LG Multi V ARNU073TUD4 User manual

CEILING CASSETTE INDOOR UNIT
INSTALLATION MANUAL
Four-Way 3'x 3'Models
• ARNU073TNA4
• ARNU093TNA4
• ARNU123TNA4
• ARNU153TNA4
• ARNU183TNA4
• ARNU243TNA4
• ARNU283TMA4
• ARNU363TMA4
• ARNU423TMC4
• ARNU483TMC4
One-Way Models
• ARNU073TUD4
• ARNU093TUD4
• ARNU123TUD4
• ARNU183TTD4
• ARNU243TTD4
Four-Way 2'x 2'Models
• ARNU053TRD4
• ARNU073TRD4
• ARNU093TRD4
• ARNU123TRD4
• ARNU153TQD4
• ARNU183TQD4
Two-Way Models
• ARNU183TSA4
• ARNU243TSA4

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,
installation, best practices, and owner’s 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
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 CONTENTS
Safety Instructions ...................................................................................................................................................................................................... 4-7
Unit Nomenclature...........................................................................................................................................................................................................8
Introduction.................................................................................................................................................................................................................9-11
General Data ............................................................................................................................................................................................................ 12-28
6SHFL¿FDWLRQV ........................................................................................................................................................................................................ 13-19
(OHFWULFDO'DWD .............................................................................................................................................................................................................19
'LPHQVLRQV........................................................................................................................................................................................................... 20-26
5HIULJHUDQW3LSLQJ'LDJUDPV ................................................................................................................................................................................. 27-28
General Installation Guidelines.............................................................................................................................................................................. 29-34
/RFDWLRQ6HOHFWLRQ ................................................................................................................................................................................................. 29-30
5HTXLUHG&OHDUDQFHV...................................................................................................................................................................................................30
8QSDFNDQG,QVSHFW.....................................................................................................................................................................................................31
,QVWDOO&DVVHWWH)UDPH........................................................................................................................................................................................... 32-34
Refrigerant Piping ................................................................................................................................................................................................... 35-40
,QVWDOO&DVVHWWH)UDPH3LSLQJ0DWHULDOVDQG+DQGOLQJ..............................................................................................................................................35
3LSH6XSSRUWV..............................................................................................................................................................................................................36
3LSLQJ3UHSDUDWLRQ................................................................................................................................................................................................. 37-39
3LSLQJ3UHSDUDWLRQ.......................................................................................................................................................................................................39
3LSH&RQQHFWLRQV,QVXODWLQJWKH5HIULJHUDQW3LSLQJ ..................................................................................................................................................40
General Condensate Piping.................................................................................................................................................................................... 41-42
Install Decorative Cover.......................................................................................................................................................................................... 43-44
Wiring ....................................................................................................................................................................................................................... 45-64
*HQHUDO,QIRUPDWLRQ6HSDUDWLQJ:LULQJDQG&DEOHV ..................................................................................................................................................45
3RZHU:LULQJ&RPPXQLFDWLRQ&DEOH&RQQHFWLRQV....................................................................................................................................................46
3RZHU6XSSO\3RZHU:LULQJ6SHFL¿FDWLRQV...............................................................................................................................................................47
&RPPXQLFDWLRQV&DEOH6SHFL¿FDWLRQV .................................................................................................................................................................. 48-50
&RQQHFWLRQ3URFHGXUH........................................................................................................................................................................................... 51-52
2QH:D\&DVVHWWH7778)UDPHV........................................................................................................................................................................ 53-55
7ZR:D\&DVVHWWH76)UDPH................................................................................................................................................................................ 56-58
)RXU:D\&DVVHWWH)UDPHV................................................................................................................................................................................... 59-63
&RQWUROOHUDQG2SW:DOO0RXQWHG6HQVRU,QVWDOODWLRQ.................................................................................................................................................64
Controls Setup......................................................................................................................................................................................................... 65-70
Installation Checklist............................................................................................................................................................................................... 71-72

4
MULTI V Ceiling Cassette Indoor Units
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.
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 below.
SAFETY INSTRUCTIONS
WARNING
Do not install or remove the unit by yourself (customer).
Ask the dealer or an authorized technician to install the unit.
,PSURSHULQVWDOODWLRQE\WKHXVHUPD\UHVXOWLQZDWHUOHDNDJH¿UH
H[SORVLRQHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
For replacement of an installed unit, always contact an
authorized LG service provider.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNH[SORVLRQDQGSK\VLFDOLQMXU\RU
GHDWK
The outdoor unit is shipped with refrigerant and the service
valves closed. Do not open service valves on the unit
until all non-condensibles have been removed from the pip-
ing system and authorization has been obtained from the
commissioning agent.
7KHUHLVDULVNRISK\VLFDOLQMXU\RUGHDWK
Do not run the compressor with the service valves
closed.
7KHUHLVULVNRIH[SORVLRQSK\VLFDOLQMXU\RUGHDWK
Periodically check that the outdoor unit is not damaged.
7KHUHLVULVNRIH[SORVLRQSK\VLFDOLQMXU\RUGHDWK
Replace all control box and panel covers.
,IFRYHUSDQHOVDUHQRWLQVWDOOHGVHFXUHO\GXVWZDWHUDQGDQLPDOVPD\
HQWHUWKHXQLWFDXVLQJ¿UHHOHFWULFVKRFNDQGSK\VLFDOLQMXU\RUGHDWK
Always check for system refrigerant leaks after the unit has
been installed or serviced.
([SRVXUHWRKLJKFRQFHQWUDWLRQOHYHOVRIUHIULJHUDQWJDVPD\OHDGWR
LOOQHVVRUGHDWK
Do not install the unit using defective hanging, attaching,
or mounting hardware.
7KHUHLVULVNRISK\VLFDOLQMXU\RUGHDWK
Wear protective gloves when handling equipment.
6KDUSHGJHVPD\FDXVHSHUVRQDOLQMXU\
Dispose the packing materials safely.
• 3DFNLQJPDWHULDOVVXFKDVQDLOVDQGRWKHUPHWDORUZRRGHQSDUWV
PD\FDXVHSXQFWXUHZRXQGVRURWKHULQMXULHV
• 7HDUDSDUWDQGWKURZDZD\SODVWLFSDFNDJLQJEDJVVRWKDWFKLOGUHQ
PD\QRWSOD\ZLWKWKHPDQGULVNVXIIRFDWLRQDQGGHDWK
Do not install the unit in any location exposed to open Àame
or extreme heat. Do not touch the unit with wet hands.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNH[SORVLRQDQGSK\VLFDOLQMXU\RUGHDWK
Install the unit considering the potential for earthquakes.
,PSURSHULQVWDOODWLRQPD\FDXVHWKHXQLWWRIDOOUHVXOWLQJLQSK\VLFDO
LQMXU\RUGHDWK
Do not change the settings of the protection devices.
,IWKHSUHVVXUHVZLWFKWKHUPDOVZLWFKRURWKHUSURWHFWLRQGHYLFHLV
VKRUWHGDQGIRUFHGWRRSHUDWHLPSURSHUO\RUSDUWVRWKHUWKDQWKRVH
VSHFL¿HGE\/*DUHXVHGWKHUHLVULVNRI¿UHHOHFWULFVKRFNH[SORVLRQ
DQGSK\VLFDOLQMXU\RUGHDWK
If the air conditioner is installed in a small space, take mea-
sures to prevent the refrigerant concentration from exceed-
ing safety limits in the event of a refrigerant leak.
&RQVXOWWKHODWHVWHGLWLRQRI$6+5$($PHULFDQ6RFLHW\RI+HDWLQJ
5HIULJHUDWLQJDQG$LU&RQGLWLRQLQJ(QJLQHHUV6WDQGDUG,IWKHUH-
IULJHUDQWOHDNVDQGVDIHW\OLPLWVDUHH[FHHGHGLWFRXOGUHVXOWLQSHUVRQDO
LQMXULHVRUGHDWKIURPR[\JHQGHSOHWLRQ
INSTALLATION
DANGER
Do not use or store Àammable gas or combustibles near the unit.
7KHUHLVULVNRISURGXFWIDLOXUH¿UHH[SORVLRQDQGSK\VLFDOLQMXU\RUGHDWK
TABLE OF SYMBOLS
DANGER 7KLVV\PEROLQGLFDWHVDQLPPLQHQWO\KD]DUGRXVVLWXDWLRQZKLFKLIQRWDYRLGHGZLOOUHVXOWLQGHDWKRUVHULRXVLQMXU\
WARNING 7KLVV\PEROLQGLFDWHVDSRWHQWLDOO\KD]DUGRXVVLWXDWLRQZKLFKLIQRWDYRLGHGFRXOGUHVXOWLQGHDWKRUVHULRXVLQMXU\
CAUTION 7KLVV\PEROLQGLFDWHVDSRWHQWLDOO\KD]DUGRXVVLWXDWLRQZKLFKLIQRWDYRLGHGPD\UHVXOWLQPLQRURUPRGHUDWHLQMXU\
7KLVV\PEROLQGLFDWHVVLWXDWLRQVWKDWPD\UHVXOWLQHTXLSPHQWRUSURSHUW\GDPDJHDFFLGHQWVRQO\
7KLVV\PEROLQGLFDWHVDQDFWLRQWKDWVKRXOGQRWEHSHUIRUPHG

5
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 INSTRUCTIONS
INSTALLATION – CONTINUED
Properly insulate all cold surfaces to prevent “sweating.”
&ROGVXUIDFHVVXFKDVXQLQVXODWHGSLSHFDQJHQHUDWHFRQGHQVDWHWKDW
PD\GULSDQGFDXVHDVOLSSHU\ÀRRUFRQGLWLRQDQGRUZDWHUGDPDJHWR
ZDOOV
When installing the unit in a hospital, mechanical room, or
similar electromagnetic ¿eld (EMF) sensitive environment,
provide suႈcient protection against electrical noise.
,QYHUWHUHTXLSPHQWSRZHUJHQHUDWRUVKLJKIUHTXHQF\PHGLFDOHTXLS
PHQWRUUDGLRFRPPXQLFDWLRQHTXLSPHQWPD\FDXVHWKHDLUFRQGLWLRQHU
WRRSHUDWHLPSURSHUO\7KHXQLWPD\DOVRDIIHFWVXFKHTXLSPHQWE\FUHDW-
LQJHOHFWULFDOQRLVHWKDWGLVWXUEVPHGLFDOWUHDWPHQWRULPDJHEURDGFDVW-
LQJ
Do not use the product for special purposes such as pre-
serving foods, works of art, wine coolers, or other precision
air conditioning applications. This equipment is designed to
provide comfort cooling and heating.
7KHUHLVULVNRISURSHUW\GDPDJH
Do not make refrigerant substitutions. Use R410A only.
,IDGLIIHUHQWUHIULJHUDQWLVXVHGRUDLUPL[HVZLWKRULJLQDOUHIULJHUDQWWKH
XQLWZLOOPDOIXQFWLRQDQGEHGDPDJHG
Do not install the unit in a noise sensitive area.
When connecting refrigerant tubing, remember to allow for
pipe expansion.
,PSURSHUSLSLQJPD\FDXVHUHIULJHUDQWOHDNVDQGV\VWHPPDOIXQFWLRQ
Take appropriate actions at the end of HVAC equipment life
to recover, recycle, reclaim or destroy R410A refrigerant ac-
cording to applicable U.S. Environmental Protection Agency
(EPA) rules.
Periodically check that the outdoor unit is not damaged.
7KHUHLVDULVNRIHTXLSPHQWGDPDJH
Install the unit in a safe location where no one can step on or
fall onto it. Do not install the unit with defective hanging,
attaching, or mounting hardware.
7KHUHLVULVNRIXQLWDQGSURSHUW\GDPDJH
Install the drain hose to ensure adequate drainage.
7KHUHLVDULVNRIZDWHUOHDNDJHDQGSURSHUW\GDPDJH
Do not store or use Àammable gascombustibles near the
unit.
7KHUHLVULVNRISURGXFWIDLOXUH
Always check for system refrigerant leaks after the unit has
been installed or serviced.
/RZUHIULJHUDQWOHYHOVPD\FDXVHSURGXFWIDLOXUH
The unit is shipped with refrigerant and the service valves
closed. Do not open service valves on the unit until all
non-condensibles have been removed from the piping sys-
tem and authorization to do so has been obtained from the
commissioning agent.
7KHUHLVDULVNRIUHIULJHUDQWFRQWDPLQDWLRQUHIULJHUDQWORVVDQGHTXLS
PHQWGDPDJH
CAUTION
Be very careful when transporting the product.
•'RQRWDWWHPSWWRFDUU\WKHSURGXFWZLWKRXWDVVLVWDQFH
• 6RPHSURGXFWVXVHSRO\SURS\OHQHEDQGVIRUSDFNDJLQJ 'RQRWXVHSRO\SURS\OHQHEDQGVWROLIWWKHXQLW
• 6XVSHQGWKHXQLWIURPWKHEDVHDWVSHFLILHGSRVLWLRQV
• 6XSSRUWWKHXQLWDPLQLPXPRIIRXUSRLQWVWRDYRLGVOLSSDJHIURPULJJLQJDSSDUDWXV

6
MULTI V Ceiling Cassette Indoor Units
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 INSTRUCTIONS
WIRING
DANGER
High voltage electricity is required to operate this system.
Adhere to the National Electrical Codes and these
instructions when wiring.
,PSURSHUFRQQHFWLRQVDQGLQDGHTXDWHJURXQGLQJFDQFDXVHDFFLGHQWDO
LQMXU\RUGHDWK
Always ground the unit following local, state, and National
Electrical Codes.
Turn the power oႇat the nearest disconnect before servicing
the equipment.
(OHFWULFVKRFNFDQFDXVHSK\VLFDOLQMXU\RUGHDWK
Properly size all circuit breakers or fuses.
WARNING
The information contained in this manual is intended for use
by an industry-quali¿ed, experienced, certi¿ed electrician
familiar with the U.S. National Electric Code (NEC) who is
equipped with the proper tools and test instruments.
)DLOXUHWRFDUHIXOO\UHDGDQGIROORZDOOLQVWUXFWLRQVLQWKLVPDQXDOFDQ
UHVXOWLQHTXLSPHQWPDOIXQFWLRQSURSHUW\GDPDJHSHUVRQDOLQMXU\RU
GHDWK
Ensure the unit is connected to a dedicated power source
that provides adequate power.
,IWKHSRZHUVRXUFHFDSDFLW\LVLQDGHTXDWHRUWKHHOHFWULFZRUNLVQRW
SHUIRUPHGSURSHUO\LWPD\UHVXOWLQ¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RU
GHDWK
Refer to local, state, and federal codes, and use power wires
of suႈcient current capacity and rating.
:LUHVWKDWDUHWRRVPDOOPD\JHQHUDWHKHDWDQGFDXVHD¿UH
Secure all ¿eld wiring connections with appropriate wire
strain relief.
,PSURSHUO\VHFXULQJZLUHVZLOOFUHDWHXQGXHVWUHVVRQHTXLSPHQWSRZHU
OXJV,QDGHTXDWHFRQQHFWLRQVPD\JHQHUDWHKHDWFDXVHD¿UHDQG
SK\VLFDOLQMXU\RUGHDWK
Properly tighten all power connections.
/RRVHZLULQJPD\RYHUKHDWDWFRQQHFWLRQSRLQWVFDXVLQJD¿UHSK\VLFDO
LQMXU\RUGHDWK
Do not cut, lengthen or shorten the communications and power cable between any dry contact unit and its connected indoor
unit. Do not install the unit in a location where the communications and power cable cannot be safely and easily connected
between the two units. Do not allow strain on this cable.
3RRUFDEOHFRQQHFWLRQVFDQFDXVHHTXLSPHQWPDOIXQFWLRQ

7
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.
OPERATION
DANGER
Do not provide power to or operate the unit if it is Àooded
or submerged.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
Use a dedicated power source for this product.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
Do not operate the disconnect switch with wet hands.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
Periodically verify the hanging bolts and other hardware
securing the unit have not deteriorated.
,IWKHXQLWIDOOVIURPLWVLQVWDOOHGORFDWLRQLWFDQFDXVHSURSHUW\GDPDJH
SURGXFWIDLOXUHSK\VLFDOLQMXU\RUGHDWK
If refrigerant gas leaks out, ventilate the area before operat-
ing the unit.
,IWKHXQLWLVPRXQWHGLQDQHQFORVHGORZO\LQJRUSRRUO\YHQWLODWHGDUHD
DQGWKHV\VWHPGHYHORSVDUHIULJHUDQWOHDNLWPD\FDXVH¿UHHOHFWULF
VKRFNH[SORVLRQSK\VLFDOLQMXU\RUGHDWK
SAFETY INSTRUCTIONS
Clean up the site after installation is ¿nished, and check
that no metal scraps, screws, or bits of wiring have been left
inside or surrounding the unit.
Do not use this equipment in mission critical or special-
purpose applications such as preserving foods, works of art,
wine coolers or refrigeration. This equipment is designed to
provide comfort cooling and heating.
Provide power to the compressor crankcase heaters at least
six (6) hours before operation begins.
6WDUWLQJRSHUDWLRQZLWKDFROGFRPSUHVVRUVXPSVPD\UHVXOWLQVHYHUH
EHDULQJGDPDJHWRWKHFRPSUHVVRUV.HHSWKHSRZHUVZLWFKRQGXULQJ
WKHRSHUDWLRQDOVHDVRQ
Do not block the inlet or outlet.
8QLWPD\PDOIXQFWLRQ
Securely attach the electrical cover to the indoor unit. Non-
secured covers can result in ¿re due to dust or water in the
service panel.
Periodically verify the equipment mounts have not deterio-
rated.
,IWKHEDVHFROODSVHVWKHXQLWFRXOGIDOODQGFDXVHSURSHUW\GDPDJHRU
SURGXFWIDLOXUH
Do not allow water, dirt, or animals to enter the unit.
7KHUHLVULVNRIXQLWIDLOXUH
WARNING
Do not allow water, dirt, or animals to enter the unit.
7KHUHLVULVNRIXQLWIDLOXUH¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
Avoid excessive cooling and periodically perform ventilation
to the unit.
,QDGHTXDWHYHQWLODWLRQLVDKHDOWKKD]DUG
Do not touch the refrigerant piping during or after opera-
tion.
,WFDQFDXVHEXUQVRUIURVWELWH
Do not operate the unit with the panel(s) or protective
cover(s) removedkeep ¿ngers and clothing away from
moving parts.
7KHURWDWLQJKRWFROGDQGKLJKYROWDJHSDUWVRIWKHXQLWFDQFDXVH
SK\VLFDOLQMXU\RUGHDWK
Periodically check power cable and connection for damage.
&DEOHPXVWEHUHSODFHGE\WKHPDQXIDFWXUHULWVVHUYLFHDJHQWRUVLPLODU
TXDOL¿HGSHUVRQVLQRUGHUWRDYRLGSK\VLFDOLQMXU\DQGRUHOHFWULFVKRFN
Do not open the inlet grille of the unit during operation.
Do not operate the unit with the panels or guards re-
moved. Do not open the inlet grille of the unit during op-
eration. Do not insert hands or other objects through the
inlet or outlet when the unit is powered. Do not touch the
electrostatic ¿lter, if the unit includes one. The unit contains
sharp, rotating, hot, and high voltage parts that can cause
personal injury andor electric shock.
7KHXQLWFRQWDLQVVKDUSURWDWLQJKRWDQGKLJKYROWDJHSDUWVWKDWFDQ
FDXVHSHUVRQDOLQMXU\DQGRUHOHFWULFVKRFN
Ensure no power is connected to the unit other than as
directed in this manual. Remove power from the unit before
removing or servicing the unit.
7KHUHLVULVNRIXQLWIDLOXUH¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
Securely attach the electrical cover to the unit.
1RQVHFXUHGHOHFWULFDOFRYHUVFDQUHVXOWLQEXUQVRUHOHFWULFVKRFNGXHWR
GXVWRUZDWHULQWKHVHUYLFHSDQHO
CAUTION
To avoid physical injury, use caution when cleaning or servicing the air conditioner.

8
MULTI V Ceiling Cassette Indoor Units
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.
Cassette Indoor Units Nomenclature
ARN U05 3TR C
Generation
4 = Fourth
TN = 4-Way Ceiling Cassette (3’x3’)
TM = 4-Way Ceiling Cassette (3’x3’)
TR = 4-Way Ceiling Cassette (2’x2’)
TQ = 4-Way Ceiling Cassette (2’x2’)
TS = 2-Way Ceiling Cassette
TT = 1-Way Ceiling Cassette
TU = 1-Way Ceiling Cassette
Electrical Ratings
3 = 208–230V/60Hz/1Phase
Nominal Capacity
(Nominal cooling capacity in Btu/h)
Type
U = Inverter Heat Pump
Family
ARN = Multi V Indoor Unit (Refrigerant R410A)
4
Feature
A, C, L, R = Standard
05 = 5,500
07 = 7,500
09 = 9,600
12 = 12,300
15 = 15,400
18 = 19,100
24 = 24,200
28 = 28,000
36 = 36,200
42 = 42,000
48 = 48,000
UNIT NOMENCLATURE
Chassis/Model Type

9
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.
INTRODUCTION
Ceiling Cassette Indoor Units
This manual describes how to install the LG One-Way, Two-Way, and
Four-Way Ceiling Cassette indoor units (IDU) for Multi V Variable
Refrigerant Flow (VRF) heat pump and heat recovery systems. The
table on the next page lists the available models. Refer to LG’s Multi
V Ceiling Cassette Indoor Unit Engineering Manual for complete
detailed engineering data and selection procedures.
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 instal-
lation. Plan the work and do not work alone, if possible. Know
how to obtain emergency medical and fire fighting assistance.
Installation Personnel
This equipment is intended for installation by personnel trained
in the required construction, mechanical, electrical, and/or other
disciplines.
• Connecting cable (power and control)
• Pipes - vapor line and liquid line, with insulation
• 3/8" or 1/2" Threaded hanger rods
• 3/8" or 1/2" nuts, flat washers, and lock/split washers
• Insulated drain hose
• Additional drain hose
• Level
• Screwdriver
• Electrical lineman pliers
• Electric drill
• Holesaw
• Drill
• Flaring tool set
• Tubing cutter
• Tube/pipe reamer
• Torque wrenches
• Allen wrench
• Gas-leak detector
• Thermometer
WARNING
,QVWDOODWLRQZRUNPXVWEHSHUIRUPHGE\WUDLQHGSHUVRQQHODQGLQ
DFFRUGDQFHZLWKQDWLRQDOZLULQJVWDQGDUGVDQGDOOQDWLRQDOVWDWHORFDO
RURWKHUDSSOLFDEOHFRGHV,PSURSHULQVWDOODWLRQFDQUHVXOWLQ¿UHHOHFWULF
VKRFNSK\VLFDOLQMXU\RUGHDWK
3OHDVHUHDGLQVWUXFWLRQVEHIRUHLQVWDOOLQJWKLVSURGXFW%HFRPHIDPLOLDU
ZLWKWKHXQLW¶VFRPSRQHQWVDQGFRQQHFWLRQVDQGWKHRUGHURILQVWDOODWLRQ
,QFRUUHFWLQVWDOODWLRQFDQGHJUDGHRUSUHYHQWSURSHURSHUDWLRQ
Figure 1: One-Way TU, TT Frame.
Figure 2: Two-Way TS Frame.
Filter
Return Air
Supply Air
RemoteCont roller
TEMP
Wired Remote Controller (Optional)
Figure 3: Four-Way TQ, TR, TM, TN Frame.
Wired Remote Controller (Optional)
Filter
Return Air
Supply Air
RemoteController
TEMP
Required Tools (field provided)
Required Parts (field provided)
Air Outlet
Air Intake
Wired Remote Controller
(Optional)
Filter

10
MULTI V Ceiling Cassette Indoor Units
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.
Included Parts (Depends on Model)
Part Quantity Image Part Quantity Image
Drain Hose One (1) Cable Ties Four (4)
Metal
Clamp Two (2)
Conduit Bracket
(Appearances
Will Vary
Depending on
Model)
One (1)
Insulation
for Fittings
One (1)
Set
Washers for
Hanging
Bracket
Eight (8)
Paper Pattern
for Installation One (1)
Table 1: Included Items.
For Vapor Piping For Liquid Piping
INTRODUCTION
Table 2: Required Accessory Table (Sold Separately).
Part Quantity Image
Four-Way Ceiling Cassette Grille Kit
(PT-QCHW0 [2x2] or PT-MCHW0 [3x3]) One (1)

11
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 3: Multi V Cassette Indoor Units.
INTRODUCTION
Unit Model Number
Ceiling Cassette One-Way ARNU073TUD4
ARNU093TUD4
ARNU123TUD4
ARNU183TTD4
ARNU243TTD4
Ceiling Cassette: Two-Way
ARNU183TSA4
ARNU243TSA4
Ceiling Cassette: Four-Way (2' x 2') ARNU053TRD4
ARNU073TRD4
ARNU093TRD4
ARNU123TRD4
ARNU153TQD4
ARNU183TQD4
&HLOLQJ&DVVHWWH)RXU:D\ƍ[ƍ ARNU073TNA4
ARNU093TNA4
ARNU123TNA4
ARNU153TNA4
ARNU183TNA4
ARNU243TNA4
ARNU283TMA4
ARNU363TMA4
ARNU423TMC4
ARNU483TMC4

12
MULTI V Ceiling Cassette Indoor Units
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.
R410A Refrigerant
R410A refrigerant has a higher operating pressure in comparison to R22 refrigerant. All piping system materials installed must have a higher
resisting pressure than the materials traditionally used in R22 systems.
R410A refrigerant is an azeotrope of R32 and R125, mixed at 50:50, so the ozone depletion potential (ODP) is 0.
WARNING
'RQRWSODFHWKHUHIULJHUDQWF\OLQGHULQGLUHFWVXQOLJKW5HIULJHUDQWF\OLQGHUZLOOH[SORGHFDXVLQJVHYHUHLQMXU\RUGHDWK
• %HFDXVH5$LVDFRPELQDWLRQRI5DQG5WKHUHTXLUHGDGGLWLRQDOUHIULJHUDQWPXVWEHFKDUJHGLQLWVOLTXLGVWDWH,IWKHUHIULJHUDQWLV
FKDUJHGLQLWVJDVHRXVVWDWHLWVFRPSRVLWLRQFKDQJHVDQGWKHV\VWHPZLOOQRWZRUNSURSHUO\
•'RQRWKHDWSLSLQJPRUHWKDQQHFHVVDU\GXULQJLQVWDOODWLRQ3LSLQJZLOOEHFRPHVRIWDQGIDLOZKHQSUHVVXUL]HG
•'RQRWXVHDQ\SLSLQJWKDWKDVQRWEHHQDSSURYHGIRUXVHLQKLJKSUHVVXUHUHIULJHUDQWV\VWHPV3LSLQJZDOOWKLFNQHVVPXVWFRPSO\ZLWK
WKHDSSOLFDEOHORFDOVWDWHDQGIHGHUDOFRGHVIRUWKHSVLGHVLJQSUHVVXUHRI5$,QDGHTXDWHSLSLQJZLOOIDLOZKHQSUHVVXUL]HG
GENERAL DATA

13
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. ARNU073TUD4 ARNU093TUD4 ARNU123TUD4 ARNU183TTD4 ARNU243TTD4
Cooling Mode Performance
Capacity (Btu/h) 7,500 9,600 12,300 19,100 24,200
Max. Power Input1(W) 40 40 40 70 70
L/M/H Power Input at Factory Default (W) 16 / 18 / 20 18 / 20 / 22 20 / 22 / 24 24 / 28 / 38 26 / 33 / 51
Heating Mode Performance
Capacity (Btu/h) 8,500 10,900 13,600 21,500 24,200
Max. Power Input1(W) 40 40 40 70 70
L/M/H Power Input at Factory Default (W) 16 / 18 / 20 18 / 20 / 22 20 / 22 / 24 24 / 28 / 38 26 / 33 / 51
Entering Mixed Air
Cooling Max (°F WB) 76 76 76 76 76
Heating Min (°F DB) 59 59 59 59 59
Unit Data
Refrigerant Type2R410A R410A R410A R410A R410A
Refrigerant Control EEV EEV EEV EEV EEV
Sound Pressure3dB(A) (H/M/L) 32 / 29 / 25 35 / 34 / 32 38 / 35 / 32 40 / 37 / 35 43 / 40 / 36
Net Unit Weight (lbs.) 33 33 33 42 42
Shipping Weight (lbs.) 40 40 40 49 49
Grille Weight (lbs) 10 10 10 13 13
Grille Shipping Weight (lbs) 16 16 16 20 20
Communication Cable4(No. x AWG) 2 x 18 2 x 18 2 x 18 2 x 18 2 x 18
Fan
Type Cross Flow Cross Flow Cross Flow Cross Flow Cross Flow
Quantity 11111
Motor/Drive Brushless Digitally Controlled / Direct
Airflow Rate H/M/L (CFM) 290 / 258 / 226 325 / 304 / 290 353 / 325 / 290 470 / 427 / 385 515 / 470 / 406
Piping
Liquid Line (in., O.D.) 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 5/8 Flare
Condensate Line (in., I.D.) 11111
Table 4: One-Way Ceiling Cassette (TU and TT Frames) Indoor Unit General Data.
GENERAL DATA
6SHFL¿FDWLRQV
EEV: Electronic Expansion Valve
3RZHUZLULQJLV¿HOGVXSSOLHGDQGPXVWFRPSO\ZLWKWKHDSSOLFDEOHORFDODQGQDWLRQDO
codes. See page 19 for detailed electrical data.
This unit comes with a dry nitrogen charge.
All capacities are net with a combination ratio between 95-105%.
5DWHGFDSDFLW\LVFHUWL¿HGXQGHU$+5,6WDQGDUG5DWLQJVDUHVXEMHFWWRFKDQJH
ZLWKRXWQRWLFH&XUUHQWFHUWL¿HGUDWLQJVDUHDYDLODEOHDWZZZDKULGLUHFWRU\RUJ
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.
4Communication cable between Master ODU to IDUs / HRUs to be 18 AWG, 2-conductor,
twisted, stranded, shielded. Ensure the communication cable shield is properly grounded
to the Master ODU chassis only. Do not ground the ODU to IDUs / HRUs communica-
tion cable at any other point. Wiring must comply with all applicable local and national
codes.

14
MULTI V Ceiling Cassette Indoor Units
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.
GENERAL DATA
6SHFL¿FDWLRQV
Model No. ARNU183TSA4 ARNU243TSA4
Cooling Mode Performance
Capacity (Btu/h) 19,100 24,200
Max. Power Input1(W) 70 70
L/M/H Power Input at Factory Default (W) 24 / 29 / 34 25 / 30 / 40
Heating Mode Performance
Capacity (Btu/h) 21,500 27,300
Max. Power Input1(W) 70 70
L/M/H Power Input at Factory Default (W) 24 / 29 / 34 25 / 30 / 40
Entering Mixed Air
Cooling Max (°F WB) 76 76
Heating Min (°F DB) 59 59
Unit Data
Refrigerant Type2R410A R410A
Refrigerant Control EEV EEV
Sound Pressure3dB(A) (H/M/L) 35 / 33 / 31 40 / 37 / 33
Net Unit Weight (lbs.) 39.9 39.9
Shipping Weight (lbs.) 49.6 49.6
Grille Weight (lbs) 10.3 10.3
Grille Shipping Weight (lbs) 14.3 14.3
Communication Cable4(No. x AWG) 2 x 18 2 x 18
Fan
Type Turbo Fan Turbo Fan
Quantity 11
Motor/Drive Brushless Digitally Controlled / Direct
Airflow Rate H/M/L (CFM) 459 / 424 / 353 601 / 530 / 459
Piping
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 5: Two-Way Ceiling Cassette (TS Frames) Indoor Unit General Data.
EEV: Electronic Expansion Valve
3RZHUZLULQJLV¿HOGVXSSOLHGDQGPXVWFRPSO\ZLWKWKHDSSOLFDEOHORFDODQGQDWLRQDO
codes. See page 19 for detailed electrical data.
This unit comes with a dry nitrogen charge.
All capacities are net with a combination ratio between 95-105%.
5DWHGFDSDFLW\LVFHUWL¿HGXQGHU$+5,6WDQGDUG5DWLQJVDUHVXEMHFWWRFKDQJH
ZLWKRXWQRWLFH&XUUHQWFHUWL¿HGUDWLQJVDUHDYDLODEOHDWZZZDKULGLUHFWRU\RUJ
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.
4Communication cable between Master ODU to IDUs / HRUs to be 18 AWG, 2-conductor,
twisted, stranded, shielded. Ensure the communication cable shield is properly grounded
to the Master ODU chassis only. Do not ground the ODU to IDUs / HRUs communica-
tion cable at any other point. Wiring must comply with all applicable local and national
codes.

15
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.
GENERAL DATA
6SHFL¿FDWLRQV
Model No. ARNU053TRD4 ARNU073TRD4 ARNU093TRD4 ARNU123TRD4 ARNU153TQD4 ARNU183TQD4
Cooling Mode Performance
Capacity (Btu/h) 5,500 7,500 9,600 12,300 15,400 19,100
Max. Power Input1(W) 30 30 30 30 30 30
L/M/H Power Input at Factory
Default (W) 11 / 12 / 13 11 / 12 / 13 12 / 13 / 14 13 / 15 / 17 18 / 21 / 24 19 / 22 / 25
Heating Mode Performance
Capacity (Btu/h) 6,100 8,500 10,900 13,600 17,100 21,500
Max. Power Input1(W) 30 30 30 30 30 30
L/M/H Power Input at Factory
Default (W) 11 / 12 / 13 11 / 12 / 13 12 / 13 / 14 13 / 15 / 17 18 / 21 / 24 19 / 22 / 25
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) 29 / 27 / 26 29 / 27 / 26 30 / 29 / 27 32 / 30 / 27 36 / 34 / 32 37 / 35 / 34
Net Unit Weight (lbs.) 29 29 32 32 35 35
Shipping Weight (lbs.) 34 34 38 38 40 40
Grille Weight (lbs) 777777
Grille Shipping Weight (lbs) 999999
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 Turbo Turbo Turbo Turbo Turbo Turbo
Quantity 111111
Motor/Drive Brushless Digitally Controlled / Direct
Airflow Rate H/M/L (CFM) 265 / 247 / 212 265 / 247 / 212 283 / 265 / 251 307 / 283 / 247 388 / 353 / 328 396 / 388 / 353
Piping
Liquid Line (in., O.D.) 1/4 Flare 1/4 Flare 1/4 Flare 1/4 Flare 1/4 Flare 1/4 Flare
Vapor Line (in., O.D.) 1/2 Flare 1/2 Flare 1/2 Flare 1/2 Flare 1/2 Flare 1/2 Flare
Condensate Line (in., I.D.) 111111
Table 6: Four-Way Ceiling Cassette (2' x 2' TR and TQ Frames) Indoor Unit General Data.
EEV: Electronic Expansion Valve
3RZHUZLULQJLV¿HOGVXSSOLHGDQGPXVWFRPSO\ZLWKWKHDSSOLFDEOHORFDODQGQDWLRQDO
codes. See page 19 for detailed electrical data.
This unit comes with a dry nitrogen charge.
All capacities are net with a combination ratio between 95-105%.
5DWHGFDSDFLW\LVFHUWL¿HGXQGHU$+5,6WDQGDUG5DWLQJVDUHVXEMHFWWRFKDQJH
ZLWKRXWQRWLFH&XUUHQWFHUWL¿HGUDWLQJVDUHDYDLODEOHDWZZZDKULGLUHFWRU\RUJ
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.
4Communication cable between Master ODU to IDUs / HRUs to be 18 AWG, 2-conductor,
twisted, stranded, shielded. Ensure the communication cable shield is properly grounded
to the Master ODU chassis only. Do not ground the ODU to IDUs / HRUs communica-
tion cable at any other point. Wiring must comply with all applicable local and national
codes.

16
MULTI V Ceiling Cassette Indoor Units
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.
GENERAL DATA
6SHFL¿FDWLRQV
Model No. ARNU073TNA4 ARNU093TNA4 ARNU123TNA4 ARNU153TNA4
Cooling Mode Performance
Capacity (Btu/h) 7,500 9,600 12,300 15,400
Max. Power Input1(W) 144 144 144 144
L/M/H Power Input at Factory Default (W) 12 / 15 / 18 12 / 15 / 19 14 / 17 / 22 14 / 17 / 25
Heating Mode Performance
Capacity (Btu/h) 8,500 10,900 13,600 17,100
Max. Power Input1(W) 144 144 144 144
L/M/H Power Input at Factory Default (W) 12 / 15 / 18 12 / 15 / 19 14 / 17 / 22 14 / 17 / 25
Entering Mixed Air
Cooling Max (°F WB) 76 76 76 76
Heating Min (°F DB) 59 59 59 59
Unit Data
Refrigerant Type2R410A R410A R410A R410A
Refrigerant Control EEV EEV EEV EEV
Sound Pressure3dB(A) (H/M/L) 29 / 26 / 24 29 / 26 / 24 31 / 29 / 26 32 / 29 / 26
Net Unit Weight (lbs.) 53.6 53.6 53.6 53.6
Shipping Weight (lbs.) 66.1 66.1 66.1 66.1
Grill Weight (lbs) 14 14 14 14
Grill Shipping Weight (lbs) 21 21 21 21
Communication Cable4(No. x AWG) 2 x 18 2 x 18 2 x 18 2 x 18
Fan
Type Turbo Turbo Turbo Turbo
Quantity 1111
Motor/Drive Brushless Digitally Controlled / Direct
Airflow Rate H/M/L (CFM) 459 / 424 / 388 477 / 424 / 388 494 / 459 / 424 530 / 459 / 424
Piping
Liquid Line (in., O.D.) 3/8 Flare 3/8 Flare 3/8 Flare 3/8 Flare
Vapor Line (in., O.D.) 5/8 Flare 5/8 Flare 5/8 Flare 5/8 Flare
Condensate Line (in., I.D.) 1111
Table 7: Four-Way Ceiling Cassette (3' x 3' TN Frames) Indoor Unit General Data.
EEV: Electronic Expansion Valve
3RZHUZLULQJLV¿HOGVXSSOLHGDQGPXVWFRPSO\ZLWKWKHDSSOLFDEOHORFDODQGQDWLRQDO
codes. See page 19 for detailed electrical data.
This unit comes with a dry nitrogen charge.
All capacities are net with a combination ratio between 95-105%.
5DWHGFDSDFLW\LVFHUWL¿HGXQGHU$+5,6WDQGDUG5DWLQJVDUHVXEMHFWWRFKDQJH
ZLWKRXWQRWLFH&XUUHQWFHUWL¿HGUDWLQJVDUHDYDLODEOHDWZZZDKULGLUHFWRU\RUJ
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.
4Communication cable between Master ODU to IDUs / HRUs to be 18 AWG, 2-conductor,
twisted, stranded, shielded. Ensure the communication cable shield is properly grounded
to the Master ODU chassis only. Do not ground the ODU to IDUs / HRUs communica-
tion cable at any other point. Wiring must comply with all applicable local and national
codes.

17
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.
GENERAL DATA
6SHFL¿FDWLRQV
Model No. ARNU183TNA4 ARNU243TNA4
Cooling Mode Performance
Capacity (Btu/h) 19,100 24,200
Max. Power Input1(W) 144 144
L/M/H Power Input at Factory Default (W) 14 / 18 / 27 30 / 38 / 51
Heating Mode Performance
Capacity (Btu/h) 21,500 27,300
Max. Power Input1(W) 144 144
L/M/H Power Input at Factory Default (W) 14 / 18 / 27 30 / 38 / 51
Entering Mixed Air
Cooling Max (°F WB) 76 76
Heating Min (°F DB) 59 59
Unit Data
Refrigerant Type2R410A R410A
Refrigerant Control EEV EEV
Sound Pressure3dB(A) (H/M/L) 34 / 30 / 26 40 / 38 / 35
Net Unit Weight (lbs.) 53.6 53.6
Shipping Weight (lbs.) 66.1 66.1
Grill Weight (lbs) 14 14
Grill Shipping Weight (lbs) 21 21
Communication Cable4(No. x AWG) 2 x 18 2 x 18
Fan
Type Turbo Turbo
Quantity 11
Motor/Drive Brushless Digitally Controlled / Direct
Airflow Rate H/M/L (CFM) 565 / 530 / 424 742 / 671 / 600
Piping
Liquid Line (in., O.D.) 3/8 Flare 3/8 Flare
Vapor Line (in., O.D.) 5/8 Flare 5/8 Flare
Condensate Line (in., I.D.) 11
Table 8: Four-Way Ceiling Cassette (3' x 3' TN Frames) Indoor Unit General Data, continued.
EEV: Electronic Expansion Valve
3RZHUZLULQJLV¿HOGVXSSOLHGDQGPXVWFRPSO\ZLWKWKHDSSOLFDEOHORFDODQGQDWLRQDO
codes. See page 19 for detailed electrical data.
This unit comes with a dry nitrogen charge.
All capacities are net with a combination ratio between 95-105%.
5DWHGFDSDFLW\LVFHUWL¿HGXQGHU$+5,6WDQGDUG5DWLQJVDUHVXEMHFWWRFKDQJH
ZLWKRXWQRWLFH&XUUHQWFHUWL¿HGUDWLQJVDUHDYDLODEOHDWZZZDKULGLUHFWRU\RUJ
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.
4Communication cable between Master ODU to IDUs / HRUs to be 18 AWG, 2-conductor,
twisted, stranded, shielded. Ensure the communication cable shield is properly grounded
to the Master ODU chassis only. Do not ground the ODU to IDUs / HRUs communica-
tion cable at any other point. Wiring must comply with all applicable local and national
codes.

18
MULTI V Ceiling Cassette Indoor Units
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.
GENERAL DATA
6SHFL¿FDWLRQV
Model No. ARNU283TMA4 ARNU363TMA4 ARNU423TMC4 ARNU483TMC4
Cooling Mode Performance
Capacity (Btu/h) 28,000 36,200 42,000 48,100
Max. Power Input1(W) 144 144 144 144
L/M/H Power Input at Factory Default (W) 31 / 43 / 52 34 / 47 / 64 53 / 75 / 104 66 / 80 / 120
Heating Mode Performance
Capacity (Btu/h) 31,500 40,600 43,800 51,200
Max. Power Input1(W) 144 144 144 144
L/M/H Power Input at Factory Default (W) 31 / 43 / 52 34 / 47 / 64 53 / 75 / 104 66 / 80 / 120
Entering Mixed Air
Cooling Max (°F WB) 76 76 76 76
Heating Min (°F DB) 59 59 59 59
Unit Data
Refrigerant Type2R410A R410A R410A R410A
Refrigerant Control EEV EEV EEV EEV
Sound Pressure3dB(A) (H/M/L) 41 / 39 / 35 44 / 41 / 37 45 / 41 / 38 46 / 42 / 40
Net Unit Weight (lbs.) 58.4 58.4 59 59
Shipping Weight (lbs.) 70.5 70.5 69 69
Grill Weight (lbs) 14 14 14 14
Grill Shipping Weight (lbs) 21 21 21 21
Communication Cable4(No. x AWG) 2 x 18 2 x 18 2 x 18 2 x 18
Fan
Type Turbo Turbo Turbo Turbo
Quantity 1111
Motor/Drive Brushless Digitally Controlled / Direct
Airflow Rate H/M/L (CFM) 812 / 741 / 635 918 / 812 / 706 1,059 / 918 / 812 1,130 / 953 / 883
Piping
Liquid Line (in., O.D.) 3/8 Flare 3/8 Flare 3/8 Flare 3/8 Flare
Vapor Line (in., O.D.) 5/8 Flare 5/8 Flare 5/8 Flare 5/8 Flare
Condensate Line (in., I.D.) 1111
Table 9: Four-Way Ceiling Cassette (3' x 3' TM Frames) Indoor Unit General Data.
EEV: Electronic Expansion Valve
3RZHUZLULQJLV¿HOGVXSSOLHGDQGPXVWFRPSO\ZLWKWKHDSSOLFDEOHORFDODQGQDWLRQDO
codes. See page 19 for detailed electrical data.
This unit comes with a dry nitrogen charge.
All capacities are net with a combination ratio between 95-105%.
5DWHGFDSDFLW\LVFHUWL¿HGXQGHU$+5,6WDQGDUG5DWLQJVDUHVXEMHFWWRFKDQJH
ZLWKRXWQRWLFH&XUUHQWFHUWL¿HGUDWLQJVDUHDYDLODEOHDWZZZDKULGLUHFWRU\RUJ
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.
4Communication cable between Master ODU to IDUs / HRUs to be 18 AWG, 2-conductor,
twisted, stranded, shielded. Ensure the communication cable shield is properly grounded
to the Master ODU chassis only. Do not ground the ODU to IDUs / HRUs communica-
tion cable at any other point. Wiring must comply with all applicable local and national
codes.

19
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.
GENERAL DATA
Electrical Data
Model Voltage
Range MCA (A) MOP (A) Rated Amps (A)
Power Supply Power Input (W)
Hz Volts Phase Max.
Cooling
Max.
Heating
L / M / H at
Factory Default
One-Way Ceiling Cassette Indoor Units
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
ARNU183TTD4 0.38 0.30 70 70 24 / 28 / 38
ARNU243TTD4 0.38 0.30 70 70 26 / 33 / 51
Two-Way Ceiling Cassette Indoor Units
ARNU183TSA4 187-253 0.84 15 0.30 60 208-230 1 70 70 24 / 29 / 34
ARNU243TSA4 0.84 0.30 70 70 25 / 30 / 40
Four-Way Ceiling Cassette (2'x 2') Indoor Units
ARNU053TRD4
187-253
0.25
15
0.20
60 208-230 1
30 30 11 / 12 / 13
ARNU073TRD4 0.25 0.20 30 30 11 / 12 / 13
ARNU093TRD4 0.25 0.20 30 30 12 / 13 / 14
ARNU123TRD4 0.25 0.20 30 30 13 / 15 / 17
ARNU153TQD4 0.25 0.20 30 30 18 / 21 / 24
ARNU183TQD4 0.25 0.20 30 30 19 / 22 / 25
Four-Way Ceiling Cassette (3' x 3', 9-11/16" High) Indoor Units
ARNU073TNA4
187-253
0.71
15
0.56
60 208-230 1
144 144 12 / 15 / 18
ARNU093TNA4 0.71 0.56 144 144 12 / 15 / 19
ARNU123TNA4 0.71 0.56 144 144 14 / 17 / 22
ARNU153TNA4 0.71 0.56 144 144 14 / 17 / 25
ARNU183TNA4 0.71 0.56 144 144 14 / 18 / 27
ARNU243TNA4 0.71 0.56 144 144 30 / 38 / 51
Four-Way Ceiling Cassette (3' x 3', 11-5/16" High) Indoor Units
ARNU283TMA4
187-253
1.6
15
1.3
60 208-230 1
144 144 31 / 43 / 52
ARNU363TMA4 1.6 1.3 144 144 34 / 47 / 64
ARNU423TMC4 1.6 1.3 144 144 53 / 75 / 104
ARNU483TMC4 1.6 1.3 144 144 66 / 80 / 120
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 a fuse, use the circuit breaker.
Max. power input is rated at maximum setting value.
Table 10: Ceiling Cassette Indoor Units Electrical Data.
(OHFWULFDO'DWD

20
MULTI V Ceiling Cassette Indoor Units
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.
GENERAL DATA
'LPHQVLRQV±78)UDPHZLWK3788&*ULOOH
43-5/16
19-11/161-3/8
34-11/16 (Air outlet Hole)
6-5/8
4-3/16
8-1/8
10-11/16
3-13/16
5-1/4
2-1/4
17-13/16
1-1/16
12-5/8
39-13/16
3-7/16
33-11/16
Unit: inches
Note: All measurements
have a tolerance of ±1/4 in.
2-3/4Ø
1/8Ø
2-3/4
2-5/8
Outdoor air knockout
12
13-7/8
37-1/2