LG MULTI V IV ARNU07GTU 2 Series - Page 133

Troubleshooting Guide
- 133 -
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Only for training and service purposes
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Location of 4way valve connector on
Main PCB(marked as 4way,CN09)
** Confirm the 4way valve coil is inserted to the end
* Measure the resistance of 4way valve
**** Check the output voltage of terminal socket
during heating operation
*** When power is supplied in order as follow
(Slave2 ’ Slave1 ’ Mater)
ODU information is displayed one after the other at main PCB 7-segment
1. Model ID
’ 8HP : 8, 10HP : 10, 12HP : 12, 14HP : 14, 16HP : 16, 18HP : 18, 20HP : 20
2. Total Capacity
’ Displayed with HP
3. ODU Type
’ HEAT PUMP : 2
4. Power type
’ 380V : 38
5. Model type
’ Full Function : 1
***** Checking method for outdoor unit of 3unit system
(Master + Slave1 + Slave2)
¿ Close all the SVC valves of high / low pressure
¡ Operate system
¬ Check the difference of high and low pressure with LGMV for each unit (Master, Slave1, Slave2)
√ If there is a unit in which the difference is not increased then the 4way valve of that unit is defective