LG Multi V User manual

Installation Manual
Convertible Surface Mounted and Ceiling Suspended Indoor Units
Ceiling Suspended Indoor Unit
Convertible Surface Mounted Indoor Unit
Ceiling Mounted
Convertible Surface Mounted Indoor Unit
Wall Mounted

The instructions below must be followed to prevent product malfunction, property damage, injury or death to the user or other people.
Incorrect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the symbols
described below.
This symbol indicates that the action or lack thereof could possibly cause death or personal injury.
This symbol indicates that the action or lack thereof could possibly cause property damage.
This symbol indicates that the following action should not be performed.
" "
" "
" "
Note:
This symbol indicates that the action or lack thereof could possibly cause equipment malfunction or failure.
" "
Do not throw away or destroy this manual.
Please read carefully and store in a safe place for future reference.
A list of safety precautions begins on page 4.

Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
33
TABLE OF CONTENTS
Safety Precautions ......................................................................................................................................................................................................... 4
important......................................................................................................................................................................................................................... 4
Rough-In.......................................................................................................................................................................................................................... 4
Introduction..................................................................................................................................................................................................................... 6
Unit Features................................................................................................................................................................................................................... 8
Installation Parts............................................................................................................................................................................................................. 9
Installation Tools .......................................................................................................................................................................................................... 10
Unpack the Indoor Unit/Inspect for Freight Damage .................................................................................................................................................11
Roughing In Overview.................................................................................................................................................................................................. 12
Location Selection ...................................................................................................................................................................................................... 12
Preparing for Installation............................................................................................................................................................................................. 13
Wall Mounting the Convertible Unit ............................................................................................................................................................................ 13
Convertible Indoor Unit................................................................................................................................................................................................ 14
Ceiling Mounting the Convertible Unit ........................................................................................................................................................................ 14
Prepare Refrigerant Pipes for Installation................................................................................................................................................................... 14
Mounting the Ceiling Suspended Unit ........................................................................................................................................................................ 15
Routing the Drain Pipe ............................................................................................................................................................................................... 15
Ceiling Suspended Unit ............................................................................................................................................................................................... 15
Roughing-In Wall-Mounted Zone Controllers ............................................................................................................................................................ 16
Refrigerant Safety......................................................................................................................................................................................................... 17
Refrigerant Pipe Specications .................................................................................................................................................................................. 17
Indoor Unit Piping Connections.................................................................................................................................................................................. 17
Refrigerant Pipe Connections..................................................................................................................................................................................... 18
Flare Connections ...................................................................................................................................................................................................... 18
Brazed Connections ................................................................................................................................................................................................... 18
Condensate Pipe Connection..................................................................................................................................................................................... 19
Connect Drain Pipe ...................................................................................................................................................................................................... 20
Insulate pipes................................................................................................................................................................................................................ 21
Power Wiring ................................................................................................................................................................................................................ 22
Power Wiring Instructions........................................................................................................................................................................................... 22
Outdoor/Indoor Unit Communications Cable Installation Guidelines 23
Low Voltage Communications ................................................................................................................................................................................... 23
Zone Controller Cable Installation .............................................................................................................................................................................. 26
Control PCB DIP Switch Settings............................................................................................................................................................................... 26
Connecting an LG Dry Contact Device....................................................................................................................................................................... 29
Connecting a Smoke Detector.................................................................................................................................................................................... 29
Indoor Unit Control Settings ....................................................................................................................................................................................... 30
Indoor Unit Installation Checklist .............................................................................................................................................................................. 31
Finishing the Installation ............................................................................................................................................................................................. 33
Who to Call for Assistance .......................................................................................................................................................................................... 35

Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
4
MULTI V Convertible and Ceiling Suspended Indoor Units Installation Manual
• Please read this manual completely before installing the product.
• As an installer or service provider, it is your job to install or service the system to operate safetly and efficiently. Improper installation,
adjustment, alteration, service, or maintenance is dangerous to personnel and/or property and can void the warranty.
• Follow the instructions in this manual to prevent product malfunction, property damage, injury or death to the user or other people.
Incorrect operation due to ignoring any instructions will cause harm or damage.
• The level of seriousness is classified by the symbols described below.
This symbol indicates that the action or lack thereof could possibly cause death or personal injury.
This symbol indicates that the action or lack thereof could possibly cause property damage.
This symbol indicates that the following action should not be performed.
" "
" "
" "
Note:
This symbol indicates that the action or lack thereof could possibly cause equipment malfunction or failure.
" "
SAFETY PRECAUTIONS
ROUGH-IN
All electric work must be performed by a licensed electrician
and conform to local building codes or, in the absence of
local codes, with the National Electrical Code (NEC) NFPA 70/
ANSI C1-1993 or current edition, and the instructions given in
this manual.
If the electrical work is not performed properly, it may result in re, electric
shock, physical injury or death.
Do not install, remove, or re-install the unit by yourself
(customer).
There is risk of re, electric shock, physical injury or death.
Ask the dealer or an authorized technician to install the unit.
Improper installation by the user may result in water leaks, re, electric
shock, physical injury or death.
For re-installation of the installed unit, always contact the
dealer or an authorized service provider.
There is risk of re, electric shock, physical injury or death.
Be very careful when transporting the unit.
Indoor unit weight and size preclude one person carrying the unit. Use
two or more people to transport the unit without the assistance of me-
chanical transport equipment. There is a risk of personal injury.
Do not handle indoor units without the use of gloves and
protective clothing. The unit may have sharp edges.
There is a risk of personal injury.
Dispose the packing materials safely.
Destroy the structure of plastic packaging and boxes to prevent children
from playing with them. There is a risk of injury, suffocation and/or death
to humans, animals and wildlife.
Do not install the unit on an unstable structure.
It may result in the failure of the structure, property damage, equipment
damage, and/or personal injury or death.
R410A refrigerant creates toxic gases when burned. Do not
store or use ammable products near the unit.
There is risk of product failure, re, and physical injury or death.
Replace all control box and panel covers after completing
work.
Failure to do so may result in dust or water inltration, causing re, electric
shock, and physical injury or death.
Always wear safety glasses and work gloves when install-
ing the unit. A rapid release of R410A refrigerant may cause
frostbite.
Properly insulate all cold surfaces when installing this product.
Uninsulated cold surfaces may generate condensate that may drip and
cause water damage to wall and oors.
This product is engineered to be used for comfort cooling /
heating. It is not to be used in applications that require
precision cooling or heating such as data centers, food
preservation, wine coolers, refrigeration and / or freezer
applications.
There is risk of property damage.
IMPORTANT!

Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
5
Safety Precautions
Airow restriction devices such as lters shall not exceed the
rated maximum static pressure limits of the indoor unit fan
assembly.
Doing so will cause product malfunction.
Do not install this product outdoors or where it will be
directly exposed to coastal conditions.
Air from the ocean may cause the evaporator ns to corrode, which could
cause product malfunction, improper operation, and shorten the expected
useful life of the product.
Do not install this product in a location that is noise
sensitive. Provide additional acoustical treatment as needed.
The risk is occupants may be discomforted.
When installing refrigerant piping, consider pipe expansion
and use are connections when connecting.
Improper pipe installation may lead to pipe fatigue, failure, and a rapid
release of refrigerant, frostbite, suffocation, physical injury, and or death.
Verify the piping system has been properly evacuated
(<500 ppm), and the system’s refrigerant charge is correct
before commissioning and after any repair is made.
Improper system evacuation and/or an improper refrigerant charge may
cause product malfunction.
Note:
ROUGH-IN, CONTINUED
SAFETY PRECAUTIONS
POWER WIRING
The information contained in this manual is intended for use
by a qualied, experienced service technician who is familiar
with safety procedures and equipped with the proper tools
and test instruments.
Failure to carefully read and follow all instructions in this manual
can result in equipment malfunction, property damage, personal injury or
death.
This equipment uses high voltage electricity. Only a qualied,
experienced electrician should wire this system. Never
assume that the electrical power has been disconnected.
Verify with a meter.
Failure to properly respect electricity, use industry best grounding prac-
tices, follow suggested wiring instructions, local, and NEC codes can lead
to electrical shock, physical injury, seizures, and death.
Use a properly sized circuit protective device. Using an
undersized protective device will lead to equipment malfunc-
tion. Installing an oversized protective device may cause
burns, re, and death.
There is risk of re, electric shock, explosion, physical injury or death.
Do not use a eld-provided communications cable between
the indoor unit and wired zone controllers. Use only LG
provided communications cable. Do not shorten, modify, or
lengthen the LG provided communications power cable.
The product will malfunction.
Properly secure power wires and communications cables at
connectors to eliminate wire strain.
Inadequate connections may generate heat or cause a re and result in
physical injury or death.
Verify all power, ground, and communications wires and
cables are properly terminated before applying power to the
product. Securely tighten all wire terminations.
Improper and/or loose wire and communications cable terminations may
cause product malfunction, re, physical injury or death.
Turn power off at the unit disconnect before servicing.
Electrical shock can cause physical injury or death.
Provide eld-installed electrical isolation devices to protect
sensitive equipment sharing a power source with this product.
Provide sufcient protection against the effects of
electromagnetic elds (EMF) and electrical noise.
Inverter equipment, private power generators, high-frequency
medical equipment, or radio communication equipment may cause the
air conditioner to malfunction.
Provide sufcient electrical system protection against
lighting strikes.
The risk is loss of warranty, product damage, and / or complete loss of
this product.

6
MULTI V Ducted Indoor Unit Installation Manual
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Multi V™ Convertible Surface Mounted and Ceiling Suspended Indoor Units
This manual describes how to install the Multi V™ Convertible Surface Mounted and Ceiling Suspended Indoor Units (IDU). The convertible
surface mounted IDU can be installed on a wall or on the ceiling. The ceiling suspended IDU is intended for ceiling installation only. This
manual covers IDUs listed in Table 1.
Table 1: IDU Model Numbers and Capacities
Unit Model Number Capacity
Multi V™ Convertible ARNU093VEA2 9,600 Btu/h
Multi V™ Convertible ARNU123VEA2 12,300 Btu/h
Multi V™ Ceiling Suspended ARNU183VJA2 19,100 Btu/h
Multi V™ Ceiling Suspended ARNU243VJA2 24,200 Btu/h
These units are part of an LG Variable Refrigerant Flow (VRF) Heating, Ventilation, and Air Conditioning (HVAC) system. All of these units
operate on 208–230 V, 60 Hz, 1-phase power.
Install these unit(s) in the location(s) specified by your architectural blueprints, HVAC system layout drawings, or other appropriate docu-
ments. Perform the installation according to the procedures in this manual. Improper installation may result in injury to or death of personnel,
equipment malfunction or property damage.
INTRODUCTION
Convertible IDU – Floor Mounted
Convertible IDU – Ceiling Mounted
Ceiling Suspended IDU
Additional information on these units is available in the Multi V™ Indoor Unit Engineering Manual available at http://www.lg-vrf.com.
Note:

7
Introduction
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Indoor Units Nomenclature
ARN U07 3TN C
Generation
2 = Second
A = Second, Revision A
Electrical Ratings
3 = 208–230V/60Hz/1Ph
05 = 5,000
07 = 7,000
09 = 9,000
12 = 12,000
15 = 15,000
18 = 18,000
24 = 24,000
Type
U = DC Inverter Heat Pump
Family
ARN = Multi V Indoor Unit
(Refrigerant R410A)
2
B1 = Ducted (low static, convertible)
B2 = Ducted (low static, convertible)
B3 = Ducted (low static, bottom return)
B4 = Ducted (low static, bottom return)
B8 = Ducted (high static)
BG = Ducted (high static)
BH = Ducted (high static)
BR = Ducted (high static)
CE = Floor Standing (small frame)
CF = Floor Standing (large frame)
NJ = Vertical / Horizontal Air Handling Unit
NK = Vertical / Horizontal Air Handling Unit
S5 = Standard Wall Mounted
S8 = Wall Mounted/Mirror
SEL = Standard Wall Mounted
SER = Wall Mounted/Mirror
TJ = 1-Way Ceiling Cassette
TL = 2-Way Ceiling Cassette
TM = 4-Way Ceiling Cassette (3′ x 3′)
TN = 4-Way Ceiling Cassette (3′ x 3′)
TP = 4-Way Ceiling Cassette (3′ x 3′)
TQ = 4-Way Ceiling Cassette (2′ x 2′)
TR = 4-Way Ceiling Cassette (2′ x 2′)
VE = Convertible Surface Mounted
VJ = Ceiling Suspended
Feature
A = Basic
C = Plasma Filter
G = Low Static
L = Neo Plasma
R = Mirror and Neo Plasma
U = Uncased
Nominal Capacity
Model
(Nominal cooling capacity in Btu/h)

8
MULTI V Ducted Indoor Unit Installation Manual
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
UNIT FEATURES
Convertible Surface Mounted Indoor Unit – VE Chassis
Ceiling Suspended Indoor Unit – VJ Chassis
Controls
Drain hose
Air Filter
Supply Air
Left Side Cover
Return Air
Right Side Cover
Air lters
(behind front panel)
Supply air
Vertical louver Horizontal louver
Return air

9
Introduction
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
INSTALLATION PARTS
Table 2 lists installation parts. Be sure all field-provided parts meet appropriate local and national codes. Quantities are per each unit in-
stalled. O=required; X=not used; A/R=as required
Table 2: Installation Parts
Part Qty Field
Supplied?
Convertible
Wall
Mounted
Convertible
Ceiling
Mounted
Ceiling
Suspended
Installation instructions (this manual) 1 No O O O
Installation plate
1 No O X X
Type A screw
with plastic anchor 4 No O X X
Conduit
mounting plate 1 No O O O
Type B screw 2 No O O O
Wall controller and controller cable
(accessory – purchased separately) 1 No Optional O O
Copper pipe: Gas side 3/8” and 1/2,” Liquid side: 1/4” A/R Yes OOO
Insulation materials A/R Yes OOO
Additional drain pipe A/R Yes OOO
Hanging bolt (3/8” or M10)
Nut (3/8” or M10)
Lockwasher (3/8” or M10)
Suspension
bolt
Lock
washer
Hanger
washer
Nut
Lock
washer Flat
washer
Flat
Flat Washer (3/8” or M10)
Hanging bolt ceiling anchors
4
12
4
12
4
Yes
Yes
Yes
Yes
Yes
X
X
X
X
X
O
O
O
O
O
O
O
O
O
O
Communications cable, IDU to ODU: 18 AWG, 2 conductor,
stranded and shielded (minimum) A/R Yes OOO

10
MULTI V Ducted Indoor Unit Installation Manual
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Table 3 lists installation tools. O=required; X=not used; A/R=as required
Table 3: Installation Tools
INSTALLATION TOOLS
Tools Qty Field
Supplied?
Wall
Mounted
Convertible
Ceiling
Mounted
Convertible
Ceiling
Suspended
Level 1 Yes OOO
Screw driver 1 Yes OOO
Electric drill 1 Yes OOO
Hole core drill bit (size A/R) 1 Yes OOO
Flaring tool set 1 Yes OOO
Torque wrenches A/R Yes OOO
Wrench, adjustable 1 Yes OOO
Sleeve, pipe, drain and copper (pipe materials) A/R Yes OOO
Bushing, sleeve for wall penetration A/R Yes OOO
Caulk or sealer for wall penetration A/R Yes OOO
Vinyl tape A/R Yes OOO
Pipe supports A/R Yes OOO
Tube cutter A/R Yes OOO

11
Installation Instructions
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Unpack the Indoor Unit / Inspect for Freight Damage
DO NOT lift the unit by the refrigerant piping or the drain pan pipe stub. Use the hanger brackets or the unit case only to lift the unit. Damage
to the piping components may occur.
After opening, if the unit is damaged, repack the unit as it was shipped to you. RETAIN ALL PACKING MATERIALS. In general, freight
damage claims will be denied if the original packing materials are not retained for the claims adjustor to inspect. Contact your supervisor for
instructions to le a freight claim and order a replacement unit.
Note:
Note:
ROUGHING IN
Do not move or lift the boxed or unboxed unit alone. Use at least two people to lift the unit.
The unit is heavy. Lifting it alone can result in severe injury.
1. Before opening, check the unit model number on the box. Verify it is the correct capacity, unit type, and voltage. Refer to
the Nomenclature chart on page 7.
2. Move the box to a convenient location near the installation site before removing the shipping and protective materials.
3. Place the box on a solid surface.
4. Cut the white reinforced nylon straps.
5. Open the top of the box and fold back all four flaps.
6. Remove the protective cardboard / Styrofoam®top sheet and place to the side
7. The cover panels are not attached to the box. Lift the cardboard carton by the flaps and place it to the side.
8. Remove the plastic moisture barrier.
9. Check the unit nameplate data and model number. Verify the unit voltage, and capacities are correct before proceeding.
10. Locate and retain the included installation parts.
11. Locate and retain the installation manual.
12. Check the supply and return air grilles for obstructions.
13. Lift the unit and inspect for freight damage. If damage is found, repack the unit as it was received in the original container.
Contact your supervisor for instructions to file a freight claim and order a replacement unit.

12
MULTI V Convertible and Ceiling Suspended Indoor Units Installation Manual
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Location Selection
Refer to Figure 1 for clearance dimensions for the ceiling suspended unit. Refer to Figure 2 for clearance dimensions for the convertible unit,
both ceiling mounted and wall mounted.
Note:
The ceiling suspended unit and the ceiling mounted convertible unit have different clearance dimensions.
Choose a location that conforms to the following:
• The structure will support the weight of the unit and accessories.
• The mounting location is strong and solid enough to prevent vibrations.
• Allows the unit to easily be hung in a level position.
• Provides clearance around the unit considering refrigerant piping, condensate line installation, control panel, and major component
maintenance access.
• Is free from electrical noise caused by nearby generators and high voltage wiring.
• Is away from airborne sources of grease, steam, excessive heat, flammable substances, salt, and/or acidic vapors.
• Ambient airborne particulate is at nominal levels.
• Select a location with no obstacles in front of the unit and where the condensation drain pipe can be conveniently routed away.
• For the convertible unit, ensure there is a space of more than 7 7/8” between walls and the left and right sides. Also ensure there is a space
of more than 2” between the bottom of the unit and the wall or floor. If installing on a wall, position the unit as low on the wall as possible,
but more than 2” above the floor.
• For the ceiling suspended unit, ensure there is a space of more than 27 9/16” between walls and the left and right sides. Also ensure there
is a space of more than 11 3/16” between the rear of the unit and the wall.
• Do not install the unit near a source of heat or steam, in a doorway, or near high-frequency generators.
• Do not install where sulfurous acid gas or corrosive gas is generated.
• Do not install where cooking oil or iron powder are generated or where flammable gas is generated, flows, stored, or vented.
ROUGHING IN
Overview
More than
7-7/8 inches
More than
2 inches
More than
7-7/8 inches
More than
7-7/8 inches
More than
2 inches
More than
7-7/8 inches
More than
27-9/16 inches
More than
11-13/16 inches
More than
27-9/16 inches
Figure 1: Ceiling Suspended Unit Clearance Dimensions.
Figure 2: Convertible Surface Mounted Unit Clearance Dimensions.

13
Installation Instructions
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
ROUGHING IN
Convertible Indoor Unit
1. Refer to Figure 3. Remove the five screws securing the front
cover to the chassis.
2. Release the three clips securing the front cover to the chassis.
3. Pull front panel upward and remove panel from chassis.
4. Pull the side covers upward to connect the piping..
5. Remove the piping knock-out from the side cover. Be sure to
smooth the edges where the knock-out is removed.
6. Remove the rubber stopper from the desired drain side.
7. Connect the drain pipe to the unit’s drain stub. Be sure the
connection is watertight.
Preparing for Installation
Figure 3: Preparing for Installation
Clips
Screws
1. Be sure the mounting location is strong enough to prevent
vibration.
2. Position the mounting plate at the installation location on the
wall. Be sure to allow for the spacing as shown in Figure 4.
3. Use the level to be sure the mounting plate is level.
4. Mount the installation plate on the wall with six Type A screws
as shown in Figure 5. If installing on a concrete wall, use field-
supplied concrete anchor bolts.
Wall Mounting the Convertible Unit
Use caution when selecting the mounting location. Determine where
existing wiring and/or piping are routed through the wall and avoid
these areas when mounting the plate and drilling access holes in
the wall.
Note:
Installation plate
Left rear piping Right rear piping
Floor
2-3/4
inches
4-3/4 inches
more than
7-7/8 inches
Ø2-3/4 inch Ø2-3/4 inch
2-3/4
inches
Installation Plate
Type "A" screw
Figure 4: Mounting Plate Location Figure 5: Secure Mounting Plate

14
MULTI V Convertible and Ceiling Suspended Indoor Units Installation Manual
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Convertible Indoor Unit
ROUGHING IN
1. Be sure the mounting location is strong enough to prevent
vibration.
2. Refer to Figure 6. Measure and mark the positions of the hang-
ing bolts and the piping hole.
3. Drill holes in the ceiling for the four ceiling anchor bolts.
4. Insert the nuts and washer onto the hanging bolts to lock the
bolts on the ceiling.
5. Firmly mount the hanging bolts to the anchor nuts.
6. Refer to Figure 7. Secure the unit hangers on the hanging bolts
with nuts, washers and lock washers.
7. Before final tightening of the nuts, determine at what angle the
unit will be positioned. Refer to Figure 8 for examples of correct
and incorrect positioning. The unit must be positioned so that
condensation will flow from the unit through the drain pipe.
8. Adjust the nuts to position the unit as desired. Tighten the nuts to
prevent the unit shifting position.
Ceiling Mounting the Convertible Unit
Use caution when selecting the mounting location. Determine where
existing wiring and/or piping are routed through the ceiling and avoid
these areas when mounting the unit and drilling access holes.
Note:
Figure 6: Convertible Unit Ceiling Mounting
Figure 7: Detail of Securing Hanging Bolts
Suspension bolt
piping hole
(Ø1-3/4 inches)
9-1/4 inches
2 inches
3-5/16 inches
32-1/4 inches
1-9/16 inches
Washer
Nut
Suspension
bolts
Ceiling
Anchor nut
Reference
of piping
hole ( Ø 1-3/4 inches)
Suspension
bolts
Spring
washer
Max.
12mm
Hanger
Washer
Nut
Firmly tighten the nuts and bolts to prevent the unit from
falling.
Prepare Refrigerant Pipes for
Installation
1. Press on the upper side of the pipe clamp.
2. Slowly unfold the pipes downward as shown in Figure 9. Do not
move the pipes outward as shown in Figure 10.
3. Carefully bend the pipes to the left side of the chassis. Refriger-
ant pipes will be connected in a later step.
Figure 8: Positioning the Ceiling Mounted Unit
Suspension
bolt
Lock
washer
Hanger
washer
Nut
Lock
washer Flat
washer
Flat
Ceiling
Ceiling
10~20mm
(3/8~3/4 inch)
5~10mm
(3/16 to 3/8 inch)
Front View
Side View

15
Installation Instructions
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
ROUGHING IN
Ceiling Suspended Unit
Figure 9: Correct Pipe Movement
1. Be sure the mounting location is strong enough to prevent
vibration.
2. Refer to Figure 11. Measure and mark the positions of the
hanging bolts and the piping hole.
3. Drill holes in the ceiling for the four ceiling anchor bolts.
4. Insert the nuts and washer onto the hanging bolts to lock the
bolts on the ceiling.
5. Firmly mount the hanging bolts to the anchor nuts.
6. Refer to Figure 7. Secure the unit hangers on the hanging bolts
with nuts, washers and lock washers.
7. Before final tightening of the nuts, determine at what angle the
unit will be positioned. Refer to Figure 8 for examples of correct
and incorrect positioning. The unit must be positioned so that
condensation will flow from the unit through the drain pipe.
8. Adjust the nuts to position the unit as desired. Tighten the nuts
to prevent the unit shifting position.
Mounting the Ceiling Suspended Unit
Use caution when selecting the mounting location. Determine where ex-
isting wiring and/or piping are routed through the ceiling and avoid these
areas when mounting the unit and drilling access holes.
Note:
Firmly tighten the nuts and bolts to prevent the unit from
falling.
Hanging bolt
12 5/8”
33 11/16”
Washer
Nut
Suspension
bolts
Ceiling
Anchor nut
Hanging
bolts
Lock
washer
Hanger
Washer
Nut
Both the convertible and the ceiling suspended units use the gravity
drain method for removing condensation. If a pump is required, it
must be field provided and installed.
1. Refer to Figure 12. Use a hole core drill to make a hole in the
wall for the refrigerant and drain piping. Be sure to avoid pipes,
wiring, and other obstructions in the wall.
2. Route the drain pipe through the hole.
3. Ensure drain pipe is in a safe position. It will be routed to its final
position in a later step.
Routing the Drain Pipe
Improper drain pipe connection and/or routing can cause unit
malfunction/damage and water damage to property.
Note:
3/16~5/16 inch
Indoor
WALL
Outdoor
Figure 10: Incorrect Pipe Movement
Figure 11: Ceiling Suspended Unit Mounting
Figure 12: Drill Drain Pipe Hole

16
MULTI V Convertible and Ceiling Suspended Indoor Units Installation Manual
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
1. Figure 13 shows a typical zone controller. Your controller may be different. Choose a good location. Proper indoor unit operation depends
on the location of the room sensor. A good location will protect the zone controller from direct sunlight and external local sources of water
vapor, and heated or cooled air. If no mounting height was specified by the building designer, place the handy box approximately
55 inches above the finished floor.
2. Pull LG communications cable between the zone controller handy box and the indoor unit. A 30 foot cable comes with the wall-mounted
zone controller.
3. Store a minimal amount of cable in the handy box. Coil and store any remaining cable near the indoor unit control panel.
4. If the cable between the zone controller and the indoor unit is too long, do not cut the cable and shorten. Coil any spare communications
cable, tie-wrap it, and leave it next to the indoor unit location.
5. Zone controller rough-in is complete.
Roughing-In Wall-Mounted Zone Controllers
Note:
• Depending on controller model, zone controller handy boxes
may need to be metric. Check with your LG applied represen-
tative to verify which type of handy box is needed for the zone
controller in question.
• Use only LG-supplied communications cable. Using field-sup-
plied cable may result in communications problems between the
zone controller and the indoor unit.
• If additional cable length is needed, order an LG Wired
Remote Group Control Extension Cable (30 feet)
(Model No. PZCWRC1).
• DO NOT cut the quick-connect plugs off or adjust the length of
the cable.
• Keep the communications cable away from high voltage wires
and electromagnetic field (EMF) producing equipment.
• Do not route power wiring and communications cables in the
same conduit.
• Maintain the minimum distance required between the com-
munications cable and power wiring. The minimum required
space between the two is dependent on the voltage of the
power wiring. Refer to the appropriate Multi V™ Outdoor Unit
Engineering Manual for minimum distance specifications.
Cooling Heating Auto Dry Fan
Defrost Preheat Out door
Slo
Lo
Med
Hi
Po
Room Temp
Total on
Central Run
Figure 13: Typical Zone Controller

17
Piping
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.
INDOOR UNIT PIPING CONNECTIONS
Refrigerant Safety
ASHRAE Standards 15-2010 and 34-2010 offer guidelines that address refrigerant safety and the maximum allowable concentration of
refrigerant in an occupied space. Refrigerant will dissipate into the atmosphere, but a certain volume of air is required for this to occur safely.
For R410Arefrigerant, the maximum allowable concentration of refrigerant is twenty-six (26) lbs. per 1,000 cubic feet of an occupied space.
Buildings with twenty-four (24) hour occupancy allow half of that concentration.1
ASHRAE Standards 15 and 34 assume that if a system develops a leak, its entire refrigerant charge will dump into the area where the leak
occurs. To meetASHRAE Standards 15 and 34, calculate the refrigerant concentration that may occur in the smallest room volume on the
system, and compare the results to the maximum allowable concentration number.1Also consult state and local codes in regards to
refrigerant safety.
1 Information aboutASHRAE Standard 15-2010 / 34-2010 and addenda current as of the date of this publication
Verifythemaximumrefrigerantconcentrationlevelinthespacewheretheindoorunitwillbemountedmeetstheconcentrationlimitfortheapplication.
Refrigerant Pipe Supports
Aproperly installed pipe system has sufficient support so that pipes do not sag during the life of the system (Figure 14).As necessary, place supports
closer for segments where potential sagging could occur. Maximum spacing of pipe supports shall meet local codes.
Max. 12"
~ 12" – 19"
A
B
A+ B ~ 12" – 19"
Support Location
Refrigerant Pipe Specifications
Use drawn or annealed tempered air conditioning and refrigeration (ACR) copper tubing that meetsASTM B-280 standards. Table 4 lists
pipe sizes for the convertible and ceiling suspended units. Choose tube wall thickness to meet local code, UL, and approved for an operat-
ing pressure of 551 psig. When bending soft copper tubing, use the largest radius bends practical to reduce the equivalent length of installed
pipe. Be sure no traps or sags are present when rolling out soft copper tubing.
Unit Model Number Pipe Sizes (in, OD)
Liquid Line Vapor Line Condensate Drain
Multi V™ Convertible ARNU093VEA2 1/4 Flare 1/2 Flare 5/8
Multi V™ Convertible ARNU123VEA2 1/4 Flare 1/2 Flare 5/8
Multi V™ Ceiling Suspended ARNU183VJA2 1/4 Flare 1/2 Flare 5/8
Multi V™ Ceiling Suspended ARNU243VJA2 3/8 Flare 5/8 Flare 5/8
Figure 14: Refrigerant Pipe Support Locations
Table 4: Pipe Specifications

18
MULTI V Convertible and Ceiling Suspended Indoor Units Installation Manual
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Brazed Connections
Indoor units come with flare type connections. It is the installer’s option to use the flare fittings provided or braze the indoor unit to the
refrigerant piping system. Follow the procedure below for brazing.
All joints are brazed in the field. Multi V outdoor unit refrigeration system components contain very small
capillary tubes, small orices, electronic expansion valves, oil separators, and heat exchangers that can
easily become blocked. Proper system operation depends on the installer using best practices and utmost
care while assembling the piping system.
When brazing, ALWAYS follow these guidelines:
• Keep pipe supplies capped, clean, and store in a dry location.
• Use a tubing cutter to cut the pipe; do not use a saw. De-burr and clean all cuts before assembly. Blow clean the pipe with dry nitrogen
prior to assembly.
• Do not use flux, soft solder, or anti-oxidant agents. Use a 15% silver phosphorous copper brazing alloy to produce good flow and avoid
overheating.
• While brazing, protect refrigerant shut-off valves (optional, field provided), electronic expansion valves, unit case, insulation, and control
components from excessive heat by using a wet rag or a heat barrier spray product.
• While brazing, always use a dry nitrogen purge operating at a minimum pressure of three (3) psig and maintain a steady flow.
• Use adapters to assemble different sizes of pipe.
• Use an LG accessory piping kit or purchase pipes locally.
Note:
Pressure-reducing
Valve
Valve
Taping
Nitrogen
Pipe to
be brazed
Refrigerant
Piping
Flare Connections
Indoor units come with flare type connections on refrigerant pipes. It is the installer’s option to use the flare fittings provided or braze the
indoor unit to the refrigerant piping system (Figure 15).
Flare Fittings
• All unit flare fittings are 45° and rated for high pressure refrigerant R410A.
• Properly form all flare fittings using best practices.
Important!
Do not use any other type of oil (including traditional POE refrigeration oil) as a lubricant. Failure to follow
this procedure may lead to restrictions in the refrigeration components.
Note:
• Place a drop of PVE oil on the fitting threads before tightening.
• Do not over-tighten flare nuts. Excessive tightening will cause fittings to crack.
REFRIGERANT PIPE CONNECTIONS
Figure 15: Typical Refrigerant Pipe Brazing

19
Piping
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
CONDENSATION PIPE CONNECTION
While making condensate pipe connections, be careful not to exert lateral force on the drain nipple. Internal
damage may occur.
Note:
Condensate Pipe Connection
The ceiling suspended and convertible indoor units use the gravity
drain method for removal of condensation. All units ship with a flex-
ible drain pipe kit. Note the following when connecting the conden-
sate pipe to the indoor unit.
• Indoor units DO NOT come with condensate pumps, check valves,
or a backflow prevention device. If these items are needed, they
are to be field supplied.
• All horizontal segments of condensate pipe should be sloped a
minimum of 1/4 inch per foot away from the indoor unit.
• Verify the unit is installed at a slight angle down toward the gravity
drain connection.
• Remove the rubber plug prior to connecting the condensate line to
the indoor unit.
• Use materials acceptable by local code.
1. Locate the condensate pipe extension and determine how you
will route it to its drainage area.
2. Route the pipe, leaving enough pipe near the indoor unit to form
the condensate trap and to connect to the indoor unit’s conden-
sate pipe.
3. Connect the indoor unit’s condensate pipe to the drain pipe
extension. Use appropriate materials to make the connection
watertight. Be sure the condensate pipe slopes downward
(Figure 16) after leaving the indoor unit.
4. Form the condensate pipe into a trap as shown in and use ap-
propriate attaching materials to ensure the pipe remains in this
shape.
5. Ensure the condensate drain pipe is not configured as shown in
Figure 17..
Do not raise Accumulated
drain water
Tip of drain hose
dipped in water
Air
Waving
Water
leakage
Water
leakage Ditch
Less than
50mm gap
Water
leakage
Downward slope
Figure 16: Condensate Pipe Downward Slope
Figure 17: Incorrect Condensate Pipe Installation

20
MULTI V Convertible and Ceiling Suspended Indoor Units Installation Manual
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Check Condensate Pipe Drainage
Perform this procedure to verify the drain pipe will remove condensation from the unit as intended (Figure 18).
1. Remove the air filters from the indoor unit
2. Position the air direction louvers by hand to allow access to the evaporator coil.
3. For a wall-mounted converible unit, carefully pour a glass of water on the evaporator coil.
4. For a ceiling-mounted convertible unit or a ceiling suspended unit, carefully pour or spray water on the coil.
5. Ensure the water flows through the drain hose of the indoor unit without any leakage and goes out the drain exit.
6. Ensure the drain hose points downward from the unit for easy drain flow.
7. If necessary, reposition drain hose to allow proper flow.
CONNECT DRAIN PIPE
Figure 18: Verify Proper Condensate Drainage