Electrical Wiring - LG LMNH122LRA0 Service Manual

Control Devices and Function

Electrical wiring

Pictorial view of the connection
L
MAIN PCB
CN_CENTRAL
• Special purchase: Central control, PI485(PNF-P14A0M)
ONE SIMPLE CENTRAL CONTROL CONNECTION
OUTDOOR
MAIN PCB
Outdoor unit
Outdoor unit
All the connections are to be done as shown above.
A and B are the communication lines for the indoor and
C and D are the communication lines for the Central Control.
Use two shield lines for C/D connecting line.(Earth the shield line)
74 Multi type Air Conditioner
INDOOR UNIT 1
INDOOR UNIT 2
INDOOR UNIT 3
INDOOR UNIT 4
INDOOR UNIT 5
INDOOR UNIT 6
BUS
B
BUS
A
GND
+10V
D C GND VCC
Outdoor unit
Outdoor unit
MAIN PCB
PI485
Control Box
MAIN PCB
CN_CENTRAL
PI485
CN OUT
INDOOR UNIT
• SET The Address(Group No. & Indoor No.)
* Refer to The Following sheet
(1.3.5 Indoor unit Address setting method)
Vcc
CN-POWER
S1
LED2
IC1P
S5
+
+
LED5
S9
+
LED9
+
LED13
Group Number 0
+
Master Mode LED17 ON KSDO4H
L1 2 3 4
S19
PI485
: PNF-P14A0M
N
L
10
G
A
B
CENTRAL
VCC
GND
CONTROL
C
UNIT
D
C D
GND
CN-POWER
GND
CN-COM B
CN-COM A
S2 S4
L
LED3 LED4
S3
S6
+ +
+
LED7 LED8
TX1
S10 S11 S12
+ +
LED12
LED10 LED11
S15 S16
S14 + +
+
LED16
LED14 LED15
PWB:6870A10001A
ASM:6711A20005E
S15 S18
VCC
CENTRAL
GND
CONTROL
C
UNIT
D