Quick Control Setting; Troubleshooting A Failed Indoor Unit Auto Addressing Procedure; Other Controls - LG Multi V5 Service Manual

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 procedure 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.
• Verify the conductor connected to the "3" (or "5" in the case of cassette frame codes TP, TN, TM) terminals on all indoor units and is
terminated on the outdoor unit terminal tagged IDU(A).
• In a similar fashion, verify the conductor connected to all indoor units on the "4" (or "6" in the case of cassette chassis codes TP, TN, TM)
terminals and is terminated on the outdoor unit terminal tagged IDU(B).
3. Verify the shield of the communications cable is grounded at the outdoor unit only. All segment shields must be spliced together at each
indoor unit and NOT grounded.
4. After repairing the communications cable, go to Step 9 of 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 SSD. After three (3) to seven (7) minutes,
the display will flash a number for about thirty (30) seconds indicating how many total indoor units the system successfully communicated
with.
5. This number must 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 com-
mand.
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 LG trained commissioner 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.

Quick Control Setting

Main PCB DIP switches are factory set to all OFF.
• Verify all indoor units are Generation 4 models.
• Change No. 3 on the Main PCB Dip switch bank DIP-SW01 from OFF to On.
• Push the SW01D reset button.
Figure 5: Quick Control Setting.
DIP Switch
DIP-SW01 SSD
OFF
Due to our policy of continuous product innovation, some specifications may change without notification.
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OTHER CONTROLS

Initial Setup / Quick Control
OFF
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