LG ACHH Series Manual page 16

Wiring Diagrams
• Chiller Main PCB
UI1_G
(Ambient Temp.)
CH4 A+ B-
(Modbus Communication Connector)
CH3 A+ B-
(HMI Communication Connector)
CH2 A+ B-
(Communication Connector)
12VDC+-
(DC POWER 12 V)
Do1(C)_COM
(Alarm Status Output Contact)
Do2
(Running Status Output Contact)
Do3
(Load Pump Output Contact)
Do5
(Heater Output Contact )
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UI15_G
(Load Flow Switch Input)
UI16_G
(Load Pump Interlock Contact Input)
GRD_DI1
(Remote On/OFF)
GRD_DI2
(Remote CO/Hp)
GRD_DI3
(Remote Alarm)