LG Multi V CRUN Series Service Manual page 188

Control Devices
2 OR MORE SIMPLE CENTRAL CONTROL CONNECTION
001
MAIN PCB
C C
D D
VCC VCC
SUB
GND GND
A A
To Indoor
B
B
Units
Outdoor unit
Outdoor unit
: SUB PCB
SUB
T.B : TERMINAL BLOCK
101
MAIN PCB
C C
D D
VCC
VCC
SUB
GND GND
A A To Indoor
B
B Units
Outdoor unit
Outdoor unit
1. Adhere the 485 SUB PCB(For connecting central control) to the Control Box.
2. Connect the 485 SUB PCB to central control.
3. In the case of connecting two more than central control, set the Master/Slave mode
and then connect each communication lines(C,D) <Refer to above fig>.
*Special purcharse: Central control(P/No.:4995A20105F),
Sub PCB(P/No.:4995A20105G)
* It can be added to 15 Central controls for the slave control.
1.3.4 Indoor unit setting method
The indoor unit PCB has 2 rotary switches. One is for the Group Number setting and another is for Room
Number Setting. The group number on the Central Control rotary switch and on the rotary switch of Indoor
Unit PCB should match exactly.
Like: Group Number 0 on the Central Control = Group Number 0 on all Indoor units to be connected to Group
Number 0.
But the Room Number switch on Central control is one increment of the rotary switch
number on the Indoor PCB.
Like: Rotary switch number 0 on the indoor unit PCB means Room number 1 on the
central control.
188 Outdoor Unit
Indoor unit
Indoor unit
002 003 004 005
Vcc GND C D
Central
control
Unit 1
The connection of Master and Slave
Indoor unit
Indoor unit
102 103 104
Vcc GND C D
Central
control
Unit 1
...
014 015
<Group Number 0>
Master
DIP SWITCH
...
105 115
<Group Number 1>
Slave
DIP SWITCH
Rotary_low
Rotary_low
Indoor unit number 1
On central control
Rotary_high
Rotary_high
Group number 0
On central control
016
116
Note
001
Group No.
Indoor No.
Indoor unit
No. setting
Group unit
No. setting