Troubleshooting A Failed Indoor Unit Auto Addressing Procedure - LG MULTI V S ARUN038GSS4 Installation Manual

WIRING
Indoor Unit Auto Addressing

Troubleshooting a Failed Indoor Unit Auto Addressing Procedure

If the quantity of indoor units the auto addressing procedure found is incorrect, or the "88" never disappears from the display for the seven (7)
minutes, the auto address routine has failed and a communications problem exists. If the Auto Address Procedure failed:
1. Verify ALL indoor unit ON / OFF buttons are in the OFF position (i.e., ON / OFF button NOT illuminated).
2. Check the terminations, polarity, and continuity of each conductor on the communications cable between the outdoor unit and the indoor
units. Verify the indoor unit to outdoor unit communications cable is wired correctly.
3. Verify the shield of the communications cable is grounded at the outdoor unit only. All segment shields should be spliced together at each
indoor unit and NOT grounded.
4. After repairing the communications cable, go to Step 9 of the Initiate the Auto Addressing Procedure and repeat the process until
successful: Press and hold the red SW01C button for about five (5) seconds. Release when "88" appears on the LED. After two (2) to sev-
en (7) minutes, the display will flash a number for ten (10) to thirty (30) seconds indicating how many indoor units the system successfully
communicated with.
5. This number should match the known installed number of indoor units if the auto addressing procedure was successful.
6. Upon completion of the auto addressing routine, the display will be blank and the system will be in standby waiting for another command.
7. Record the system address the outdoor unit assigned to each indoor unit by the auto address procedure in the column provided on the
Pre-commissioning Device Configuration Worksheet.
8. After recording the system addresses assigned to each device, open the outdoor unit disconnect. Remove the outdoor unit to indoor unit
communications cable from terminals IDU(A) and IDU(B). Protect conductors by placing electrical tape over the bare ends to prevent an
accidental compressor start from occurring before the Commissioning Agent arrives.
9. Close the disconnect to reapply power to the outdoor unit and energize the compressor crankcase heater. Once again, verify the outdoor
unit to indoor unit(s) communications cable is not connected to terminals IDU(A) and IDU(B) of the outdoor unit.
10. Replace the control panel cover.
56
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.