminal block on high-static ducted units (BH/BG/BR/B8)
and low-static built-in units (B3/B4), remove the control box cover.
4. To access the power and communications terminal block on low-static ducted units (L1/L2/L3), the
terminal block is behind the end panel of the case. Refer to Figure 19.
5. Remove a knock-out plug from the control box. Do not use the same knock-out as the communica-
tions and zone controller cables.
6. To prevent wire chafing, install a field-supplied plastic or rubber grommet in the hole just created by
removing the knock-out plug.
7. If using conduit, follow industry best practice procedures to connect the conduit to the control box
using field-provided fittings.
8. Provide enough slack wire at each indoor unit to connect to the terminal block without tension on the
wire. Route the wire through the conduit (if used) and into the control box. Be sure to keep a minimum
of two (2) inches of spacing between the power wiring and the communications wiring.
9. Secure power wiring to the inside surface of the control box using a field-provided nylon wire clamp.
10. If needed, secure the power wiring in appropriate locations outside the indoor unit to prevent damage
to the wire or injury to maintenance personnel.
11. Strip approximately half (1/2) of an inch of insulation from each of the power wire conductors. Tightly
crimp a spade connector to the Hot, Neutral and Ground Wires. Insert the spade connector under the
appropriate terminal block screw and tighten. Refer to Figure 34 through Figure 40 for details of the
terminal block wiring of the unit being installed.
12. Securely tighten the terminal screws to prevent the conductors from coming loose.
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.
Indoor Unit Power Cable Connections
WIRING
51
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