LG Multi V ARNU073TUD4 Installation and operation manual

CEILING CASSETTE INDOOR UNIT
ENGINEERING MANUAL
One-Way Ceiling Cassettes
7,500 to 24,200 Btu/h
Two-Way Ceiling Cassettes
19,100 to 24,200 Btu/h
Four-Way Ceiling Cassettes
5,500 to 48,100 Btu/h

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.
To access additional technical documentation such as submittals, outdoor
unit engineering manuals, installation, service, product data performance,
general best practice, and building ventilation manuals, as well as white
papers, catalogs, LATS software programs, and more, log in to
www.lghvac.com.

INTRODUCTION | 3
Introduction
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TABLE OF CONTENTS
Unit Nomenclature................................................................................. 4
LG Air Conditioner Technical Solution (LATS) ................................ 5-6
Refrigerant Charge Worksheet.......................................................... 7-9
One-Way Ceiling Cassette ............................................................. 10-35
0HFKDQLFDO6SHFL¿FDWLRQV ............................................................ 11-12
*HQHUDO'DWD ................................................................................ 13-14
(OHFWULFDO'DWD ................................................................................... 15
([WHUQDO'LPHQVLRQV..................................................................... 16-17
(OHFWULFDO:LULQJ'LDJUDP ............................................................. 18-19
5HIULJHUDQW)ORZ'LDJUDP.................................................................. 20
$FRXVWLF'DWD ............................................................................... 21-24
$LU9HORFLW\7HPSHUDWXUH'LVWULEXWLRQ.......................................... 25-32
2XWVLGH$LU9HQWLODWLRQ ....................................................................... 33
&RROLQJDQG+HDWLQJ&DSDFLW\7DEOHV................................................ 34
$FFHVVRULHV ....................................................................................... 35
Two-Way Ceiling Cassette ............................................................. 36-51
0HFKDQLFDO6SHFL¿FDWLRQV ............................................................ 37-38
*HQHUDO'DWD(OHFWULFDO'DWD........................................................... 39
([WHUQDO'LPHQVLRQV.......................................................................... 40
(OHFWULFDO:LULQJ'LDJUDP ............................................................. 41-42
5HIULJHUDQW)ORZ'LDJUDP.................................................................. 43
$FRXVWLF'DWD ............................................................................... 44-45
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&RROLQJDQG+HDWLQJ&DSDFLW\7DEOHV................................................ 50
2SWLRQDO$FFHVVRULHV ......................................................................... 51
Four-Way Ceiling Cassette ............................................................ 52-95
0HFKDQLFDO6SHFL¿FDWLRQV ............................................................ 53-54
*HQHUDO'DWD ................................................................................ 55-57
(OHFWULFDO'DWD ................................................................................... 58
([WHUQDO'LPHQVLRQV..................................................................... 59-61
(OHFWULFDO:LULQJ'LDJUDPV ........................................................... 62-65
5HIULJHUDQW)ORZ'LDJUDP.................................................................. 66
$FRXVWLF'DWD ............................................................................... 67-74
$LU9HORFLW\7HPSHUDWXUH'LVWULEXWLRQ.......................................... 75-88
2XWVLGH$LU9HQWLODWLRQ .................................................................. 89-90
%UDQFK'XFW2SWLRQV .................................................................... 91-92
&RROLQJ&DSDFLW\7DEOHV .................................................................... 93
+HDWLQJ&DSDFLW\7DEOHV .................................................................... 94
2SWLRQDO$FFHVVRULHV ......................................................................... 95
Application Guidelines................................................................. 96-106
6HOHFWLQJWKH%HVW/RFDWLRQ............................................................... 97
*HQHUDO0RXQWLQJ......................................................................... 98-99
*HQHUDO'UDLQ3LSLQJ,QIRUPDWLRQ ............................................. 100-101
:LULQJ*XLGHOLQHV ..................................................................... 101-105
:LUHG&RQWUROOHU3ODFHPHQW............................................................. 106
Acronyms........................................................................................... 107
TABLE OF SYMBOLS
DANGER
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Note:
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NOTE

4|INTRODUCTION
MULTI V Ceiling Cassette Indoor Unit Engineering Manual
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ARN U07 3TA A
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)
Feature
A, C, D, L, R = Standard
G = Low Static
U = Uncased
H/1Ph
Indoor Unit Nominal Capacity
Model
4
B8 = 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)
M1 = Ducted (mid static)
M2 = Ducted (mid / high static)
M3 = Ducted (mid / high static)
NJ = Vertical/Horizontal Air Handling Unit
NK = Vertical/Horizontal Air Handling Unit
SF = Wall Mounted / Art Cool™ Gallery
SJ = Wall Mounted / Art Cool Mirror
SK = Wall Mounted / Art Cool Mirror
SV = Wall Mounted / Standard
TT = 1-Way Ceiling Cassette
TU = 1-Way Ceiling Cassette
TS = 2-Way Ceiling Cassette
TM = 4-Way Ceiling Cassette
TN = 4-Way Ceiling Cassette
TQ = 4-Way Ceiling Cassette
TR = 4-Way Ceiling Cassette
UNIT NOMENCLATURE

INTRODUCTION | 5
Introduction
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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.
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SURMHFWV
Formats
LATS is available to LG customers in two user interfaces: LATS HVAC and LATS REVIT. Both 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.
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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.
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Features
All LG product design criteria have been loaded into the program, making LATS simple to use: double click or drag and drop the component
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 do the following:
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.
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6|INTRODUCTION
MULTI V Ceiling Cassette Indoor Unit Engineering Manual
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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 must be used to verify piping sizes, limitations, and
if any design errors are present. If errors are found, engineers must
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 must 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 must be returned to the design engineer or Rep, who must input contractor changes into the LATS file. (Copy the original LATS soft-
ware 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 must 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 1: Example of a LATS Tree Diagram.
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INTRODUCTION | 7
Introduction
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REFRIGERANT CHARGE WORKSHEET
Multi V 5 System R410A Refrigerant Charge Calculator (lbs.)
System Tag or ID:
Job Name: __________________________________________
Project Manager: ____________________________________ Date: ______________
Line # Description Chassis I.D. Size Quantity CF (Ref.)1Total (lbs.)
1 Linear feet of 1/4" liquid line tubing2— — 0.015
2 Linear feet of 3/8" liquid line tubing2— — 0.041
3 Linear feet of 1/2" liquid line tubing2— — 0.079
4 Linear feet of 5/8" liquid line tubing2—— 0.116
5 Linear feet of 3/4" liquid line tubing2— — 0.179
6 Linear feet of 7/8" liquid line tubing2— — 0.238
7 Linear feet of 1" liquid line tubing2— — 0.323
8 Standard + Art Cool Mirror SJ, SK 5k to 15k 0.53
9 Standard + Art Cool Mirror SJ, SK 18k to 24k 0.62
10 Standard SV 30k to 36k 1.01
11 Art Cool Gallery SF 9k to 12k 0.22
12 1-Way Cassette TU 7k to 12k 0.44
13 1-Way Cassette TT 18k to 24k 0.64
14 2-Way Cassette TS 18k to 24k 0.75
15 4-Way 2' x 2' Cassette TR 5k to 7k 0.40
16 4-Way 2' x 2' Cassette TR 9k to 12k 0.55
17 4-Way 2' x 2' Cassette TQ 15k to 18k 0.71
18 4-Way 3' x 3' Cassette TA 7k to 48k 1.5
19 Mid Static Ducted M1 7k to 24k 0.57
20 High Static Ducted M2 7k to 24k 0.77
21 High Static Ducted M2 28k to 42k 1.15
22 High Static Ducted M3 28k to 54k 1.35
23 High Static Ducted B8 36k to 96k 2.20
24 Low Static Ducted, Low Static Ducted Bottom Return L1 5k to 9k 0.31
25 Low Static Ducted, Low Static Ducted Bottom Return L2 12k to 18k 0.42
26 Low Static Ducted, Low Static Ducted Bottom Return L3 21k to 24k 0.55
27 Vertical / Horizontal Air Handling Unit NJ 12k to 30k 1.04
28 Vertical / Horizontal Air Handling Unit NJ 36k 1.57
29 Vertical / Horizontal Air Handling Unit NK 42k to 54k 2.00
30 Floor Standing CE (U) 7k to 15k 0.37
31 Floor Standing CF (U) 18k to 24k 0.82
32 HRU: PRHR022A/023A, 032A/033A, 042A/043A — — 1.1
33 HRU: PRHR063A, 083A — — 2.2
34 ADDITIONAL Refrigerant Charge Required (Sum of lines 1 – 33)
35 Outdoor Unit Factory Refrigerant Charge
35A ARUM072*TE5 72k 14.3
35B ARUM096*TE5 96k 23.2
35C ARUM121*TE5 121k 23.2
35D ARUM144*TE5 144k 26.5
35E ARUM168*TE5 168k 26.5
35F ARUM192*TE5 192k 30.9
35G ARUM216*TE5 216k 37.5
35H ARUM241*TE5 241k 37.5
36 Total ODU FACTORY Refrigerant Charge (Sum of factory refrigerant charges for all ODUs in the system, lines 35A -35H)
37 TOTAL SYSTEM CHARGE
Sum of Additional Refrigerant Charge Required (line 34) and Total ODU Factory Refrigerant Charge (line 35)
1CF (Ref.) = Correction Factor for Refrigerant Charge. 2For refrigerant charge purposes, consider only the liquid line; ignore the vapor line(s).

8|INTRODUCTION
MULTI V Ceiling Cassette Indoor Unit Engineering Manual
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REFRIGERANT CHARGE WORKSHEET
Water 5 System R410A Refrigerant Charge Calculator (lbs.)
System Tag or ID:
Job Name: __________________________________________
Project Manager: ____________________________________ Date: ______________
Line # Description Chassis I.D. Size Quantity CF (Ref.)1Total (lbs.)
1 Linear feet of 1/4" liquid line tubing2— — 0.015
2 Linear feet of 3/8" liquid line tubing2— — 0.041
3 Linear feet of 1/2" liquid line tubing2— — 0.079
4 Linear feet of 5/8" liquid line tubing2—— 0.116
5 Linear feet of 3/4" liquid line tubing2— — 0.179
6 Linear feet of 7/8" liquid line tubing2— — 0.238
7 Linear feet of 1" liquid line tubing2— — 0.323
8 Standard + Art Cool Mirror SJ, SK 5k to 15k 0.53
9 Standard + Art Cool Mirror SJ, SK 18k to 24k 0.62
10 Standard SV 30k to 36k 1.01
11 Art Cool Gallery SF 9k to 12k 0.22
12 1-Way Cassette TU 7k to 12k 0.44
13 1-Way Cassette TT 18k to 24k 0.64
14 2-Way Cassette TS 18k to 24k 0.75
15 4-Way 2' x 2' Cassette TR 5k to 7k 0.40
16 4-Way 2' x 2' Cassette TR 9k to 12k 0.55
17 4-Way 2' x 2' Cassette TQ 15k to 18k 0.71
18 4-Way 3' x 3' Cassette TA 7k to 48k 1.5
19 Mid Static Ducted M1 7k to 24k 0.57
20 High Static Ducted M2 7k to 24k 0.77
21 High Static Ducted M2 28k to 42k 1.15
22 High Static Ducted M3 28k to 54k 1.35
23 High Static Ducted B8 36k to 96k 2.20
24 Low Static Ducted, Low Static Ducted Bottom Return L1 5k to 9k 0.31
25 Low Static Ducted, Low Static Ducted Bottom Return L2 12k to 18k 0.42
26 Low Static Ducted, Low Static Ducted Bottom Return L3 21k to 24k 0.55
27 Vertical / Horizontal Air Handling Unit NJ 12k to 30k 1.04
28 Vertical / Horizontal Air Handling Unit NJ 36k 1.57
29 Vertical / Horizontal Air Handling Unit NK 42k to 54k 2.00
30 Floor Standing CE (U) 7k to 15k 0.37
31 Floor Standing CF (U) 18k to 24k 0.82
32 HRU: PRHR022A/023A, 032A/033A, 042A/043A — — 1.1
33 HRU: PRHR063A, 083A — — 2.2
34 ADDITIONAL Refrigerant Charge Required (Sum of lines 1 – 33)
35 Water-Source Unit Factory
Refrigerant Charge
ARWM072BAS5, ARWM096BAS5, ARWM121BAS5, ARWM144BAS5 7.7
ARWM072DAS5, ARWM096DAS5, ARWM121DAS5, ARWM144DAS5 7.7
ARWM168DAS5, ARWM192DAS5 9.9 9.9
36 Total WSU FACTORY Refrigerant Charge (Sum of factory refrigerant charges for all WSUs in the system)
37 TOTAL SYSTEM CHARGE
Sum of Additional Refrigerant Charge Required (line 34) and Total WSU Factory Refrigerant Charge (line 36)
1CF (Ref.) = Correction Factor for Refrigerant Charge. 2For refrigerant charge purposes, consider only the liquid line; ignore the vapor line(s).

INTRODUCTION | 9
Introduction
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REFRIGERANT CHARGE WORKSHEET
Multi V S System R410A Refrigerant Charge Calculator (lbs.)
System Tag or ID:
Job Name: __________________________________________
Project Manager: ____________________________________ Date: ______________
Line # Description Chassis I.D. Size Quantity CF (Ref.)1Total (lbs.)
1 Linear feet of 1/4" liquid line tubing2— — 0.015
2 Linear feet of 3/8" liquid line tubing2— — 0.041
3 Linear feet of 1/2" liquid line tubing2— — 0.079
4 Linear feet of 5/8" liquid line tubing2—— 0.116
5 Linear feet of 3/4" liquid line tubing2— — 0.179
6 Linear feet of 7/8" liquid line tubing2— — 0.238
7 Linear feet of 1" liquid line tubing2— — 0.323
8 Standard + Art Cool Mirror SJ, SK 5k to 15k 0.53
9 Standard + Art Cool Mirror SJ, SK 18k to 24k 0.62
10 Standard SV 30k to 36k 1.01
11 Art Cool Gallery SF 9k to 12k 0.22
12 1-Way Cassette TU 7k to 12k 0.44
13 1-Way Cassette TT 18k to 24k 0.64
14 2-Way Cassette TS 18k to 24k 0.75
15 4-Way 2' x 2' Cassette TR 5k to 7k 0.40
16 4-Way 2' x 2' Cassette TR 9k to 12k 0.55
17 4-Way 2' x 2' Cassette TQ 15k to 18k 0.71
18 4-Way 3' x 3' Cassette TA 7k to 48k 1.5
19 Mid Static Ducted M1 7k to 24k 0.57
20 High Static Ducted M2 7k to 24k 0.77
21 High Static Ducted M2 28k to 42k 1.15
22 High Static Ducted M3 28k to 54k 1.35
23 High Static Ducted B8 36k to 96k 2.20
24 Low Static Ducted, Low Static Ducted Bottom Return L1 5k to 9k 0.31
25 Low Static Ducted, Low Static Ducted Bottom Return L2 12k to 18k 0.42
26 Low Static Ducted, Low Static Ducted Bottom Return L3 21k to 24k 0.55
27 Vertical / Horizontal Air Handling Unit NJ 12k to 30k 1.04
28 Vertical / Horizontal Air Handling Unit NJ 36k 1.57
29 Vertical / Horizontal Air Handling Unit NK 42k to 54k 2.00
30 Floor Standing CE (U) 7k to 15k 0.37
31 Floor Standing CF (U) 18k to 24k 0.82
32 HRU: PRHR022A/023A, 032A/033A, 042A/043A — — 1.1
33 HRU: PRHR063A, 083A — — 2.2
34 ADDITIONAL Refrigerant Charge Required (Sum of lines 1 – 33)
35 Total Outdoor Unit Factory Refrigerant
Charge (Choose One)
35A ARUN024GSS4 0
35B ARUN038GSS4 0
35C ARUN048GSS4 0
35D ARUN053GSS4 0
35E ARUN060GSS4 0
35F ARUB060GSS4 0
36 TOTAL SYSTEM CHARGE
Sum of Additional Refrigerant Charge Required (line 34) and Total ODU Factory Refrigerant Charge (from line 35A to 35F)
1CF (Ref.) = Correction Factor for Refrigerant Charge. 2For refrigerant charge purposes, consider only the liquid line; ignore the vapor line(s).

ONE-WAY CEILING
CASSETTE
Mechanical Specifications on page 11
General Data on page 13
Electrical Data on page 15
External Dimensions on page 16
Electrical Wiring Diagrams on page 18
Refrigerant Flow Diagrams on page 20
Acoustic Data on page 21
Air Velocity / Temperature Distribution on page 25
Outside Air Ventilation on page 33
Capacity Tables on page 34
Optional Accessories on page 35

ONE-WAY | 11
One-Way Ceiling Cassette Product Data
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ONE-WAY CEILING CASSETTE
Casing
The case is designed to mount recessed in the ceiling and has a
surface-mounted concentric panel on the bottom of the unit. The unit
case is manufactured with coated metal. Cold surfaces are covered
with a coated polystyrene insulating material. The case is provided
with metal ears designed to support the unit weight on four corners.
Ears have pre-punched holes designed to accept field-supplied
all-thread rod hangers.
Ventilation Air
The case has a factory designated cutout for the connection of a
field-supplied outside air duct and flange.
Architectural Filter/Panel
The ceiling cassette assembly is provided with an off-white ABS
polymeric resin architectural panel with a tapered trim edge and a
hinged, spring clip (screw-less) return air filter-panel door.
Fan Assembly and Control
The indoor unit has a single, direct-drive, cross-flow tangential
Sirocco fan made of high strength ABS GP-2305 polymeric resin.
The fan motor is a Brushless Digitally Controlled (BLDC) design with
permanently lubricated and sealed ball bearings. The fan motor in-
cludes thermal, overcurrent and low RPM protection. The fan / motor
assembly is mounted on vibration attenuating rubber grommets. The
fan impeller is statically and dynamically balanced. The fan speed
is controlled using a microprocessor-based control algorithm 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-speed or auto-speed setting that
adjusts the fan speed to simulate natural airflow.
Air Filter
Return air is filtered with a removable, washable filter.
Airflow Guide Vanes
The architectural panel has a single directional slot diffuser with
an oscillating motorized guide vane designed to change the angle
airflow is discharged. The discharge range of motion is 40º in an
up/down direction with the capability of locking the vanes in a field
adjusted fixed position.
Microprocessor Controls
The unit is provided with an integrated microprocessor controller
capable of performing functions necessary to operate the system
without the use of a wall-mounted controller. A temperature
thermistor is factory-mounted in the return air stream. 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,
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, twisted, 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 automati-
cally switches control of the indoor unit between Cooling and Heating
modes based on space 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 indoor unit
operation when the indoor room temperature falls below set-point
temperature. At which point, a signal is sent to 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. The unit is equipped with
an infrared receiver designed to communicate with an LG wireless
remote controller. In lieu of wireless remote or factory return air
thermistor, screw terminals on the microprocessor circuit board ac-
commodate various models of wall-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-mounted wired controller(s)
2. Factory mounted return air thermistor or the optional wall-
mounted wired remote temperature sensor

12 | ONE-WAY
MULTI V Ceiling Cassette Indoor Unit Engineering Manual
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Controls Features
• Auto changeover (Heat Recovery only)
• Auto operation / auto restart
• External on / off control
• Dual thermistor control
• Dual setpoint control
• Filter life display
• Multiple auxiliary heater applications
• Group control
• High ceiling
• Hot start
• Self diagnostics
• Timer (on / off)
• Weekly schedule
• Auto direction/swing (up/down)
• Fan speed control
• Jet cool (fast cooling)
• Wi-Fi compatible
• Auto fan
• Leak detection
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EHVHWWR213OHDVHUHIHUWRWKH0XOWL90XOWL9,90XOWL9:DWHU,9
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A single indoor unit has the capability of being controlled by up to
two local wired controllers. The microprocessor controls space tem-
perature using the value provided by the temperature sensor sens-
ing 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
wall-mounted local or central controller, displayed diagnostic codes
are specific, alpha-numeric, and provide the service technician with
a reason for the code displayed.
Indoor units are Wi-Fi compatible with the addition of an LG Wi-Fi
module accessory, and can be controlled by LG’s ThinQ™ app on
a smart device. A field-supplied Wi-Fi network and smart device are
required. The ThinQ app is free, and is available for Android™ and
iOS. (Android is a trademark of Google LLC.)
Condensate Lift/Pump
The indoor unit comes with a factory installed and wired condensate
lift/pump capable of providing a maximum 27-9/16 inch lift from the
bottom surface of the unit. The lift pump comes with a safety switch
that shuts off the indoor unit if condensate rises too high in the
drain pan.
Condensate Drain Pan
The condensate drain pan is constructed of EPS (expandable poly-
styrene resin).
Coil
The indoor unit coil is constructed with grooved design copper tubes
with slit coil fins, two (2) rows, twenty-one (21) fins per inch.
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ONE-WAY CEILING CASSETTE

ONE-WAY | 13
One-Way Ceiling Cassette Product Data
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ONE-WAY CEILING CASSETTE
General Data
Model No. ARNU073TUD4 ARNU093TUD4 ARNU123TUD4
&RROLQJ0RGH3HUIRUPDQFH
Capacity (Btu/h) 7,500 9,600 12,300
Max Power Input1(W) 40 40 40
L/M/H Power Input at Factory Default (W) 16 / 18 / 20 18 / 20 / 22 20 / 22 / 24
+HDWLQJ0RGH3HUIRUPDQFH
Capacity (Btu/h) 8,500 10,900 13,600
Max Power Input1(W) 40 40 40
L/M/H Power Input at Factory Default (W) 16 / 18 / 20 18 / 20 / 22 20 / 22 / 24
(QWHULQJ0L[HG$LU
Cooling Max (°F WB) 76 76 76
Heating Min (°F DB) 59 59 59
8QLW'DWD
Refrigerant Type2R410A R410A R410A
Refrigerant Control EEV EEV EEV
Sound Pressure3dB(A) (H/M/L) 32 / 29 / 25 35 / 34 / 32 38 / 35 / 32
Sound Power4dB(A) (H) 50 53 57
Net Unit Weight (lbs.) 33 33 33
Shipping Weight (lbs.) 40 40 40
Panel Weight (lbs) 10 10 10
Panel Shipping Weight (lbs) 16 16 16
Communication Cable5(No. x AWG) 2 x 18 2 x 18 2 x 18
)DQ
Type Cross Flow Cross Flow Cross Flow
Quantity 111
Motor/Drive Brushless Digitally Controlled / Direct
Airflow Rate H/M/L (CFM) 290 / 258 / 226 325 / 304 / 290 353 / 325 / 290
3LSLQJ
Liquid Line (in., O.D.) 1/4 Flare 1/4 Flare 1/4 Flare
Vapor Line (in., O.D.) 1/2 Flare 1/2 Flare 1/2 Flare
Condensate Line (in., I.D.) 111
Table 1: One-Way Ceiling Cassette (TU Frames) Indoor Unit General Data.
EEV: Electronic Expansion Valve
Power wiring is field supplied and must comply with the applicable local and national codes. See page
15 for detailed electrical data.
This unit comes with a dry nitrogen charge.
All capacities are net with a combination ratio between 95-105%.
Rated capacity is certified under AHRI Standard 1230. Ratings are subject to change without notice.
Current certified ratings are available at www.ahridirectory.org.
Low ambient performance with LGRED° heat techlology is included in Multi V 5 air source units
produced after February 2019.
1Max power input is rated at maximum setting value.
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.
4Sound Power levels are tested in a reverberation room under ISO Standard 3741.
5Communication cable between Main ODU to IDUs / HRUs to be 18 AWG, 2-conductor, twisted, strand-
ed, shielded. Ensure the communication cable shield is properly grounded to the Main ODU chassis
only. Do not ground the ODU to IDUs / HRUs communication cable at any other point. Wiring must
comply with all applicable local and national codes.

14 | ONE-WAY
MULTI V Ceiling Cassette Indoor Unit Engineering Manual
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ONE-WAY CEILING CASSETTE
General Data
Model No. ARNU183TTD4 ARNU243TTD4
&RROLQJ0RGH3HUIRUPDQFH
Capacity (Btu/h) 19,100 24,200
Max Power Input1(W) 70 70
L/M/H Power Input at Factory Default (W) 24 / 28 /38 26 / 33 / 51
+HDWLQJ0RGH3HUIRUPDQFH
Capacity (Btu/h) 21,500 24,200
Max Power Input1(W) 70 70
L/M/H Power Input at Factory Default (W) 24 / 28 /38 26 / 33 / 51
(QWHULQJ0L[HG$LU
Cooling Max (°F WB) 76 76
Heating Min (°F DB) 59 59
8QLW'DWD
Refrigerant Type2R410A R410A
Refrigerant Control EEV EEV
Sound Pressure3dB(A) (H/M/L) 40 / 37 / 35 43 / 40 / 36
Sound Power4dB(A) (H) 59 62
Net Unit Weight (lbs.) 42 42
Shipping Weight (lbs.) 49 49
Panel Weight (lbs) 13 13
Panel Shipping Weight (lbs) 20 20
Communication Cable4(No. x AWG) 2 x 18 2 x 18
)DQ
Type Cross Flow Cross Flow
Quantity 11
Motor/Drive Brushless Digitally Controlled / Direct
Airflow Rate H/M/L (CFM) 470 / 427 / 385 515 / 470 / 406
3LSLQJ
Liquid Line (in., O.D.) 1/4 Flare 3/8 Flare
Vapor Line (in., O.D.) 1/2 Flare 5/8 Flare
Condensate Line (in., I.D.) 11
Table 2: One-Way Ceiling Cassette (TT Frames) Indoor Unit General Data.
EEV: Electronic Expansion Valve
Power wiring is field supplied and must comply with the applicable local and national codes. See page
15 for detailed electrical data.
This unit comes with a dry nitrogen charge.
All capacities are net with a combination ratio between 95-105%.
Rated capacity is certified under AHRI Standard 1230. Ratings are subject to change without notice.
Current certified ratings are available at www.ahridirectory.org.
Low ambient performance with LGRED° heat techlology is included in Multi V 5 air source units
produced after February 2019.
1Max power input is rated at maximum setting value.
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.
4Sound Power levels are tested in a reverberation room under ISO Standard 3741.
5Communication cable between Main ODU to IDUs / HRUs to be 18 AWG, 2-conductor, twisted, strand-
ed, shielded. Ensure the communication cable shield is properly grounded to the Main ODU chassis
only. Do not ground the ODU to IDUs / HRUs communication cable at any other point. Wiring must
comply with all applicable local and national codes.

ONE-WAY | 15
One-Way Ceiling Cassette Product Data
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ONE-WAY CEILING CASSETTE
Electrical Data
Model Number Voltage
Range MCA MOP Rated Amps (A)
Power Supply Power Input (W)
Hz Volts Phase Max
Cooling
Max
Heating L/M/H at Factory Default
78)UDPHV
ARNU073TUD4
187-253
0.23
15
0.18
60 208-230 1
40 40 16 / 18 / 20
ARNU093TUD4 0.23 0.18 40 40 18 / 20 / 22
ARNU123TUD4 0.23 0.18 40 40 20 / 22 / 24
77)UDPHV
ARNU183TTD4 187-253 0.38 15 0.30 60 208-230 1 70 70 24 / 28 /38
ARNU243TTD4 0.38 0.30 70 70 26 / 33 / 51
Table 3: One-Way Ceiling Cassette Indoor 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 circuit breaker.
Max. power input is rated at maximum setting value

16 | ONE-WAY
MULTI V Ceiling Cassette Indoor Unit Engineering Manual
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ONE-WAY CEILING CASSETTE
External Dimensions
Figure 3: ARNU073TUD4, ARNU093TUD4, ARNU123TUD4 Dimensions (PT-UAHW0 Panel).
TU Frame with PT-UAHW0 Panel
Note:
Outside Air Intake Hole
Vapor Pipe Connection
Outside Air Intake Hole
Maximum Condensate Lift: 27-9/16

ONE-WAY | 17
One-Way Ceiling Cassette Product Data
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ONE-WAY CEILING CASSETTE
External Dimensions
TT Frame with PT-TAHW0 Panel
Figure 4: ARNU183TTD4, ARNU243TTD4 Dimensions (PT-TAHW0 Panel).
Note:
Outside Air Intake Hole
Vapor Pipe Connection
Outside Air Intake Hole
Maximum Condensate Lift: 27-9/16

18 | ONE-WAY
MULTI V Ceiling Cassette Indoor Unit Engineering Manual
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Electrical Wiring Diagram
TU and TT Frames
ONE-WAY CEILING CASSETTE
Figure 5: TU, TT Frame Wiring Diagram.
5/18
*If a Third-Party Dry Contact and an LG internal heater or an LG Auxiliary Heater Kit is installed, supplemental heat capability cannot be controlled by the Third-Party Thermostat.

ONE-WAY | 19
One-Way Ceiling Cassette Product Data
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Electrical Wiring Diagram
Table 4: TU, TT Frame Wiring Diagram Legend.
ONE-WAY CEILING CASSETTE
Table 5: TU, TT Frame DIP Switch Settings.
TU and TT Frames
DIP Switch Setting Off On Remarks
SW3 GROUP CONTROL Main Sub Group control setting using 7-Day Programmable Controller; selects
Main / Sub 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
*For Gen 4 Multi V one-way ceiling cassette indoor units, DIP switches 1, 2, 5 through 8 must be set to OFF. These DIP switch-
es 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 5, Multi V IV,
Multi V Water IV, Multi V S Engineering Manual for additional information.
Terminal Purpose Function
CN_MOTOR1 Fan motor output Motor output of BLDC
CN_WF Wi-Fi module Wi-Fi module connection
CN-PTC Auxiliary heater Auxiliary heater connection
CN_DUST N/A N/A
CN_FLOAT Float switch input Float switch sensing
CN_EEV EEV output EEV control output
CN_DISPLAY Display Display of indoor status
CN_OPTION Option PCB (EEPROM) Option PCB connection
CN_ROOM Room sensor Room air thermistor
CN_PIPE_IN Suction pipe sensor Pipe in thermistor
CN_HUMID N/A N/A
CN_LEAK Leak sensor Leak sensor connection
CN_PIPE_OUT Discharge pipe sensor Pipe out thermistor
CN_EXT External on/off controller External on/off cotnroller connection
CN_REMO Remote controller Remote control connection
CN_CC Dry Contact Connection to Dry Contact (Optional)
CN_AIRC Air cleaner Air cleaner control
CN_VANE2 Step Motor Step motor output
CN_VANE1 Step Motor Step motor output
CN_DCDRAIN Drain pump output AC output for drain pump
CN_485 Communication Connection between indoor and outdoor units
CN_COMM Communication Connection on Sub PCB between indoor and outdoor units
CN_POWER AC Power supply AC power line input for indoor controller
*If a Third-Party Dry Contact and an LG internal heater or an LG Auxiliary Heater Kit is installed, supplemental heat capability cannot be controlled by the Third-Party Thermostat.

20 | ONE-WAY
MULTI V Ceiling Cassette Indoor Unit Engineering Manual
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ONE-WAY CEILING CASSETTE
Refrigerant Flow Diagram
Figure 6: TU, TT Frame Piping Diagram.
Model Liquid (inch) Gas (inch)
78)UDPHV
ARNU073TUD4
1/4 1/2
ARNU093TUD4
ARNU123TUD4
77)UDPHV
ARNU183TTD4 1/4 1/2
ARNU243TTD4 3/8 5/8
Thermistor Description
TH1 Return air thermistor
TH2 Pipe in thermistor
TH3 Pipe out thermistor
Heat Exchanger
C.F.F.
lndoor unit
EEV Filter
Filter
Th3 Th2
Th1
Heating
Cooling
Table 6: TU, TT Frame Refrigerant Pipe Connection Port Diameters.
TU and TT Frames
Table 7: TU, TT Frame Thermistors.