LG Multi V Standard Gen 4 Series Installation Manual page 66

WIRING
Connection Procedure
6. Connect the power cable to the terminal block connections. Ensure the screws securely connect the wire to the terminals and are not
loose.
7. Connect the field-provided communications cable to the 3(A) and 4(B) terminal block connections. Polarity matters on the outdoor unit to
indoor unit / heat recovery unit communications bus, and must be maintained throughout the entire system.. Be sure to connect 3(A) termi-
nals to A terminals and 4(B) terminals to B terminals. Refer to the next pages for indoor unit wiring connections, the Outdoor Unit Installation
Manual for information regarding the outdoor unit and heat recovery unit wiring connections, or review the wiring diagrams on the applicable
units.
• Cross connecting the 3(A) and 4(B) terminals will cause communications errors and system malfunction.
• Field-provided communication cable between Master ODU to IDUs / HRUs to be 18 AWG, 2-conductor, twisted, stranded, shielded. Ensure
the communication cable shield is properly grounded to the Master ODU chassis only.
nication cable at any other point. Wiring must comply with all applicable local and national codes.
8. If a remote controller is to be installed, connect the remote controller's cable to the indoor unit's remote controller connection. Controller
connections depend on type of indoor unit being installed. Some indoor units use terminal block connections; other indoor units use Molex
connections. See the wiring diagram for each specific indoor unit.
9. Connect any additional cables required for the installation such as those for the decoration panels.
66
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.
Do not ground the ODU to IDUs / HRUs commu-