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MULTI V 5 Outdoor Unit Service Manual
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.
OTHER CONTROLS
Setting Optional Modes
Emergency Operation
If an inverter compressor is not operating, the system can still operate (except the defective compressor) by using one of two methods.
Automatic Emergency Operation (Automatic Backup Function)
If an outdoor unit detects an inverter compressor error during operation, the automatic backup mode is initiated.
1. Inverter 1 compressor automatic emergency operation.
2. Inverter 2 compressor automatic emergency operation.
Backup Mode Cancellation
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If Slave 1 Outdoor Unit Inverter Compressor Fails
1. Ensure Slave 1 Outdoor Unit PCB No. 5 DIP Switch on DIP-
SW01 DIP switch bank is set to ON.
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button.
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button.
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If Slave 2 Outdoor Unit Fails
1. Ensure Slave 2 Outdoor Unit PCB No. 5 DIP Switch on DIP-
SW01 DIP switch bank is set to ON.
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button.
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button.
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button.
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SLAVE1
INV1 INV2 INV1
INV2
INV1 INV2
INV1 INV2 INV1 INV2 INV1 INV2
MASTER SLAVE1 SLAVE2
MASTER SLAVE2
Manual Emergency Operation (Manual Backup Function)
1. Verify which compressor is malfunctioning (refer to the Troubleshooting section in the back of this manual).
2. Turn off the power.
3. Set the DIP switch of the defective outdoor unit following the instructions below.
4. Turn on the power.
•
Do not run the system under emergency operation with an inverter compressor failure for more than 48 hours. It will cause compressor
failure within the other outdoor units.
• During the emergency operation, cooling / heating capacity will be reduced.
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