LG MULTI V ARNU363DDB4 User manual

Models
ARNU363DDA4
ARNU363DDB4
ARNU483DDA4
ARNU483DDB4
ARNU603DDA4
ARNU603DDB4
ARNU723DDA4
ARNU723DDB4
36,000 to 72,000 Btu/h
SPLIT ROOFTOP UNIT
INSTALLATION MANUAL

For continual product development, LG Electronics U.S.A., Inc. reserves the right to change specifications without notice.
© LG Electronics U.S.A., Inc.
PROPRIETARY DATA NOTICE
For more technical materials such as submittals, catalogs, engineering,
owner’s, best practices, and service manuals, visit www.lghvac.com.
Do not throw away, destroy, or lose this manual.
Please read carefully and store in a safe place for future reference.
Content familiarity is required for proper installation.
The instructions included in this manual 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 by the summary list of safety precautions on page 4.
This document, as well as all reports, illustrations, data, information,
and other materials are the property of LG Electronics U.S.A., Inc., and are
disclosed by LG Electronics U.S.A., Inc. only in confidence.

3
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.
TABLE OF CONTENTS
Safety Precautions ...................................................................................................................................................................................................... 4-7
Unit Nomenclature.......................................................................................................................................................................................................... 8
Introduction ............................................................................................................................................................................................................... 9-10
Split Rooftop Unit Product Overview .................................................................................................................................................................... 11-20
General Data .................................................................. 11-12
Electrical Data ............................................................................................................................................................................................................ 13
Interior Components.............................................................................................................................................................................................. 14-15
Control Box Components ........................................................................................................................................................................................... 16
Dimensions................................................................................................................................................................................................................. 17
Refrigerant Flow Diagram...................................................................................................................................................................................... 18-20
Split Rooftop Unit Installation Guidelines............................................................................................................................................................. 21-29
Refrigerant Safety......................................................................................................................................................................................................... 30
General Refrigerant Piping System ....................................................................................................................................................................... 31-32
Refrigerant Piping ................................................................................................................................................................................................... 33-36
Duct Connections.................................................................................................................................................................................................... 37-38
Roof Ductwork Conguration ..................................................................................................................................................................................... 39
Piping Connections ................................................................................................................................................................................................ 40-41
Condensate Piping Information ............................................................................................................................................................................. 42-43
Electrical Information.............................................................................................................................................................................................. 44-62
Installation Checklist .............................................................................................................................................................................................. 63-64

4
MULTI V Split Rooftop Unit Unit Installation Manual
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.
TABLE OF SYMBOLS
This symbol indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
This symbol indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION
This symbol indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
This symbol indicates situations that may result in equipment or property damage accidents only.
This symbol indicates an action that should not be performed.
The instructions below must be followed to prevent product malfunction, property damage, injury or death to the user or other people. Incor-
rect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the symbols described
below.
SAFETY PRECAUTIONS
Do not install or remove the unit by yourself (end user).
Ask the dealer or an LG trained technician to install the unit.
Improper installation by the user will result in re, explosion, electric
shock, physical injury or death.
For replacement of an installed unit, always contact an LG
trained service provider.
There is risk of re, electric shock, explosion, and physical injury or
death.
Wear protective gloves when handling equipment. Sharp
edges will cause personal injury.
Do not change the settings of the protection devices.
If the protection devices have been bypassed or are forced to operate
improperly, or parts other than those specied by LG are used, there is
risk of re, electric shock, explosion, and physical injury or death.
Replace all control box and panel covers.
If cover panels are not securely installed, dust, water, and animals will
enter the outdoor unit, causing re, electric shock, and physical injury or
death.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Exposure to high concentration levels of refrigerant gas will lead to
illness or death.
Periodically check that the outdoor frame is not damaged.
There is a risk of explosion, physical injury, or death.
If the air conditioner is installed in a small space, take
measures to prevent the refrigerant concentration from
exceeding safety limits in the event of a refrigerant leak.
Consult the latest edition of American Society of Heating,
Refrigerating, and Air Conditioning Engineers (ASHRAE) Standard 15.
If the refrigerant leaks and safety limits are exceeded, it could result in
personal injuries or death from oxygen depletion.
The heat recovery unit must be installed indoors; do not
install the heat recovery unit in a highly humid environment.
There is risk of physical injury or death due to electric shock.
Dispose of the packing materials safely.
• Packing materials, such as nails and other metal or wooden parts,
will cause puncture wounds or other injuries.
• Tear apart and throw away plastic packaging bags so that children
will not play with them and risk suffocation and death.
Install the unit considering the potential for strong winds or
earthquakes.
Improper installation will cause the unit to fall over, resulting in physical
injury or death.
Install the unit in a safe location where nobody can step, fall
onto it, or place objects on it. Do not install the unit on a
defective stand.
It will result in an accident that causes physical injury or death.
INSTALLATION
Do not store or use ammable gas or combustibles near
the unit.
There is risk of re, explosion, and physical injury or death.
Do not supply power to the unit until all wiring and piping
are completed or reconnected and checked.
There is risk of physical injury or death due to electric shock.
DANGER
DANGER

5
Safety Precautions
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.
SAFETY PRECAUTIONS
Be very careful when transporting the product. There is a risk of the product falling and causing physical injury.
• Use appropriate moving equipment to transport each frame; ensure the equipment is capable of supporting the weights listed.
• Some products use polypropylene bands for packaging. Do not use polypropylene bands to lift the unit.
• Suspend the outdoor unit from the base at specified positions (at a minimum of six [6] points) to avoid slippage from rigging apparatus.
LG Electronics U.S.A., Inc., is not responsible for any piping
calculations, refrigerant leaks, degradation of performance,
or any other potential problems or damages as a result of
interconnecting piping, their joint connections, isolation
valves, introduced debris inside the piping system, or other
problems caused by the interconnecting piping system.
Do not install the product where it is exposed directly to
ocean winds.
Sea salt in the air will cause the product to corrode. Corrosion,
particularly on the condenser and evaporator ns, could cause product
malfunction or inefcient operation.
When installing the outdoor unit in a low-lying area, or a lo-
cation that is not level, use a raised concrete pad or concrete
blocks to provide a solid, level foundation.
This prevents water damage and abnormal vibration.
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as uninsulated piping can generate condensate that
will drip and cause a slippery surface condition and / or water damage
to walls.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Low refrigerant levels will cause product failure.
Do not make refrigerant substitutions. Use R410A only.
If a different refrigerant is used, or air mixes with original refrigerant, the
unit will malfunction and damage will occur.
Do not store or use ammable gas / combustibles near
the unit.
There is a risk of product failure.
Do not use the product for mission critical or special pur-
pose applications such as preserving foods, works of art, or
other precision air conditioning applications. The equipment
is designed to provide comfort cooling and heating.
There is risk of property damage.
Keep the unit upright during installation to avoid vibration or
water leakage.
When installing the unit in a hospital, mechanical room, or
similar electromagnetic eld (EMF) sensitive environment,
provide su󰀩cient protection against electrical noise.
Inverter equipment, power generators, high-frequency medical
equipment or radio communication equipment will cause the air con-
ditioner to operate improperly. The unit will also affect such equipment
by creating electrical noise that disturbs medical treatment or image
broadcasting.
The heat recovery box must be installed indoors; do not
install the heat recovery box in a highly humid environment.
There is risk of product failure and property damage.
When connecting refrigerant piping, remember to allow for
pipe expansion.
Improper piping installation will cause system malfunction.
Do not install the outdoor unit or heat recovery unit in a
noise-sensitive area.
Take appropriate actions at the end of HVAC equipment life
to recover, recycle, reclaim, or destroy R410A refrigerant
according to applicable U.S. Environmental Protection
Agency (EPA) rules.
Periodically check that the outdoor frame is not damaged.
There is a risk of equipment damage.
Install the unit in a safe location where no one can step on or
fall onto it. Do not install the unit on a defective stand.
There is a risk of unit and property damage.
Install the drain hose to ensure adequate drainage.
There is a risk of water leakage and property damage.
CAUTION
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as uninsulated piping can generate condensate that could drip, causing a slippery surface that creates a risk of slipping, falling,
and personal injury.

6
MULTI V Split Rooftop Unit Unit Installation Manual
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.
SAFETY PRECAUTIONS
Do not supply power to the unit until all electrical wiring,
controls wiring, piping, installation, and refrigerant system
evacuation are completed.
The system will malfunction.
The information contained in this manual is intended for use
by an industry-qualied, experienced, licensed electrician
familiar with the NEC who is equipped with the proper tools
and test instruments.
Failure to carefully read and follow all instructions in this manual can
result in equipment malfunction and property damage.
The information contained in this manual is intended for use
by an industry-qualied, experienced, trained electrician
familiar with the NEC who is equipped with the proper tools
and test instruments.
Failure to carefully read and follow all instructions in this manual can
result in personal injury or death.
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 NEC, and the instructions given in this
manual.
If the power source capacity is inadequate or the electric work is not
performed properly, it will result in re, electric shock, physical injury or
death.
Refer to local, state, and federal codes, and use power wires
of su󰀩cient current capacity and rating.
Wires that are too small will generate heat and cause a re, and physical
injury or death.
Secure all eld wiring connections with appropriate wire
strain relief.
Improperly securing wires will create undue stress on equipment power
connections. Inadequate connections will generate heat, cause a re,
and physical injury or death.
Ensure the system is connected to a dedicated power source
that provides adequate power.
If the power source capacity is inadequate or the electric work is not
performed properly, it will result in re, electric shock, physical injury or
death.
Properly tighten all power connections.
Loose wiring will overheat at connection points, causing a re, physical
injury or death.
Do not change the settings of the protection devices.
If the protection devices have been bypassed or is forced to operate
improperly, or parts other than those specied by LG are used, there is
risk of re, electric shock, explosion, and physical injury or death.
WIRING
High voltage electricity is required to operate this system.
Adhere to the U.S. National Electric Codes (NEC) and these
instructions when wiring.
Improper connections and inadequate grounding can cause accidental
injury or death.
Always ground the unit following local, state, and NEC codes.
There is risk of re, electric shock, and physical injury or death.
Turn the power o󰀨 at the nearest disconnect before servicing
the equipment.
Electrical shock can cause physical injury or death.
Properly size all circuit breakers or fuses.
There is risk of re, electric shock, explosion, physical injury or death.
Do not share the electrical circuit with other devices.
There is risk of re, electric shock, and physical injury or death due to
heat generation.
Do not use damaged or loose power wiring. Do not
modify or extend the outdoor unit’s power wiring. Ensure that
the power wiring will not be pulled nor weight be placed on
the power wiring during operation.
There is risk of re, electric shock, and physical injury or death.
DANGER

7
Safety Precautions
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.
SAFETY PRECAUTIONS
Do not allow water, dirt, or animals to enter the unit.
There is risk of re, electric shock, physical injury or death.
Do not operate the unit with the panel(s) or protective
cover(s) removed; keep ngers and clothing away from
moving parts.
The rotating, hot, cold, and high-voltage parts of the unit can cause
physical injury or death.
Do not touch the refrigerant piping during or after
operation.
It can cause burns or frostbite.
Do not open the inlet during operation.
There is risk of electric shock, physical injury or death.
OPERATION
Do not provide power to or operate the unit if it is ooded
or submerged.
There is risk of re, electric shock, physical injury or death.
Use a dedicated breaker for this product.
There is risk of re, electric shock, physical injury or death.
Do not operate the disconnect switch with wet hands.
There is risk of re, electric shock, physical injury or death.
Periodically verify the equipment mounts have not
deteriorated.
If the base collapses, the unit could fall and cause physical injury or death.
Use inert (nitrogen) gas when performing leak tests or air
purges. Do not use compressed air, oxygen, or ammable
gases.
Using these substances will cause re, explosion, and physical injury or
death.
If refrigerant leaks out, ventilate the area before operating the
unit.
If the unit is mounted in an enclosed, low-lying, or poorly ventilated area,
and the system develops a refrigerant leak, it will cause a re, electric
shock, explosion, physical injury or death.
To avoid physical injury, use caution when cleaning or servicing the air conditioner.
There is risk of electric shock, physical injury or death.
Clean up the site after servicing is nished, and check that
no metal scraps, screws, or bits of wiring have been left
inside or surrounding the unit.
Do not use the product for mission critical or special pur-
pose applications such as preserving food, works of art, or
other precision air conditioning applications. The equipment
is designed to provide comfort cooling and heating.
There is risk of property damage.
Do not allow water, dirt, or animals to enter the unit.
There is risk of unit failure.
Do not open the inlet during operation.
There is risk of unit failure.
Do not operate the unit with the panel(s) or protective
cover(s) removed; keep ngers and clothing away from
moving parts.
Non-secured covers can result in malfunction due to dust or water in the
service panel.
Periodically verify the equipment mounts have not
deteriorated.
If the base collapses, the unit could fall and cause property damage or
product failure.
Use only a soft cloth to clean the air conditioner. Do not
use wax, thinner, or strong detergents.
Strong cleaning products will damage the surface of the air conditioner,
or cause its appearance to deteriorate.
Provide power to the outdoor unit to warn the compressor
crankcase at least six (6) hours before operation begins.
Starting operation with a cold compressor sump(s) will result in severe
bearing damage to the compressor(s). Keep the power switch on during
the operational season.
Do not turn o󰀨 the main power switch after operation has
been stopped.
Wait at least ve (5) minutes before turning off the main power switch,
otherwise it will result in product malfunction.
Do not block the inlet or outlet.
Unit will malfunction.
Auto-addressing must be performed after connecting the
power of all Split Rooftop Unit and outdoor units.
Auto-addressing must also be performed after servicing a Split Rooftop
Unit.
CAUTION
DANGER

8
MULTI V Split Rooftop Unit Installation Manual
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.
UNIT NOMENCLATURE
ARN U36 3DD A
Generation
4 = Fourth
Electrical Ratings
3 = 208/230V, 60Hz, 1Phase
36 = 36,000 Btu/h
48 = 48,000 Btu/h
60 = 60,000 Btu/h
72 = 72,000 Btu/h
Type
U = DC Inverter Heat Pump
Family
ARN = Multi V Indoor Unit
(Refrigerant R410A)
DD = Split Rooftop Unit
Series
A = Heat Recovery Type
B = Heat Pump Type
Cooling Capacity
Model
4

9
Product Data
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.
Safety
• Safety of personnel is the primary concern during all procedures.
• Read and understand the safety summary at the front of this manual.
• Read and understand this installation procedure before beginning installation.
• Use the appropriate tools and accessories during installation.
• Plan your work and do not work alone, if possible.
• Know how to obtain emergency medical and firefighting assistance.
Installation Personnel
This equipment is intended for installation by personnel trained in the required construction, mechanical, electrical, and/or other disciplines.
Applicable Codes
Personnel must be familiar with and follow the applicable national, state, and/or local codes.
Installation work must be performed by trained personnel and in ac¬cordance with national wiring standards and all local or
other applicable codes. Improper installation can result in re, electric shock, physical injury, or death.
Please read all instructions before installing this product. Become familiar with the unit, its components and connections, and
the order of installation. Incorrect installation can degrade or prevent proper operation.
INTRODUCTION
Figure 1: RTU.
This manual describes how to install LG Split Rooftop Unit (RTU) for Multi V Variable Refrigerant Flow (VRF) heat pump and heat recovery
systems. Refer to LG’s Split Rooftop Unit Engineering Manual for complete detailed engineering data and selection procedures.

10
MULTI V Split Rooftop Unit Installation Manual
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.
Required Tools (field provided)
• Level
• JIS screwdriver
• Electrical lineman pliers
• Electric drill
• Holesaw
• Drill
• R410A flaring tool set
• Tubing cutter
• Tube/pipe reamer
• Refrigerant gas-leak detector
• Thermometer
Required Parts (field provided)
• Pipes - vapor line and liquid line, with insulation
• 3/8” or 1/2” nuts, flat washers, and lock/split washers
• 3/8” or 1/2” threaded hanger rods
• Insulated drain hose
• Additional drain hose
• Connecting cable (power and control)
INTRODUCTION

11
Product Data
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.
Table 1: ARNU363~723DDA4 General Data.
General Data
EEV: Electronic Expansion Valve
Power wiring is eld supplied and must comply with the applicable local and national
codes.
This unit comes with a dry nitrogen charge.
Rated capacity is certied under AHRI Standard 1230. Ratings are subject to change
without notice. Current certied ratings are available at www.ahridirectory.org.
1Max power input is rated at maximum setting value.
2Low ambient performance with LGRED° heat technology is included in Multi V 5 Air
Source Units produced after February 2019.
3Take appropriate actions at the end of HVAC equipment life to recover, recycle, reclaim or
destroy R410A refrigerant according to applicable regulations (40 CFR Part 82, Subpart F)
under section 608 of CAA.
4Sound Pressure levels are tested in an anechoic chamber under ISO Standard 3745.
5All communication cable to be minimum 18 AWG, 2-conductor, twisted, stranded, shielded
and must comply with applicable local and national codes. Ensure the communication
cable is properly grounded at the main outdoor unit only. Do not ground the ODU-IDU
communication cable at any other point.
Model No. ARNU363DDA4 ARNU483DDA4 ARNU603DDA4 ARNU723DDA4
Cooling Mode Performance
Capacity (Btu/h) 36,000 48,000 60,000 72,000
Max Power Input1(W) 640 700 760 770
L / M / H Power Input at Factory Default (W) 110 / 130 / 150 120 / 150 / 260 130 / 250 / 330 140 / 260 / 350
Heating Mode Performance
Capacity (Btu/h) 38,000 52,000 71,000 80,000
Max Power Input1(W) 640 700 760 770
L / M / H Power Input at Factory Default (W) 110 / 130 / 150 120 / 150 / 260 130 / 250 / 330 140 / 260 / 350
Entering Mixed Air
Cooling Max. (°F WB) 76 76 76 76
Heating Min. (°F DB)259 59 59 59
Unit Data
Refrigerant Type3R410A R410A R410A R410A
Refrigerant Control EEV EEV EEV EEV
Sound Power4dB(A) (H/M/L) 66 / 63 / 60 67 / 64 / 61 68 / 65 / 62 69 / 66 / 63
Net Unit Weight (lbs.) 472 472 472 472
Shipping Weight (lbs.) 494 494 494 494
Communication Cable5(No. x AWG) 2 x 18
Fan
Type 3D Plug
Motor 1 1 1 1
Motor / Drive ECM (Electronically Commutated Motor) / Direct
Airflow Rate H/M/L (CFM) Standard Mode 1200 / 1000 / 800 1400 / 1200 / 950 1700 / 1300 / 1000 1800 / 1400 / 1100
External Static Pressure (in. wg) Standard Mode 1.7 1.6 1.5 1.4
External Static Pressure (in. wg) 0.2 - 1.7 0.2 - 1.6 0.2 - 1.5 0.2 - 1.4
Piping
Liquid Line (in., O.D.) 3/8 Brazed 3/8 Brazed 3/8 Brazed 3/8 Brazed
High Pressure Vapor Line (in, OD) 1/2 Brazed 1/2 Brazed 5/8 Brazed 5/8 Brazed
Low Pressure Vapor Line (in., O.D.) 5/8 Brazed 5/8 Brazed 3/4 Brazed 3/4 Brazed
Condensate Line (in., I.D.) 1, Plain
Filtration
Outdoor 2” Merv8 (16” x 20”) x 4 each
PRODUCT OVERVIEW

12
MULTI V Split Rooftop Unit Installation Manual
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.
Model No. ARNU363DDB4 ARNU483DDB4 ARNU603DDB4 ARNU723DDB4
Cooling Mode Performance
Capacity (Btu/h) 36,000 48,000 60,000 72,000
Maximum Power Input1(W) 640 700 760 770
L / M / H Power Input at Factory Default (W) 110 / 130 / 150 120 / 150 / 260 130 / 250 / 330 140 / 260 / 350
Heating Mode Performance
Capacity (Btu/h) 38,000 52,000 71,000 80,000
Maximum Power Input1(W) 640 700 760 770
L / M / H Power Input at Factory Default (W) 110 / 130 / 150 120 / 150 / 260 130 / 250 / 330 140 / 260 / 350
Entering Mixed Air
Cooling Maximum (°F WB) 76 76 76 76
Heating Minimum (°F DB)259 59 59 59
Unit Data
Refrigerant Type3R410A R410A R410A R410A
Refrigerant Control EEV EEV EEV EEV
Sound Power4dB(A) (H / M / L) 66 / 63 / 60 67 / 64 / 61 68 / 65 / 62 69 / 66 / 63
Net Unit Weight (lbs.) 461 461 461 461
Shipping Weight (lbs.) 483 483 483 483
Communication Cable5(No. x AWG) 2 x 18
Fan
Type 3D Plug
Motor 1 1 1 1
Motor / Drive ECM (Electronically Commutated Motor) / Direct
Airflow Rate H/M/L (CFM) Standard Mode 1200 / 1000 / 800 1400 / 1200 / 950 1700 / 1300 / 1000 1800 / 1400 / 1100
External Static Pressure (in. wg) Standard Mode 1.7 1.6 1.5 1.4
External Static Pressure (in. wg) 0.2 - 1.7 0.2 - 1.6 0.2 - 1.5 0.2 - 1.4
Piping
Liquid Line (in., O.D.) 3/8 Brazed 3/8 Brazed 3/8 Brazed 3/8 Brazed
Vapor Line (in., O.D.) 5/8 Brazed 5/8 Brazed 3/4 Brazed 3/4 Brazed
Condensate Line (in., I.D.) 1, Plain
Filtration
Outdoor 2” Merv8 (16” x 20”) x 4 each
Table 2: ARNU363~ 723DDB4 General Data.
EEV: Electronic Expansion Valve
Power wiring is eld supplied and must comply with the applicable local and national
codes.
This unit comes with a dry nitrogen charge.
Rated capacity is certied under AHRI Standard 1230. Ratings are subject to change
without notice. Current certied ratings are available at www.ahridirectory.org.
1Max power input is rated at maximum setting value.
2Low ambient performance with LGRED° heat technology is included in Multi V 5 Air
Source Units produced after February 2019.
3Take appropriate actions at the end of HVAC equipment life to recover, recycle, reclaim or
destroy R410A refrigerant according to applicable regulations (40 CFR Part 82, Subpart F)
under section 608 of CAA.
4Sound Pressure levels are tested in an anechoic chamber under ISO Standard 3745.
5All communication cable to be minimum 18 AWG, 2-conductor, twisted, stranded, shielded
and must comply with applicable local and national codes. Ensure the communication
cable is properly grounded at the main outdoor unit only. Do not ground the ODU-IDU
communication cable at any other point.
General Data
PRODUCT OVERVIEW

13
Product Data
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.
Electrical Data
Table 3: Split Rooftop Unit Electrical Data.
MCA : Minimum Circuit Ampacity.
MOP : Maximum Overcurrent Protection.
Units are suitable for use on an electrical system where voltage supplied to unit terminals is within the listed range limits.
Select wire size based on the larger MCA value.
Instead of fuse, use the circuit breaker.
1Max. power input is rated at maximum setting value.
PRODUCT OVERVIEW
Capacity
(RT)
Voltage
Range MCA MOP Rated Amps (A)
Power Supply Power Input1(W)
Hz Volts Phase Max.
Cooling
Max.
Heating
L / M / H at Factory
Default
6
208 / 230
8.4
15
6.7
60 208 / 230 1
770 770 140 / 260 / 350
5 8.4 6.7 760 760 130 / 250 / 330
48.4 6.7 700 700 120 / 150 / 260
3 8.4 6.7 640 640 110 / 130 / 150

14
MULTI V Split Rooftop Unit Installation Manual
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.
Interior Components
PRODUCT OVERVIEW
Figure 2: RTU Components Heat Recovery Model.
Heat Exchanger
Heat Recovery Unit
Supply Fan
Supply Outlet
(Bottom)
Filter (MERV 8 / 13)
Economizer
(Optional)
Return Inlet
(Bottom)
Return Inlet
(Side)
Supply Outlet
(Side)
Heat Recovery Model

15
Product Data
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.
Interior Components
PRODUCT OVERVIEW
Heat Pump Model
Figure 3: RTU Components Heat Pump Model.

16
MULTI V Split Rooftop Unit Installation Manual
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.
PRODUCT OVERVIEW
Control Box Components
Main PCB
SUB PCB(HR UNIT)
SUB PCB(Main PCB)
Transformer
208-230V →24V
T/B-Economizer
T/B-Motor
T/B-Communication/ Remote
T/B-Main Power
Economizer(Honey Well)
T/B-DO (Digital Output)
Relay PCB
Dry Contact
208-230V →24V
HR UNIT PCB
Figure 4: Control box in the Split Rooftop Unit.

17
Product Data
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.
External Dimensions
Figure 5: Split RTU Dimensions.
PRODUCT OVERVIEW

18
MULTI V Split Rooftop Unit Installation Manual
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.
Refrigerant Flow Diagram
Figure 6: ARNU363~723DDA4 Refrigerant Flow Diagram.
PRODUCT OVERVIEW

19
Product Data
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.
Refrigerant Flow Diagram
Figure 7: ARNU363~723DDA4 Refrigerant Flow Diagram.
Table 4: ARNU363~723DDA4 Refrigerant Pipe Connection Port Diameters.
Model Liquid (inch) High Pressure Vapor (inch) Low Pressure Vapor (inch)
ARNU723DDA4
3/8 Brazed
5/8 Brazed 3/4 Brazed
ARNU603DDA4
ARNU483DDA4 1/2 Brazed 5/8 Brazed
ARNU363DDA4
Thermistor Description
TH1 Return air thermistor
TH2 HR Pipe out thermistor
TH3 HR Pipe in thermistor
TH4 HR liquid
TH5 Pipe in thermistor
TH6 Pipe out thermistor
Table 5: ARNU363~723DDA4 Thermistors.
PRODUCT OVERVIEW

20
MULTI V Split Rooftop Unit Installation Manual
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.
Figure 8: ARNU363~723DDB4 Refrigerant Flow Diagram.
Table 6: ARNU363~723DDB4 Refrigerant Pipe Connection Port Diameters.
Model Liquid (inch) Refrigerant Vapor (inch) Condensate Line (inch)
ARNU723DDB4
3/8 Brazed
3/4 Brazed
1, plain
ARNU603DDB4
ARNU483DDB4 5/8 Brazed
ARNU363DDB4
Thermistor Description
TH1 Return air thermistor
TH2 Pipe in thermistor
TH3 Pipe out thermistor
Table 7: ARNU363~723DDB4 Thermistors.
Refrigerant Flow Diagram
PRODUCT OVERVIEW