LG MULTI V WATER MINI Engineering Manual page 39

Communication Cable
Connect communications cable between indoor units using a daisy chain configuration only. STAR or HOME RUN communications cable
configurations are not permitted.
Figure 12: Multi V Water Mini System—Daisy-Chain Communications Cable Configuration.
• Ground wiring is required to prevent accidental electrical shock during current leakage, communication problems from electrical noise, and
motor current leakage. Do not connect the ground line to the pipes. There is risk of fire, electric shock, explosion, physical injury or death.
• Install a main shutoff switch that interrupts all power sources simultaneously. There is risk of fire, electric shock, explosion, physical injury or
death.
• Communication cable between ODU to IDUs to be 18 AWG, 2-conductor, twisted, stranded, shielded. Ensure the communication cable shield
is properly grounded to the ODU chassis only.
comply with all applicable local and national codes. Inadequate connections may generate heat, cause a fire, and physical injury or death.
• Ground wiring is required to prevent communication problems from
electrical noise and motor current leakage.
• Make sure that the terminal numbers match (A to A, B to B, etc.).
• Communication cable between ODU to IDUs must be 18 AWG,
2-conductor, twisted, stranded, shielded. Ensure the communication
cable shield is properly grounded to the ODU chassis only.
not ground the ODU to IDUs communication cable at any other point.
Wiring must comply with all applicable local and national codes.
• Maintain polarity throughout the communication network.
• Do not route communications cable and power wiring in the
same conduit.
• Power wiring and communication cables must be routed in a manner
that keeps them a minimum of two (2) inches apart.
ELECTRICAL CONNECTIONS
Do not ground the ODU to IDUs communication cable at any other point. Wiring must
Do
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Power Wiring and Communication Cable
Figure 13: Water Source Unit and Indoor Unit Communication Terminals.
SODU B SODU A IDU B IDU A INT B INT A DRY 1 DRY 2 GND
1(L1) 2(L2)
Example: TT / TU
Cassette Frames
See wiring diagrams for the
other indoor unit styles.
Between Water Mini Unit and Indoor Units
3 4 L(L1) N(L2) A
Example: TR / TQ / TM /
TN Cassette Frames
ELECTRICAL CONNECTIONS | 39
B