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.
Power Supply / Power Wiring
Specifications
Outdoor unit(s) and Compact DOAS units must be
provided power from separate breakers. For detailed
information, see the Multi V Outdoor Unit Engineering
and Installation Manuals on www.lghvac.com.
Compact DOAS units
WARNING
•
All power wiring installation must be performed by trained
service providers working in accordance with local, state,
and NEC regulations related to electrical equipment and
wiring, and following the instructions in this manual. Failure
to do so will lead to electric shock and bodily injury or
death.
•
Use specified wiring for connections, and ensure that
external force is not imparted to terminal connections. If
connections are too firmly attached, it will generate heat
and / or cause a fire, resulting in physical injury or death.
•
Install appropriately sized breakers / fuses / overcurrent
protection switches and wiring in accordance with local,
state, and NEC regulations related to electrical equipment
and wiring, and following the instructions in this manual.
Generated overcurrent will include some amount of direct
current. Using an oversized breaker or fuse will result in
electric shock, physical injury or death.
•
Use the appropriate type of overcurrent protection.
Generated overcurrent will include some amount of direct
current, and if the appropriate type of overcurrent protection
is not installed, there is a risk of fire, electric shock, and
physical injury or death.
•
Ground wiring is required to prevent accidental electrical
shock during current leakage, communication problems
from electrical noise, and motor current leakage.
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.
Note:
•
Install appropriately sized breakers / fuses / overcurrent
protection switches and wiring in accordance with local,
state, and NEC regulations related to electrical equipment
and wiring, and following the instructions in this manual.
Generated overcurrent could include some amount of direct
current. Using an oversized breaker or fuse will result in
equipment malfunction and property damage.
•
Do not connect ground wire to refrigerant, gas, or water
piping to lightning rods; to telephone ground wiring; or to
the building plumbing system. Failure to properly provide a
National Electrical Code-approved earth ground can result
in property damage and equipment malfunction
Communication Cable Specifications
From Outdoor Unit to DOAS Units
•
Communication cable from Main Outdoor Unit to
DOAS Units is to be LG supplied or field supplied 18
AWG, 4-conductor, twisted, stranded, shielded.
Never splice communications cable. Ensure the
communication cable shield is properly grounded to
the Main Outdoor Unit chassis only. Do not ground
the Outdoor Unit to DOAS 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 main
outdoor unit to the last component connected and
insulated to prevent grounding against the DOAS Unit
electrical enclosures.
•
Start the communication cable at the main outdoor
unit and route to the DOAS units in a daisy chain
configuration.
configuration.
•
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
WARNING
•
Ground wiring is required to prevent accidental electrical
shock during current leakage, communication problems
from electrical noise, and motor current leakage.
connect the ground line to the pipes. There is risk of fire,
electric shock, explosion, physical injury or death.
•
Never ground the shield of the communications cable to
the indoor unit frame or other grounded entities of the
building. In adequate connections will generate heat, cause
a fire, and physic al injury or death
Note:
•
Always verify the communication cable is connected to a
communications terminal on the outdoor unit(s). Never
apply line 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 shall be provided a
separate cable (i.e., between outdoor unit(s) and DOAS
unit(s), 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
•
Compact DOAS units require 1Ø, 208/230V, 60Hz
power, but each unit draws minimal power.
•
Where permitted by NEC and local codes, multiple
DOAS units can be powered from a single breaker.
•
Service switches typically must be installed for each
DOAS unit
•
Ground each DOAS unit separately to a solid earth
ground source per NEC and local code requirements.
Do not
Do not
Do not install in a starburst
30
