LG MULTI V ARN Series Installation and operation manual

EM_MultiV_FloorSuspendConvert_IndoorUnits_8_17
FLOOR STANDING, CEILING SUSPENDED,
AND
CONVERTIBLE SURFACE MOUNTED
INDOOR UNIT
ENGINEERING MANUAL
Floor Standing
7,500 to 24,200 Btu/h
Convertible Surface Mounted
9,600 and 12,300 Btu/h
Ceiling Suspended
19,100 and 24,200 Btu/h
Cased Uncased

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
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.
This document is for design purposes only.
A summary list of safety precautions is on page 3.
For more technical materials such as submittals, catalogs, installation,
owner’s, and service manuals, visit www.lghvac.com.

INTRODUCTION |3
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.
TABLE OF CONTENTS
Unit Nomenclature................................................................................. 4
LATS Overview ................................................................................... 5-6
Floor Standing Indoor Units............................................................ 7-28
Mechanical Specications ................................................................ 8-9
General Data ................................................................................ 10-11
Electrical Data ................................................................................... 12
External Dimensions..................................................................... 13-14
Electrical Wiring Diagrams ........................................................... 15-16
Refrigerant Flow Diagrams................................................................ 17
Acoustic Data ............................................................................... 19-21
Air Velocity / Temperature Distribution.......................................... 22-24
Capacity Tables ............................................................................ 25-28
Ceiling Suspended Indoor Units................................................... 29-40
Mechanical Specications ................................................................. 30
General Data ..................................................................................... 31
Electrical Data ................................................................................... 31
External Dimensions.......................................................................... 32
Electrical Wiring Diagram ............................................................. 33-34
Refrigerant Flow Diagram.................................................................. 35
Acoustic Data .................................................................................... 36
Air Velocity / Temperature Distribution............................................... 37
Capacity Tables ............................................................................ 38-40
Convertible Surface Mounted Indoor Units ................................. 41-52
Mechanical Specications ................................................................. 42
General Data ..................................................................................... 43
Electrical Data ................................................................................... 43
External Dimensions.......................................................................... 44
Electrical Wiring Diagram .................................................................. 45
Refrigerant Flow Diagram.................................................................. 47
Acoustic Data .................................................................................... 48
Air Velocity / Temperature Distribution.......................................... 49-50
Capacity Tables ............................................................................ 51-52
Application Guidelines................................................................... 53-60
Selecting the Best Location.......................................................... 54-55
General Mounting......................................................................... 55-57
General Drain Piping Information ................................................. 57-58
Wiring Guidelines ......................................................................... 59-60
Wired Remote Controller Location .................................................... 60
Acronyms............................................................................................. 61
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.
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 should not be completed.
DANGER
CAUTION

4|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.
MULTI V Floor, Suspended, Convertible Indoor Unit Engineering Manual
UNIT NOMENCLATURE
ARN U07 3TN C
Generation
2 = Second
4 = Fourth
A = Second, Revision A
Electrical Ratings
3 = 208–230V/60Hz/1Ph
05 = 5,000 Btu/h
07 = 7,000 Btu/h
09 = 9,000 Btu/h
12 = 12,000 Btu/h
15 = 15,000 Btu/h
18 = 18,000 Btu/h
24 = 24,000 Btu/h
28 = 28,000 Btu/h
30 = 30,000 Btu/h
36 = 36,000 Btu/h
42 = 42,000 Btu/h
48 = 48,000 Btu/h
54 = 54,000 Btu/h
76 = 76,000 Btu/h
96 = 96,000 Btu/h
Type
U = DC Inverter Heat Pump
Family
ARN = Multi V Indoor Unit
(Refrigerant R410A)
B3 = Ducted (low static - bottom return)
B4 = Ducted (low static - bottom return)
B8 = Ducted (high static)
BG = Ducted (high static)
BR = Ducted (high static)
CE = Floor Standing (small frame)
CF = Floor Standing (large frame)
L1 = Ducted (low static)
L2 = Ducted (low static)
L3 = Ducted (low static)
NJ = Vertical/Horizontal Air Handling Unit
NK = Vertical/Horizontal Air Handling Unit
SB = Wall Mounted
SC = Wall Mounted
TT = 1-Way Ceiling Cassette
TU = 1-Way Ceiling Cassette
TL = 2-Way Ceiling Cassette
TM = 4-Way Ceiling Cassette
TN = 4-Way Ceiling Cassette
TP = 4-Way Ceiling Cassette
TQ = 4-Way Ceiling Cassette
TR = 4-Way Ceiling Cassette
VE = Convertible Surface Mounted
VJ = Ceiling Suspended
Feature
A, C, L, R = Standard*
G = Low Static
U = Uncased
Indoor Unit Nominal Capacity
Model
4
*Plasma lter kit accessories are available separately. Always follow all local, state, and national building codes with the use of
this or any product.

INTRODUCTION |5
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.
LG Air Conditioner Technical Solution (LATS) Software
A properly designed and installed refrigerant piping system is critical to the optimal performance of LG air-conditioning systems. To assist
engineers, LG offers, free of charge, LG Air Conditioner Technical Solution (LATS) software—a total design solution for LG air conditioning
systems.
To reduce the risk of designing an improper applied system or one that will not operate correctly, LG requires that LATS software be used on all
projects.
Formats
LATS is available to LG customers in three user interfaces: LATS HVAC, LATS CAD2, and LATS REVIT. All three LATS formats are available
through www.myLGHVAC.com, or contact an LG Sales Representative.
LATS HVAC is a Windows®-based application that aids engineers in designing LG Variable Refrigerant Flow (VRF), Multi F / Multi F MAX,
Single-Zone, and Energy Recovery Ventilator (ERV) systems.
*Windows® is a registered mark of Microsoft® Corporation.
LATS CAD2 combines the LG LATS program with AutoCAD®
software**. It permits engineers to layout and validate LG Multi V
Variable Refrigerant Flow (VRF), Multi F / Multi F MAX, Single-Zone,
and Energy Recovery Ventilator (ERV) systems directly into CAD
drawings.
LATS Revit integrates the LG LATS program with Revit®software**.
It permits engineers to layout and validate Multi V VRF systems
directly into Revit drawings.
**AutoCAD® and Revit® are both registered marks of Autodesk, Inc.
Features
All LG product design criteria have been loaded into the program,
making LATS simple to use: double click or drag and drop the com-
ponent choices. Build systems in Tree Mode where the refrigerant
system can be viewed. Switch to a Schematic diagram to see the electrical and communications wiring.
LATS software permits the user to input region data, indoor and outdoor design temperatures, modify humidity default values, zoning, specify
type and size of outdoor units and indoor units, and input air flow and external static pressure (ESP) for ducted indoor units.
The program can also:
LG AIR CONDITIONER
TECHNICAL SOLUTION (LATS)
•Import building loads from a separate Excel file.
•Present options for outdoor unit auto selection.
•Automatically calculate component capacity based on design
conditions for the chosen region.
•Verify if the height differences between the various system
components are within system limits.
•Provide the correct size of each refrigerant piping segment and LG
Y-Branches and Headers.
•Adjust overall piping system length when elbows are added.
•Check for component piping limitations and flag if any parameters
are broken.
•Factor operation and capacity for defrost operation.
•Calculate refrigerant charge, noting any additional trim charge.
•Suggest accessories for indoor units and outdoor units.
•Run system simulation.
Features depend on which LATS program is being used, and the type of system being designed.
Figure 1: Example of LATS CAD2.

6|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.
MULTI V Floor, Suspended, Convertible Indoor Unit Engineering Manual
LATS Generates a Complete Project Report
LATS software also generates a report containing project design parameters, cooling and heating design data, system component perfor-
mance, and capacity data. The report includes system combination ratio and refrigerant charge calculations; and provides detailed bill of
material, including outdoor units, indoor units, control devices, accessories, refrigerant pipe sizes segregated by building, by system, by pipe
size, and by pipe segments. LATS can generate an Excel GERP report that can imported into the LG SOPS pricing and ordering system.
Proper Design to Install Procedure
LG encourages a two report design-to-install-procedure. After the
design engineer determines building / zone loads and other details,
the engineer opens the LATS program and inputs the project’s infor-
mation. When the design is complete, the “Auto Piping” and “System
Check” functions should be used to verify piping sizes, limitations,
and if any design errors are present. If errors are found, engineers
should adjust the design, and run Auto Piping and System Check
again. When the design passes the checks, then the engineer prints
out a project “Shop Drawing” (LATS Tree Diagram) and provides it to
the installing contractor. The contractor should follow the LATS Tree
Diagram when building the piping system, but oftentimes the design
changes on the building site:
•Architect has changed location and/or purpose of room(s).
•Outdoor unit cannot be placed where originally intended.
•Structural elements prevent routing the piping as planned.
•Air conditioning system conflicts with other building systems
(plumbing, gas lines, etc.).
The contractor must mark any deviation from the design on the Shop Drawing, including as-built straight lines and elbows. This “Mark Up”
drawing should be returned to the design engineer or Rep, who should input contractor changes into the LATS file. (Copy the original LATS
software file, save and rename as a separate file, and modify all piping lengths by double-clicking on each length and editing information.)
Like the shop drawing, the Auto Piping and System Check should also be run on this new “As Built” drawing. The design engineer or Rep
must then provide the final As Built file to the contractor. The Mark Up version must be compared to the As Built version for:
•Differences in pipe diameter(s). If incorrect diameters have been installed, the piping must be changed out. If pipe diameters have changed,
check to see if Y-Branches will also need to be changed.
•Changes to outdoor unit and indoor unit capacities. Capacities changes may impact line length changes.
•Additional refrigerant charge quantity (“Trim Charge”). Trim charge will change if piping lengths and diameters change. The As Built version
must reflect installed piping lengths to ensure correct trim charge.
All documents submitted by the contractor, as well as the Shop Drawing and the As Built Drawing files must be provided for commissioning
purposes. Model and serial numbers for all system components must also be submitted. If the steps previously detailed are not followed,
and all documents are not provided to the commissioning agent, the project runs the risk of not being commissioned and voiding any limited
warranty LG offers on the equipment.
LG AIR CONDITIONER
TECHNICAL SOLUTION (LATS)
Figure 2: Example of a LATS Tree Diagram.

FLOOR STANDING
Cased
Uncased
Mechanical Specifications on page 8
General Data on page 10
Electrical Data on page 12
External Dimensions on page 13
Electrical Wiring Diagram on page 15
Refrigerant Flow Diagrams on page 17
External Static Pressure and Air Flow on
page 18
Acoustic Data on page 19
Air Velocity / Temperature Distribution
on page 22
Capacity Tables on page 25

8|FLOOR STANDING
MULTI V Floor, Suspended, Convertible Indoor Unit Engineering 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.
FLOOR STANDING
Mechanical Specications
Casing
Cased
The case is designed to be free standing on the floor against a
vertical surface. The backplane of the unit allows secure attachment
of the unit to a vertical surface. Supply air is vertical from the top of
the unit with a bottom front return through a toe slot at floor level.
The supply air opening is covered with an architectural grille. The
unit is manufactured using coated metal with an off-white ABS
architectural polymeric resin exterior case. Cold surfaces are
covered with a coated polystyrene insulating material. Flip open
controller access doors cover the controller mounting bays located
on both ends of the top panel. A polymeric resin coated metal safety
grille is provided behind the removable filters located in the toe
space to prevent reach access to the fan wheel.
Uncased
The unit case is designed to be concealed in a field-provided
architectural enclosure. The unit case is manufactured using coated
metal. Cold surfaces are covered with a coated polystyrene insu-
lating material. The back plane of the unit has two side mounting
flanges with bolt holes for hanging the unit on a vertical wall near the
floor. Airflow is vertical from the bottom to the top. A polymeric resin
coated metal safety grille is provided behind the removable filters
located at the return air opening to prevent reach access to the fan
wheels.
Fan Assembly and Control
7–15 MBh
The unit has three Sirocco fans mounted on a common shaft and
made of high strength ABS HT-700 polymeric resin. The fan shaft is
directly driven by a single digitally-controlled inverter fan motor.
18–24 MBh
The unit has two independent fan assemblies consisting of two mo-
tors and four fans. Each assembly consists of two Sirocco fans made
of high strength ABS HT-700 polymeric resin. Each pair of fans are
mounted on a common shaft and driven directly by a single digitally
controlled inverter motor.
Fan Motors
The fan motors are a Brushless Digitally Controlled (BLDC) design
with permanently lubricated and sealed ball bearings. The fan motor
includes thermal, overcurrent and low RPM protection. The fan/motor
assembly is mounted in vibration attenuating rubber grommets. The
fan impeller is statically and dynamically balanced. The fan speed is
controlled using a microprocessor-based direct digital control algo-
rithm that provides a high fan speed in cooling thermal ON and low
fan speed in cooling thermal OFF, high fan speed in heating thermal
ON and fan off in heating thermal OFF. The fan speeds can be field
adjusted between low, medium, and high speeds. The fan speed
algorithm provides a field-selectable fixed or auto-speed setting that
adjusts fan speed to simulate natural airflow.
Air Filter
Return air is filtered using two (2) removable, washable filters with
anti-fungal treatment on the 7-15 MBh models and three (3) remov-
able, washable filters with anti-fungal treatment on the 18-24 MBh
models. Access to the filter media is from the return air toe slot
located on the front of the unit without removing unit panels.
Microprocessor Control
The unit is provided with an integrated microprocessor-based
controller. A temperature thermistor is factory-mounted in the return
air stream. The controller is capable of performing functions
necessary to operate the system without the use of a separate unit
or wall-mounted controller. All unit operation parameters, excluding
the operation schedule, are stored in non-volatile memory resident
on the unit microprocessor. Operating schedules are stored in select
models of the optional unit or wall-mounted, local or central
controller. The field-supplied communication cable between the
indoor unit(s) and outdoor unit is to be a minimum of 18 AWG, 2
conductor, stranded, and shielded cable (RS-485), terminated via
screw terminals on the control boards. The microprocessor control
provides the following functions: auto addressing, self-diagnostics,
auto restart following power restoration, test run, and will operate the
indoor unit using one of five operating modes:
1. Auto Changeover (Heat Recovery only)
2. Heating
3. Cooling
4. Dry
5. Fan Only
For Heat Recovery systems the Auto Changeover setting automat-
ically switches between cooling and heating modes based on room
temperature conditions.
For Heat Pump systems, heated or cooled air delivery is dependent
upon outdoor unit operating mode.
In Heating mode, the microprocessor control will activate the indoor
unit when indoor room temperature falls below set-point temperature
and signals the outdoor unit to begin the heating cycle. The indoor
unit fan operation is delayed until coil pipe temperature reaches
76ºF. Significant airflow is generated when pipe temperature reaches
80°F. In lieu of factory return air thermistor, screw terminals on the
microprocessor circuit board accommodate various models of wall
Cased Uncased

FLOOR STANDING | 9
Floor Standing
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.
FLOOR STANDING
Mechanical Specications
Controls Features
•Auto changeover (Heat Recovery only)
•Auto operation
•Auto restart
•External on/off control
•Dual thermistor control
•Dual set-point control*
•Filter life and power consumption display*
•Multiple auxiliary heater applications*
•Fan speed control
•Group control
•Hot start
•Self diagnostics
•Timer (on / off)
•Weekly schedule
or unit-mounted local controllers and/or a wall-mounted remote
temperature sensor. The unit microprocessor is capable of accepting
space temperature readings concurrently or individually from either:
1. Wall or unit mounted wired controller(s)
2. Factory mounted return air thermistor or the optional wall-
mounted wired remote temperature sensor
The microprocessor controls space temperature using the value pro-
vided by the temperature sensor sensing a space temperature that
is farthest away from the temperature set-point. The microprocessor
control provides a cooling or heating mode test cycle that operates
the unit for 18 minutes without regard to the space temperature. If
the system is provided with an optional local or central controller,
displayed diagnostic codes are specific, alpha numeric, and provide
the service technician with the reason for the code displayed.
Handling Condensate
The unit is designed to provide gravity draining of condensate. LG
provides a factory insulated flexible drain hose. If condensate lifts/
pumps are needed for the application, they are to be field-provided.
Condensate float safety switch connections are available on the
main control board for connection of a field supplied float safety
switch.
Condensate Drain Pan
The condensate drain pan is constructed of expandable polystyrene
resin (EPS).
Coil
The indoor unit coil is constructed with grooved design copper tubes
with slit coil fins, two (2) rows, nineteen (19) fins per inch.
*To enable Generation 4 features, outdoor unit DIP Switch No. 3 must
be set to ON. Please refer to the Multi V IV, Multi V Water IV , Multi V S
Engineering Manual for additional information.

10 |FLOOR STANDING
MULTI V Floor, Suspended, Convertible Indoor Unit Engineering 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.
FLOOR STANDING
General Data
Model No. ARNU073CEA4 ARNU093CEA4 ARNU123CEA4 ARNU153CEA4 ARNU183CFA4 ARNU243CFA4
Cooling Mode Performance
Capacity (Btu/h) 7,500 9,600 12,300 15,400 19,100 24,200
Power Input1(W) 85 85 85 85 115 115
Heating Mode Performance
Capacity (Btu/h) 8,500 10,900 13,600 17,100 21,500 27,300
Power Input1(W) 85 85 85 85 115 115
Entering Mixed Air
Cooling Max. (°F WB) 76 76 76 76 76 76
Heating Min. (°F DB) 59 59 59 59 59 59
Unit Data
Refrigerant Type2R410A R410A R410A R410A R410A R410A
Refrigerant Control EEV EEV EEV EEV EEV EEV
Sound Pressure3dB(A) (H/M/L) 35 / 33 / 31 36 / 34 / 32 37 / 35 / 33 38 / 37 / 35 40 / 37 / 34 43 / 40 / 37
Net Unit Weight (lbs.) 59.5 59.5 59.5 59.5 75.0 75.0
Shipping Weight (lbs.) 68.3 68.3 68.3 68.3 86.0 86.0
Communication Cable4(No. x AWG) 2 x 18 2 x 18 2 x 18 2 x 18 2 x 18 2 x 18
Fan
Type Sirocco Sirocco Sirocco Sirocco Sirocco Sirocco
Motor 2 2 2 2 2 2
Housing 3 3 3 3 4 4
Motor/Drive Brushless Digitally Controlled / Direct
Airflow Rate H/M/L (CFM)
High Mode (Factory Set) 300 / 265 / 229 335 / 300 / 265 371 / 335 / 300 406 / 353 / 335 565 / 494 / 424 635 / 565 / 494
External Static Pressure (in. wg)
High Mode (Factory Set) 0 0 0 0 0 0
Piping
Liquid Line (in., O.D.) 1/4 Flare 1/4 Flare 1/4 Flare 1/4 Flare 1/4 Flare 3/8 Flare
Vapor Line (in., O.D.) 1/2 Flare 1/2 Flare 1/2 Flare 1/2 Flare 1/2 Flare 5/8 Flare
Condensate Line (in., I.D.) 1 1 1 1 1 1
Table 1: Cased Floor Standing (CEA, CFA) Indoor Unit General Data.
EEV: Electronic Expansion Valve
Power wiring is field supplied and must comply with the applicable local and national codes.
This unit comes with a dry nitrogen charge.
This data is rated 0 ft above sea level, with 25 ft of refrigerant line per indoor unit and a 0 ft level
difference between outdoor and indoor units. All capacities are net with a combination ratio between
95-105%.
Cooling capacity rating obtained with air entering the indoor coil at 80ºF dry bulb (DB) and 67ºF wet
bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB).
Heating capacity rating obtained with air entering the indoor unit at 70ºF dry bulb (DB) and outdoor
ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB).
1Power Input is rated at high speed.
2Take 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.
3Sound Pressure levels are tested in an anechoic chamber under ISO Standard 3745.
4All 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 master outdoor unit only. Do not ground the ODU-IDU communication cable at any other point.
CEA, CFA Cased Units

FLOOR STANDING | 11
Floor Standing
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.
Model No. ARNU073CEU4 ARNU093CEU4 ARNU123CEU4 ARNU153CEU4 ARNU183CFU4 ARNU243CFU4
Cooling Mode Performance
Capacity (Btu/h) 7,500 9,600 12,300 15,400 19,100 24,200
Power Input1(W) 85 85 85 85 115 115
Heating Mode Performance
Capacity (Btu/h) 8,500 10,900 13,600 17,100 21,500 27,300
Power Input1(W) 85 85 85 85 115 115
Entering Mixed Air
Cooling Max. (°F WB) 76 76 76 76 76 76
Heating Min. (°F DB) 59 59 59 59 59 59
Unit Data
Refrigerant Type2R410A R410A R410A R410A R410A R410A
Refrigerant Control EEV EEV EEV EEV EEV EEV
Sound Pressure3dB(A) (H/M/L) 35 / 33 / 31 36 / 34 / 32 37 / 35 / 33 38 / 37 / 35 40 / 37 / 34 43 / 40 / 37
Net Unit Weight (lbs.) 46.3 46.3 46.3 46.3 58.4 58.4
Shipping Weight (lbs.) 56.2 56.2 56.2 56.2 68.3 68.3
Communication Cable4(No. x AWG) 2 x 18 2 x 18 2 x 18 2 x 18 2 x 18 2 x 18
Fan
Type Sirocco Sirocco Sirocco Sirocco Sirocco Sirocco
Motor 2 2 2 2 2 2
Housing 3 3 3 3 4 4
Motor/Drive Brushless Digitally Controlled / Direct
Airflow Rate H/M/L (CFM)
High Mode (Factory Set) 300 / 265 / 229 335 / 300 / 265 371 / 335 / 300 406 / 353 / 335 565 / 494 / 424 635 / 565 / 494
External Static Pressure (in. wg)
High Mode (Factory Set) 0 0 0 0 0 0
Piping
Liquid Line (in., O.D.) 1/4 Flare 1/4 Flare 1/4 Flare 1/4 Flare 1/4 Flare 3/8 Flare
Vapor Line (in., O.D.) 1/2 Flare 1/2 Flare 1/2 Flare 1/2 Flare 1/2 Flare 5/8 Flare
Condensate Line (in., I.D.) 1 1 1 1 1 1
Table 2: Uncased Floor Standing (CEU, CFU) Indoor Unit General Data.
EEV: Electronic Expansion Valve
Power wiring is field supplied and must comply with the applicable local and national codes.
This unit comes with a dry nitrogen charge.
This data is rated 0 ft above sea level, with 25 ft of refrigerant line per indoor unit and a 0 ft level
difference between outdoor and indoor units. All capacities are net with a combination ratio between
95-105%.
Cooling capacity rating obtained with air entering the indoor coil at 80ºF dry bulb (DB) and 67ºF wet
bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB).
Heating capacity rating obtained with air entering the indoor unit at 70ºF dry bulb (DB) and outdoor
ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB).
1Power Input is rated at high speed.
2Take 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.
3Sound Pressure levels are tested in an anechoic chamber under ISO Standard 3745.
4All 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 master outdoor unit only. Do not ground the ODU-IDU communication cable at any other point.
FLOOR STANDING
General Data
CEU, CFU Uncased Units

12 |FLOOR STANDING
MULTI V Floor, Suspended, Convertible Indoor Unit Engineering 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.
FLOOR STANDING
Electrical Data
Table 3: Floor Standing (CEA, CFA [Cased]; CEU, CFU [Uncased]) Indoor Unit Electrical Data.
Model Voltage Range MCA MOP Rated Amps (A) Power Supply Power Input (W)
Hz Volts Phase Cooling Heating
CEA / CFA (Cased) Units
ARNU073CEA4
208-230
1.0
15
0.76
60 208-230 1
85 85
ARNU093CEA4 1.0 0.76 85 85
ARNU123CEA4 1.0 0.76 85 85
ARNU153CEA4 1.0 0.76 85 85
ARNU183CFA4 1.2 15 0.97 115 115
ARNU243CFA4 1.2 0.97 115 115
CEU / CFU (Uncased) Units
ARNU073CEU4
208-230
1.0
15
0.76
60 208-230 1
85 85
ARNU093CEU4 1.0 0.76 85 85
ARNU123CEU4 1.0 0.76 85 85
ARNU153CEU4 1.0 0.76 85 85
ARNU183CFU4 1.2 15 0.97 115 115
ARNU243CFU4 1.2 0.97 115 115
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.

FLOOR STANDING | 13
Floor Standing
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.
FLOOR STANDING
External Dimensions
Figure 3: ARNU073~153CEA4, ARNU073~153CEU4 Dimensions.
CEA Cased, CEU Uncased Units
With Case
42
42
5-13/16 5-13/16
15/16
2-3/4 25
8
Air Supply
Air Return
Unit: inches
Note: All measurements
have a tolerance of ±1/4 in.
Without Case
38-1/2
31-5/16
25-3/16
1/2
3/4
2-1/2
7-15/16
6-5/16 1/2
WModel
ARNU073CEA4
ARNU093CEA4
ARNU123CEA4
ARNU153CEA4
H
42 25 8
ARNU073CEU4
ARNU093CEU4
ARNU123CEU4
ARNU153CEU4
38-1/2 25-3/16 7-15/16
D

14 |FLOOR STANDING
MULTI V Floor, Suspended, Convertible Indoor Unit Engineering 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.
FLOOR STANDING
External Dimensions
CFA Cased, CFU Uncased Units
Figure 4: ARNU183-243CFA4, ARNU183-243CFU4 Dimensions.
8
52-15/16
25
2-3/4
5-13/16
41-1/4
1-15/16
5-13/16
7-1/2
6-5/16
49-7/16
43-1/4
42-3/16
4-5/16
1-3/16
3-3/16
5-11/16
2-3/4
13/16
25-5/32
8
With Case
Unit: inches
Note: All measurements
have a tolerance
of ±1/4 in.
Without Case
Air Supply
Air Return
1/2
W
Model
ARNU183CFA4
ARNU243CFA4
H
52-15/16 25 8
ARNU183CFU4
ARNU243CFU4 49-7/16 25-3/16 7-1/2
D

FLOOR STANDING | 15
Floor Standing
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.
FLOOR STANDING
Electrical Wiring Diagram
CEA and CFA Cased, CEU and CFU Uncased Units
Figure 5: ARNU073~153CEA4, ARNU183-243CFA4, ARNU073~153CEU4, ARNU183-243CFU4 Wiring Diagram.

16 |FLOOR STANDING
MULTI V Floor, Suspended, Convertible Indoor Unit Engineering 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 4: CEA and CFA Cased, CEU and CFU Uncased Indoor Unit Wiring Diagram Legend.
Table 5: CEA and CFA Cased, CEU and CFU Uncased Indoor Unit DIP Switch Settings.
FLOOR STANDING
Electrical Wiring Diagram
CEA and CFA Cased, CEU and CFU Uncased Units
*For Gen 4 Multi V oor standing indoor units, DIP switches 1, 2, 6 through 8 must be set to OFF. These DIP switches are
used for other models.
**To enable Generation 4 features, outdoor unit DIP Switch No. 3 must be set to ON. Please refer to the Multi V IV, Multi V Wa-
ter IV, Multi V S Engineering Manual for additional information.
DIP Switch Setting Off On Remarks
SW3 GROUP CONTROL Master Slave Group control setting using 7-Day Programmable Controller; selects Master /
Slave on each indoor unit
SW4 DRY CONTACT
MODE Variable Auto
Sets operation mode for optional Dry Contact accessory
1. Variable: Auto or Manual Mode can be set through 7-Day Programmable
Controller or Wireless Remote Controller (factory default setting is Auto if
there is no setting)
2. Auto: For Dry Contact, it is always Auto mode
SW5 CONTINUOUS FAN Off On
Selects continuous fan for floor standing indoor units.
1. On: Indoor unit fan will always operate at a set fan speed, except when
the system is off, or the outdoor unit is in defrost mode (when the oudoor unit
is in defrost mode, the fan will operate at super low fan speed)
2. Off: Indoor unit fan speed can be changed by on / off
Terminal Purpose Function
CN-POWER AC Power supply AC Power line
CN-MOTOR1 Fan motor output Motor output of BLDC
CN-MOTOR2 Fan motor output Motor output of BLDC
CN-DAMPER N / A N / A
CN-ZONE Zone controller Zone controller connection
CN-EXT External on / off controller External on / off Controller connection
CN-EEV EEV Output EEV control output
CN-OPTION Optional PCB EPROM Option PCB connection
CN-DISPLAY Display Display of indoor status
CN-PTC Auxiliary heater Connection for Auxiliary Heater
CN-CC Dry contact Dry Contact connection
CN-AIRC N / A N / A
CN-LEAK Refrigerant leak detector Refrigerant leak detector connection
CN-WF N / A N / A
CN-HUMID N / A N / A
CN-FLOAT Float switch input Float switch sensing
CN-PIPE/OUT Discharge pipe sensor Pipe out thermistor
CN-PIPE/IN Suction pipe sensor Pipe in thermistor
CN-ROOM Room sensor Room air thermistor
CN-REMO Wired remote controller Wired remote control connection
CN-D/PUMP Drain pump output AC output for drain pump
CN-485 Communication Connection between indoor and outdoor units

FLOOR STANDING | 17
Floor Standing
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.
FLOOR STANDING
Refrigerant Flow Diagram
Figure 6: CEA and CFA Cased, CEU and CFU Uncased Indoor Unit Refrigerant Flow Diagram.
Table 6: CEA and CFA Cased, CEU and CFU Uncased Indoor Unit Refrigerant Pipe Connection Port Diameters.
Thermistor Description
TH1 Return air thermistor
TH2 Pipe in thermistor
TH3 Pipe out thermistor
Table 7: CEA and CFA Cased, CEU and CFU Uncased Indoor Unit Thermistors.
CEA and CFA Cased, CEU and CFU Uncased Units
Heat Exchanger
Sirocco Fan
TH3
TH1
TH2
lndoor unit
EEV Heating
Cooling
Filter
Filter
Model Liquid (inch) Vapor (inch)
CEA / CFA (Cased) Units
ARNU073CEA4
1/4 Flare 1/2 Flare
ARNU093CEA4
ARNU123CEA4
ARNU153CEA4
ARNU183CFA4
ARNU243CFA4 3/8 Flare 5/8 Flare
CEU / CFU (Uncased) Units
ARNU073CEU4
1/4 Flare 1/2 Flare
ARNU093CEU4
ARNU123CEU4
ARNU153CEU4
ARNU183CFU4
ARNU243CFU4 3/8 Flare 5/8 Flare

18 |FLOOR STANDING
MULTI V Floor, Suspended, Convertible Indoor Unit Engineering 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.
FLOOR STANDING
External Static Pressure and Air Flow Tables
CEU, CFU Uncased Units
Table 8: CEU Uncased Unit External Static Pressure and Air Flow Table.
Table 9: CFU Uncased Unit External Static Pressure and Air Flow Table.
Set Value Static Pressure (in. wg)
0 0.04 0.08 0.12 0.16 0.20 0.24
65 197 115 25 - - - -
70 219 138 26 - - - -
75 235 183 52 - - - -
80 257 209 99 - - - -
85 280 236 155 - - - -
90 294 256 181 - - - -
95 320 267 208 - - - -
100 335 281 245 - - - -
105 358 315 268 - - - -
110 377 337 298 - - - -
115 396 359 323 - - - -
120 418 378 349 - - - -
130 459 420 397 - - - -
1. All static pressure air flow rates are listed in CFM.
2. The tables above show the correlation between air flow rates and external static pressure.
3. The tables above show the available external static pressure range.
If the external static pressure of the installed indoor unit is less than the lowest value (as mentioned in the table), the indoor unit components
can fail.
Set Value Static Pressure (in. wg)
0 0.04 0.08 0.12 0.16 0.20 0.24
65 330 227 - - - - -
70 373 274 - - - - -
75 408 312 83 - - - -
80 440 377 236 - - - -
85 481 411 261 - - - -
90 508 448 376 129 - - -
95 534 481 405 278 89 - -
100 582 525 458 380 241 - -
105 611 565 515 412 250 - -
110 644 595 543 468 382 108 -
115 681 631 584 538 439 243 -
120 709 670 635 574 499 376 92
130 787 743 709 663 602 531 423

FLOOR STANDING | 19
Floor Standing
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.
FLOOR STANDING
Acoustic Data
Sound Pressure Levels
Figure 7: Sound Pressure Measurement Location.
Model Sound Pressure Levels dB(A)
High Fan Speed Medium Fan Speed Low Fan Speed
CEA, CFA (Cased) Units
ARNU073CEA4 35 33 31
ARNU093CEA4 36 34 32
ARNU123CEA4 37 35 33
ARNU153CEA4 38 37 35
ARNU183CFA4 40 37 34
ARNU243CFA4 43 40 37
CEU, CFU (Uncased) Units
ARNU073CEU4 35 33 31
ARNU093CEU4 36 34 32
ARNU123CEU4 37 35 33
ARNU153CEU4 38 37 35
ARNU183CFU4 40 37 34
ARNU243CFU4 43 40 37
Table 10: Floor Standing Sound Indoor Unit Pressure Levels.
Figure 8: ARNU073CEA4 / CEU4, ARNU093CEA4 / CEU4, and ARNU123CEA4 / CEU4 Sound Pressure Level Diagrams.
• Measurements are taken 4.9 ft away from the front of the unit.
• Sound pressure levels are measured in dB(A) with a tolerance of ±3.
• Sound pressure levels are tested in an anechoic chamber under ISO Standard 3745.
Operating Conditions:
• Power source: 220V/60 Hz
• Sound level will vary depending on a range of factors including the construction
(acoustic absorption coefficient) of a particular room in which the unit was installed.
4.9ft
4.9ft
Microphone
ARNU073CEA4 /
ARNU073CEU4
ARNU093CEA4 /
ARNU093CEU4
ARNU123CEA4 /
ARNU123CEU4

20 |FLOOR STANDING
MULTI V Floor, Suspended, Convertible Indoor Unit Engineering 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.
Figure 9: ARNU153CEA4 / CEU4, ARNU183CFA4 / CFU4, and ARNU243CFA4 / CFU4 Sound Pressure Level Diagrams.
FLOOR STANDING
Acoustic Data
Sound Pressure Levels / Sound Power Levels
•Data is valid under diffuse field conditions.
•Data is valid under nominal operating conditions.
•Sound power level is measured using rated conditions, and tested
in a reverberation room per ISO 3741 standards.
• Sound level will vary depending on a range of factors such as
construction (acoustic absorption coefficient) of particular area in
which the equipment is installed.
•Reference acoustic intensity: 0dB = 10E-6μW/m2
Model Sound Power Levels dB(A)
CEA / CFA (Cased) Units
ARNU073CEA4 54
ARNU093CEA4 55
ARNU123CEA4 57
ARNU153CEA4 59
ARNU183CFA4 60
ARNU243CFA4 61
CEU / CFU (Uncased) Units
ARNU073CEU4 54
ARNU093CEU4 55
ARNU123CEU4 57
ARNU153CEU4 59
ARNU183CFU4 60
ARNU243CFU4 61
Table 11: Floor Standing Indoor Unit Sound Power Levels.
Sound Power Levels
ARNU153CEA4 /
ARNU153CEU4
ARNU183CFA4 /
ARNU183CFU4
ARNU243CFA4 /
ARNU243CFU4