Auto Addressing The Indoor Units - LG Multi V ARUN053GF2 Installation Manual

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Auto Addressing the Indoor Units

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 Space II unit and the indoor
units. Verify the indoor unit to Space II 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 Space II 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 Space II unit terminal tagged IDU(B).
3. Verify the shield of the communications cable is grounded at the Space II unit only. All segment shields should be spliced together at each
indoor unit and NOT grounded.
4. After repairing the communications cable, repeat the auto addressing process until successful: Press and hold red Auto Address Button
for about five (5) seconds. Release when "88" appears on the LED. After three (3) to seven (7) minutes, the display will flash a number for
about ten (10) 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 Space II unit assigned to each indoor unit by the auto address procedure in the column provided on the
Pre-commissioning Device Configuration Worksheet.
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