LG PAHCMR000 Installation Manual page 32

EXTERNAL CONNECTION DIAGRAM
32
Example 2) Single Split + LG Control/DDC (Modbus RTU)
Air Handling Unit
(Field supply)
Local AHU
Controller
(Out of LG scope)
Refrigerant Piping (Field Supply)
Wire & Thermistor (LG Supply)
Wire (Field Supply)
AI/DI/DO Signal(Field Supply)
NOTE
• The type of power supply of outdoor unit can vary depending on the outdoor model.
• Please make wiring between LG controller and outdoor unit with the same polarity.
• LG controller can be optionally applied with DDC.
Central Controller
ACP : CH 1 ~ CH 4
AC SMART : CH 2
Liquid pipe
Gas pipe
Pipe out (Gas) Thermistor
Pipe in (Liquid) Thermistor
Return (Room) Thermistor
DX
Coil
Wired Remote Comm. module
Controller
12V
SIG
GND
Modbus
Communication
A+ CH1
B- CH1
PI 485
PMNFP14A1
BUS -A
BUS -B
CN_PWR
CN_OUT
RI1 G RI3 G RI4 G
SINGLE N
SINGLE SIG
L
EEV Adapter
N
SINGLE SPLIT
Outdoor unit
CN_CP(N)
CN_CP(L)
CN_CENTRAL
L N
Power Supply
L N
Power Supply