16
PRDCAM
AHU Communication Kit Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
AHU COMMUNICATIONS KIT INSTALLATION
Wiring Diagram
*DI is available when Dip SW1-1 is Off
Name Port
Value
Electrical Spec Function
Short Open
On/Off DI1 On Off Non voltage Operation On/Off
Cool/Heat DI2 Heating Cooling Non voltage Operation Mode
Emer. Stop DI3 Emergency Stop Normal Non voltage Emergency Stop Input (Priority operation)
n
o
it
c
n
u
F
.
c
e
p
S
l
a
c
ir
t
c
e
l
E
e
u
l
a
V
tr
o
P
e
m
a
N
Alarm DO1
30 VDC / 5 A
250 VAC / 5 A
Output normal or error status (Relay C Contact)
- A Contact
Normal status : open
Error status : short
- B Contact
Normal status : short
Error status : open
-Normal Status
A B COM
-Error Status
A B COM
n
o
it
c
n
u
F
.
c
e
p
S
l
a
ci
rt
c
e
l
E
m
e
tI
tr
o
P
e
m
a
N
ODU Comm. RS485 CH2
ODU Comm.
(CEN A/B or
INT A/B)
Max 3280 ft,
2C x 18~16 AWG
(shield wire)
Communication with MULTI V/Single
split ODU for ODU Capacity control
LG
Central Comm.
RS485 CH3 LG Central Comm.
Max 1640 ft,
2C x 18~16 AWG
(shield wire)
Communication with LG centralized
controller through LGAP Protocol
DDC Central
Comm.
RS485 CH4
DDC(Modbus)
Central Comm.
Max 1640 ft,
2C x 18~16 AWG
(shield wire)
Communication with DDC central-
ized controller through Modbus pro-
tocol
Table 8: RS485 Communication Port
Table 9: Digital Input
Table 10: Digital Output – Relay C Contact
