LG MULTI V ARUN072BTE4 Service Manual page 20

OTHER CONTROLS
Emergency Operation
Emergency Operation
If an inverter compressor is not operating, the system can still run 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.
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.
If Slave 1 Outdoor Unit Inverter Compressor Fails
MASTER SLAVE1
INV1 INV2 INV1
1. Ensure Slave 1 Outdoor Unit PCB No. 5 DIP Switch is Set to
ON.
2. Select the "SVC" Mode By Using the ►and◄ Buttons, then
Push the ● Button.
3. Select the "Se4" Function By Using the ►and◄ Buttons, then
Push the ● Button.
4. Select the "inv1" Option By Using the ►and◄ Buttons, then
Push the ● Button.
5. Select "Action" By Using the ►and◄ Buttons, then Push the ●
Button.
Backup Mode Cancellation
Select the "off" Action By Using the ►and◄ Buttons, then Push the ● Button.
• Do not run the system under emergency operation with an inverter compressor failure for more than 48 hours. It may cause
compressor failure within the other outdoor units.
• During the emergency operation, cooling / heating capacity may be reduced.
20
SLAVE2
INV2 INV1 INV2
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.
If Slave 2 Outdoor Unit Fails
MASTER SLAVE1
INV1 INV2 INV1
1. Ensure Slave 2 Outdoor Unit PCB No. 5 DIP Switch is Set to
ON.
2. Select the "SVC" Mode By Using the ►and◄ Buttons, then
Push the ● Button.
3. Select the "Se4" Function By Using the ►and◄ Buttons, then
Push the ● Button.
4. Select the "inv1" Option By Using the ►and◄ Buttons, then
Push the ● Button.
5. Select "Action" By Using the ►and◄ Buttons, then Push the ●
Button.
SLAVE2
INV2 INV1 INV2