LG Multi V Series Installation Manual page 23

Installation
3. Group Control 3
Mixture connection with indoor units and Fresh Air Intake Unit
FAU
Master
Master
In case of connecting with standard indoor unit and Fresh Intake Unit, separate Fresh Air Intake
Unit with standard units.
(Because setting temperature are different.)
Other than those, it is same with Group Control 1.
FAU
24 Indoor Unit
FAU
Slave
Display Error Message
FAU Standard Standard
LGAP Network System
Master
Master
FAU FAU
* FAU : Fresh Air Intake Unit
Standard: Standard Indoor Unit
GND
Signal
Slave
12 V
Standard Standard