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Due to our policy of continuous product innovation, some specifications may change without notification.
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LG
Air-Cooled Cooling Only Inverter Scroll Chiller Installation and Owners Manual
Index
Signal Type
Location
Remarks
Power
DC Power
12 V DC
Required
Central Control Communication
Communication
CH2 A, B
Required
HMI Communication
Communication
CH3 A, B
Required
Modbus
Communication
CH4 A, B
Optional (Field Installed)
Ambient Thermistor
DI
UI1, G
Required
Flow Switch
DI
UI5, G
Factory Installed
Pump Interlock
DI
UI6, G
Required Closed Contact from Pump During
Flow
Remote On / Off
DI
DI1, GND
Optional (Field Installed)
Remote CO / HP
DI
DI2, GND
Optional (Field Installed)
Remote Alarm
DI
DI3, GND
Optional (Field Installed)
Alarm Status
DO
DO1, COM
Optional (Field Installed)
On / Off Status
DO
DO2
Optional (Field Installed)
Pump Output
DO
DO3
Optional (Field Installed)
Heater Output
DO
DO5
Optional (Field Installed)
Table 29: Field-Installed Wiring / Cable Connections.
Table 28: Power Wiring System to Multiple, Grouped Chillers.
Circuit Breaker
Circuit Breaker
Circuit Breaker
Main Power Supply
Circuit Breaker
Main Power Supply
Cir
Main
y
Refer to the wiring diagram for field-installed wiring. Only the main panel (HMI installed panel) requires wiring at the site. The control box is
shipped fully wired from the factory.
5. Circuit Breaker and Power Wiring Connections.
• Each chiller must have its own circuit breaker and direct power
wiring.
•
Do not install one circuit breaker for multiple chillers.
Do
not daisy chain the power wiring from the main power supply to
multiple chillers.
• Always label each circuit breaker and its connected chiller.
• Refer to the specification and electrical data when selecting circuit
breaker capacities. Follow all state, local, and NEC guidelines
when choosing and installing circuit breakers and power wiring.
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