LG ACHH017VBAB Installation And Owner's Manual page 98

ELECTRICAL
Unit Combination Setup
Figure 44: Unit Combination Setup.
Main Unit
A B
A B
CH3
Main Controller
1. Communication cable is daisy chained from the Main Chiller Main Controller on CH3 to the Sub Chiller(s) Main Controller(s) on CH3
Always Match A to A, and B to B.
2. Communication cable is connected from the HMI Controller to the Main Controller. Always Match A to A, and B to B.
3. Communication cable from chiller to HMI is to be 18 AWG, 2-conductor, twisted, stranded, shielded. Ensure the communication cable
shield is properly grounded to the chiller chassis only.
with all applicable local and national codes.
4. Install the communication cable and power wiring separately so that communication cable is not impacted by any electric noise generated
from power wiring. Do not install the power wiring and the communication cables in the same conduit.
5. Up to five (5) chillers can be combined using the A-B CH3 bus.
• If the interlocked chiller number and address are not set from the HMI, a communication error will occur. (Refer to the Control > Freezer
Interlock Control about HMI Address Settings in the Chiller Installation and Operation Manual.)
• If Main Controller address does not match the HMI address, a communication error will occur. (Refer to the Control > Freezer Address
Setting about the Controller Address Settings in the Chiller Installation and Operation Manual.)
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Sub A Unit
A B
C H 3
Main Controller
Do not ground the communication cable at any other point. Wiring must comply
Due to our policy of continuous product innovation, some specifications may change without notification.
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Sub B Unit
A B
C H 3
Main Controller
: Field wiring