LG PAHCMR000 - Page 32

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PAHCMR000 AHU Communication Kit Installation Manual
Due to our policy of continuous product innovation, some specications may change without notication.
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External Connection Diagrams
AHU COMMUNICATIONS KIT INSTALLATION
Return Air Temperature Control
Single Zone and LG Control/DDC (Modbus Signal)
DX
Coil
Liquid pipe
Gas pipe
Fan control
Return (Room) Thermistor
Comm. module
SINGLE ZONE
Outdoor unit
2(N)
1(L)
SINGLE N
SINGLE SIG
GND
12V
SIG
RI1
G
RI3
G
RI4
G
EEV
ACP : CH 1 ~ CH 4
AC SMART : CH 2
Central Controller
Pipe in (Liquid) Thermistor
Pipe out (Gas) Thermistor
PI 485
PMNFP14A1
BUS -A
BUS -B
CN_CENTRAL
CN_PWR
CN_OUT
CN_CP( N)
CN_CP( L)
2(N)
1(L)
3 (CN_COM)
L N
Power Supply
Power Supply
Remote
Controller
L
N
L N
B-CH1
A+ CH1
Modbus
Communication
Adapter
Refrigerant Piping (Field Supply)
Wire & Thermistor (LG Supply)
AI/DI/DO Signal(Field Supply)
Wire (Field Supply)
Air Handling Unit
(field supply)
Local AHU
Controller
(Field Supplied)
Note :
1. The type of power supply of outdoor unit can vary depending on the outdoor model.
2. Please make wiring between LG controller and outdoor unit with the same polarity.
3. LG controller can be optionally applied with DDC.