LG MULTI V HYDRO KIT ARNH963K2A4 Installation Manual page 51

Communications Cable Specifications From Outdoor Unit to Hydro Kits (and
Indoor Units / Heat Recovery Units)
• Communication cable from Master Outdoor Unit to Hydro Kits (and 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.
not ground the Outdoor Unit to Hydro Kits (and 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 hydro kits (and indoor units / heat recovery units) in a daisy chain
configuration. Do not install in a starburst configuration.
• Hydro Kits (and Indoor Unit / Heat Recovery Unit) Communication Bus: The communication terminals are labeled differently among the
components, depending on type (currently for Hydro Kits: 3[A] / 4[B]; 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 Hydro Kit itself, or to the Hydro Kit wiring diagram in the Engineering Manual. Match IDU
A and B terminals on outdoor unit to Hydro Kit 3[A] / 4[B] terminals, and 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 between the
outdoor unit and the Hydro Kit is 3,281 feet (1,000 m).
• Maximum allowable communication cable length between the
Hydro Kit and the LG Hydro Kit Controller (included with the Hydro Kit) or
third-party thermostat (sold separately) is 164 feet (50 m).
• Maximum allowable communication cable length between the
Hydro Kit and the LG manufactured water storage tank sensor is 39 feet
(12 m) (use factory-provided sensor cable).
• Maximum allowable communication cable length between the
Hydro Kit and the LG manufactured dry contact (sold separately) is
164 feet (50 m).
WARNING
• Ground wiring is required to prevent accidental electrical shock dur-
ing current leakage, communication problems from electrical noise,
and motor current leakage.
injury or death.
• Never ground the shield of the communications cable to the
Hydro Kit frame or other grounded entities of the building. Inad-
equate connections will generate heat, cause a fire, and physical
injury or death.
• Always verify the communication cable is connected to a com-
munications terminal on the outdoor unit(s).
voltage power to the communication cable connection. If contact is
made, the PCBs will be damaged.
• Never use a common multiple-core communications cable.
Each communications bus must be provided a separate cable (i.e.,
between outdoor unit(s) and Hydro Kits, outdoor units and central
controller(s). If communications cables of separate systems are
wired using a common multiple-core cable, it will result in a poor
communications signal and unacceptable system operation.
Do not connect the ground line to
Never apply line
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 Life's Good" is a registered trademark of LG Corp.
Communications Cable Speci cations
Figure 33: Correct Master Outdoor Unit to Hydro Kit / Indoor Unit / Heat
Master Outdoor Unit
Hydro Kit
IDU
Heat Recovery Unit
for Heat Recovery
Hydro Kit Unit Controller
Systems Only
Figure 34: Incorrect Master Outdoor Unit to Hydro Kit Indoor Unit / Heat
Master Outdoor Unit
Hydro Kit
IDU
Heat Recovery Unit
for Heat Recovery
Hydro Kit Unit Controller
Systems Only
WIRING
Do
IDU IDU IDU IDU
Indoor Unit Zone Controllers
IDU IDU IDU IDU IDU IDU
Indoor Unit Zone Controllers
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