LG MULTI V ARNU243TTD4 - Page 50

50
MULTI V Ceiling Cassette Indoor Units
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.
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Heat Recovery Units
• Communication cable from Master Outdoor Unit to Indoor Units / Heat Recovery Units is to be 18 AWG, 2-conductor, twisted, stranded,
shielded. Ensure the communication cable shield is properly grounded to the Master Outdoor Unit chassis only.
Do not ground the
Outdoor Unit to Indoor Units / Heat Recovery Units communication cable at any other point. Wiring must comply with all applicable local
and national codes.
• Cable shields between the connected devices must be tied together and continuous from the master outdoor unit to the last component
connected.
• Start the communication cable at the master outdoor unit and route to the indoor units / heat recovery units in a daisy chain configuration.
Do not install in a starburst configuration.
• Indoor Unit / Heat Recovery Unit Communication Bus: The communication terminals are labeled differently among the indoor units, depend-
ing on type (currently for indoor units: A / B, 3[A] / 4[B], or 3 / 4; for heat recovery units: A / B). Refer to the wiring diagram schematic found
in the indoor unit itself, or to the indoor unit wiring diagrams for more information. Match IDU A and B terminals on outdoor unit to A (3) and
B (4) terminals on indoor units / heat recovery units.
• Insulation as required by NEC and local codes.
• Rated for continuous exposure of temperatures up to 140°F.
• Maximum allowable communication cable length is 3,281 feet.
Heat Recovery Unit
(For Heat Recovery
Systems Only)
Master Outdoor Unit
Indoor Unit Indoor Unit Indoor Unit Indoor Unit Indoor Unit Indoor Unit
Wired Controllers Wired Controllers Wired Controllers
Figure 54: Correct Master Outdoor Unit to Indoor Unit / Heat Recovery
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Figure 55: Incorrect Master Outdoor Unit to Indoor Unit / Heat Recovery
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