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ELECTRICAL CONNECTIONS
Power Wiring and Communication Cable
Power Wiring and Communications Cable System
Figure 11: Example of a Typical Heat Pump Operation Power Wiring and Communications Cable Schematic.
Fused Disconnect
Single-phase,
Switch or Breaker
two-wire,
60Hz 208/230V
Power Supply
(Main Switch)
Fused Disconnect
Switch or Breaker
Power supply
1 Phase
60Hz 208/230V
• 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).
• 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.
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.
38 | ELECTRICAL CONNECTIONS
Do not ground the ODU to IDUs communication cable at any other point. Wiring must
Do not ground the ODU to IDUs communication cable at any other point. Wiring must
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.
Single-phase, two-wire (L, N) Water Mini Unit
Communication line (three line): Wired remote control
Single Phase of power supply line (L, N)
Communication line (two shielded line): Between Indoor Unit and Water Mini Unit
Pull Box(Installer Option)
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