LG PAHCMR000 Installation Manual page 34

EXTERNAL CONNECTION DIAGRAM
34
Example 2) Single Split + LG Control/DDC (Modbus RTU)
Air Handling Unit
(Field supply)
DX
Coil
Modbus
Local AHU Communication
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.
Liquid pipe
Gas pipe
Pipe out (Gas) Thermistor
Pipe in (Liquid) Thermistor
Discharge Thermistor
Central Controller
ACP : CH5
AC SMART : CH1
A+ B-
Main
module
A+ B-
CH3
A+ CH4
B- CH4
Adap ter
L
N
PI 485
PMNFP14A1
BUS -A
BUS -B
CN_PWR
CN_OUT
Comm.
module
A+ B- RI2 G RI3 G RI4 G
CH2
SINGLE N
SINGLE S
12V
EEV
SIG
GND
Wired Remote
Controller
SINGLE SPLIT
Outdoor unit
CN_CP(N)
CN_CP(L)
CN_CENTRAL
L N
Power Supply