LG MULTI V ARNU18GTLA4 User manual

www.lg.com
P/NO : MFL69440006
Please read this installation manual completely before installing the product.
Installation work must be performed in accordance with the national wiring standards
by authorized personnel only.
Please retain this installation manual for future reference after reading it thoroughly.
CEILING CASSETTE - 2WAY
Original instruction
INSTALLATION MANUAL
AIR
CONDITIONER
ENGLISH

2Indoor Unit
Ceiling Cassette - 2Way Type Indoor Unit Installation Manual
TABLE OF CONTENTS
o Installation guide map
oFour type "A" screws & plas-
tic anchors
oConnecting cable
oPipes: Gas side
Liquid side
(Refer to Product
Data)
oInsulation materials
oAdditional drain pipe
oLevel gauge
oScrew driver
oElectric drill
oHole core drill
oHorizontal meter
oFlaring tool set
oSpecified torque wrenches
(different depending on model No.)
oSpanner.......Half union
oHexagonal wrench
oGas-leak detector
oVacuum pump
oGauge manifold
oOwner's manual
oThermometer
Installation Parts ...................3
Safety Precautions.................4
Installation
Selection of the best
location...................................6
Ceiling dimension and hang-
ing bolt location......................7
Wiring Connection.................8
Installation of Decoration
Panel......................................9
Drain Piping .........................10
DIP Switch Setting ..............12
Group Control Setting .........13
Model Designation ..............18
Airborne Noise Emission ....18
Limiting concentration .........18
Installation Requirements Required Parts Required Tools

Installation Manual 3
Installation Parts
Anti-bacteria filter
Air Outlet
Air Intake
Wired Remote Controller(Accessory)
Installation Parts
Name Drain hose Clamp metal
Washer for
hanging bracket
Clamp
(Tie Wrap)
Insulation for
fitting
Quantity 1 EA 2 EA 8 set 4 EA 1 EA
Shape
• Screws for fixing panels are attached to decoration panel.
for gas pipe
for liquid pipe
(Other)
• Paper pattern for
installation
• Owner's manual
• Installation man-
ual
ENGLISH
Installation Tool

Do not modify or extend the
power cable.
• There is risk of fire or electric
shock.
Do not let the air conditioner
run for a long time when the
humidity is very high and a
door or a window is left open.
• Moisture may condense and
wet or damage furniture.
Be cautious when unpacking
and installing the product.
• Sharp edges could cause in-
jury. Be especially careful of the
case edges and the fins on the
condenser and evaporator.
Safety Precautions
4Indoor Unit
Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must be
followed.
nBe sure to read before installing the air conditioner.
nBe sure to observe the cautions specified here as they include important items related to safety.
nIncorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classi-
fied by the following indications.
nMeanings of symbols used in this manual are as shown below.
WARNING
CAUTION
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
Be sure not to do.
Be sure to follow the instruction.
WARNING
nInstallation
Do not use a defective or un-
derrated circuit breaker. Use
this appliance on a dedicated
circuit.
• There is risk of fire or electric
shock.
For electrical work, contact
the dealer, seller, a qualified
electrician, or an Authorized
Service Center.
• Do not disassemble or repair
the product. There is risk of fire
or electric shock.
Always ground the product.
• There is risk of fire or electric
shock.
Install the panel and the
cover of control box securely.
• There is risk of fire or electric
shock.
Always install a dedicated
circuit and breaker.
• Improper wiring or installation
may cause fire or electric
shock.
Use the correctly rated
breaker or fuse.
• There is risk of fire or electric
shock.

Installation Manual 5
Safety Precautions
nOperation
For installation, always con-
tact the dealer or an Author-
ized Service Center.
• There is risk of fire, electric
shock, explosion, or injury.
Do not install the product on
a defective installation stand.
• It may cause injury, accident, or
damage to the product.
Be sure the installation area
does not deteriorate with age.
• If the base collapses, the air
conditioner could fall with it,
causing property damage,
product failure, and personal in-
jury.
Do not store or use flammable gas or combustibles near the product.
• There is risk of fire or failure of product.
Use two or more people to lift and transport the product.
• Avoid personal injury.
Use a vacuum pump or inert (nitrogen) gas
when doing leakage test or air purge. Do not
compress air or oxygen, and do not use flam-
mable gases. Otherwise, it may cause fire or
explosion.
• There is the risk of death, injury, fire or explosion.
Do not turn on the breaker or power under
condition that front panel, cabinet, top cover,
control box cover are removed or opened.
• Otherwise, it may cause fire, electric shock, ex-
plosion or death.
ENGLISH
Always check for gas (refrig-
erant) leakage after installa-
tion or repair of product.
• Low refrigerant levels may
cause failure of product.
Install the drain hose to en-
sure that water is drained
away properly.
• A bad connection may cause
water leakage.
Keep level even when in-
stalling the product.
• To avoid vibration or water
leakage.
CAUTION
nInstallation

• There should not be any heat source or steam near the unit.
• There should not be any obstacles to the air circulation.
• A place where air circulation in the room will be good.
• A place where drainage can be easily obtained.
• A place where noise prevention is taken into consideration.
• Do not install the unit near the door way.
• Ensure the spaces indicated by arrows from the wall, ceiling, or other obstacles.
• The indoor unit must have the maintenance space.
Read completely, then follow step by step.
Unit:mm
Ceiling
Ceiling Board
Ceiling Board
200 or more
Above 1 800
3 000 or less
1 000
or more
500 or
more
500 or
more
300 or less
Floor
20±3
Installation
Selection of the best location
CAUTION : In case that the unit is installed near the sea, the installation parts
may be corroded by salt. The installation parts (and the unit) should be taken ap-
propriate anti-corrosion measures.
Installation
6Indoor Unit

Installation Manual 7
Installation
ENGLISH
Ceiling dimension and hanging bolt location
Level gauge
Ceiling
Ceiling board
1 010 (Ceiling opening)
877 (Hanging bolt)
482(Hanging bolt)
830 60
550
59
600 (Ceiling opening)
unit: mm
• The dimensions of the paper model for installation are the same as those of the ceiling
opening dimensions.
• Avoid the following installation location.
1. Such places as restaurants and kitchen where considerable amount of oil steam and flour is
generated.
These may cause heat exchange efficiency reduction, or water drops, drain pump mal-function.
In these cases, take the following actions;
• Make sure that ventilation fan is enough to cover all noxious gases from this place.
• Ensure enough distance from the cooking room to install the air conditioner in such a place
where it may not suck oily steam.
2. Avoid installng air conditioner in such
places where cooking oil or iron
powder is generated.
3. Avoid places where inflammable gas
is generated.
4. Avoid places where noxious gas is
generated.
5. Avoid places near high frequency
generators.
NOTICE
CAUTION :
• This air-conditioner uses a drain
pump.
• Install the unit horizontally using a
level gauge.
• During the installation, care should
be taken not to damage electric
wires.
• Select and mark the position for fixing bolts
and piping hole.
• Decide the position for fixing bolts slightly
tilted to the drain direction after considering
the direction of drain hose.
• Drill the hole for anchor bolt on the wall.
Use the ventilation fan
for smoke-collecting
hood with sufficient
capacity.
Cooking table
Air conditioner
Take enough
distance

Set screw of
paper pattern (4 pieces)
Paper pattern
for installation
90 mm
Adjust the
same height
Ceiling board
Ceiling
Flat washer for M10
(accessory)
Keep the length of the bolt
from the bracket to 40 mm
Open the ceiling board
along the outer edge of the
paper pattern
Flat washer for M10
(accessory)
Hanging bolt
(W3/8 or M10)
Nut
(W3/8 or M10)
Nut
(W3/8 or M10) Air Conditioner body
Ceiling board
Ceiling board
Ceiling board
• The following parts are local purchasing.
①Hanging Bolt - W 3/8 or M10
②Nut - W 3/8 or M10
③Spring Washer - M10
④Plate Washer - M10
Terminal Block Indoor
Terminal Block of outdoor unit
1(L) 2(N) 3 4
INDOOR POWER INPUT
B
SODU IDU INTERNET DRY1 DRY2 GND 12V
BA
A B A - - - -
Outdoor unit
Connect the wires to the terminals on the control board individually according to the outdoor unit
connection.
• Ensure that the color of the wires of outdoor unit and the terminal No. are the same as those of
indoor unit respectively.
Wiring Connection
WARNING : Make sure that the screws of the terminal are free from looseness.
CAUTION : The Power cord connected to the unit should be selected according
to the following specifications.
CAUTION : Tighten the nut and bolt
to prevent the unit from falling.
Installation
8Indoor Unit

Installation Manual 9
Installation
ENGLISH
Piping side
Air conditioner unit
Decorative panel
Push
Decorative panel
fixing screws
(hexagon M6 screws)
Temporary fitting
at 2 poles
(Tightening about 10 mm)
Control box cover
Cover
Plasma filter
Key holes
Decorative panel
fixing screws
(Hexagon M6 screw)
Louver motor
Ratch
pull
Inlet Grille
Cool air leakage
(no good)
Decoration panel
Air conditioner
unit
Ceiling
board
Fit the insulator (this part) and
be careful for cool air leakage
Decoration panel
Air conditioner
unit
Ceiling
board
Good example Bad example
Installation of Decoration Panel
CAUTION : Install
certainly the dec-
oration panel.
Cool air leakage
causes sweating.
Water drops
fall.
1. Temporarily fix two decoration panel fixing screws (hexagon M5 screw) on the unit body.
(Tighten by amount 10 mm in length.) The fixing screws (hexagon M5 screw) are in-
cluded the indoor unit box.
2.
Remove the air inlet grille from the decoration panel. (Remove the hook for the air inlet grille cord.)
3. Hook the decoration panel key hole ( ) on the screws fixed in step above, and slide
the panel so that the screws reach the key hole edge.
4.
Retighten completely two temporarily fixed screws and other two screws. (Total 4 screws)
5. Connect the louver motor connector and display connector.
6. After tightening these screws, install the air inlet grille (including the air filter).
The decoration panel has its installa-
tion direction.
Before installing the decoration panel, al-
ways remove the paper template.

• Drain piping must have down-slope (1/50 to
1/100): be sure not to provide up-and-down slope
to prevent reversal flow.
• During drain piping connection, be careful not to
exert extra force on the drain port on the indoor
unit.
• The outside diameter of the drain connection on
the indoor unit is 32 mm.
• Be sure to install heat insulation on the drain pip-
ing.
Piping material: Polyvinyl chloride pipe VP-25
and pipe fittings
The air conditioner uses a drain pump to drain water.
Use the following procedure to test the drain pump operation:
• Connect the main drain pipe to the exte-
rior and leave it provisionally until the
test comes to an end.
• Feed water to the flexible drain hose
and check the piping for leakage.
• Be sure to check the drain pump for nor-
mal operating and noise when electrical
wiring is complete.
• When the test is complete, connect the
flexible drain hose to the drain port on
the indoor unit.
Heat insulation material: Polyethylene foam
with thickness more than 8 mm.
Drain test
Flexible drain hose
Maintenance
drain port
Upward
routing
not allowed
Pipe clamp
Indoor unit
1/50~1/100
MAX 700 mm
Feed water
Drain Pump
Drain pan
Flexible drain hose
(accessory)
Main
drain pipe
Glue the joint
Drain
port
Drain hose connection
Use the clip (accessory)
Flexible drain hose
1/50~1/100 slope
Hanger
distance Hanger Bracket
Max 700 mm
Flexible drain hose
Insulation
Metal
clamp
Max 300 mm 1~15 m
Drain Piping
CAUTION : The supplied flexible
drain hose should not be curved,
neither screwed. The curved or
screwed hose may cause a leakage
of water.
Installation
10 Indoor Unit

Installation Manual 11
Installation
ENGLISH
CAUTION:
After the confirmation of the above conditions, prepare the wiring as follows:
1) Never fail to have separate power specially for the air conditioner. As for the
method of wiring, follow the circuit diagram pasted on the inside of control
box cover.
2) Provide a circuit breaker switch between power source and the unit.
3) The screw which fasten the wiring in the casing of electrical fittings are liable
to come loose from vibrations to which the unit is subjected during the
course of transportation. Check them and make sure that they are all tightly
fastened. (If they are loose, it could give rise to burn-out of the wires.)
4) Confirm the Specification of power source
5) Confirm that electrical capacity is sufficient.
6) Be sure that the starting voltage is maintained at more than 90 % of the rated
voltage marked on the name plate.
7) Confirm that the cable thickness is as specified in the power sources specifi-
cation.
(Particularly note the relation between cable length and thickness.)
8) Do not install the leakage breaker in a place which is wet or moist.
Water or moist may cause short circuit.
9) The following troubles would be caused by voltage drop-down.
• Vibration of a magnetic switch, damage on the contact point there of, fuse break-
ing, disturbance to the normal function of a overload protection device.
• Proper starting power is not given to the compressor.
HAND OVER
Teach the customer the operation and maintenance procedures, using the operation manual.
(air filter cleaning, temperature control, etc.)

Installation
12 Indoor Unit
DIP Switch Setting
For Multi V Models, DIP switch 1, 2, 6, 8 must be set OFF.
Function Description Setting Off Setting On Default
SW1 Communication N/A (Default) - - Off
SW2 Cycle N/A (Default) - - Off
SW3 Group Control Selection of Master or
Slave Master Slave Off
SW4 Dry Contact
Mode
Selection of Dry Con-
tact
Mode
Wired/Wireless remote
controller
selection of Manual or Auto
operation Mode
Auto Off
SW5 Installation
Fan continuous
operation
Continuous operation
Removal
- Off
SW6 Heater linkage N/A - - Off
SW7
Ventilator link-
age
Selection of Ventilator
linkage Linkage Removal Working
Off
Vane selection
(Console)
Selection of up/down
side Vane Up side + Down side Vane Up side Vane Only
Region selec-
tion
Selection tropical
region General model Tropical model
SW8 Etc. Spare - - Off
CAUTION
1. Indoor Unit
2. Outdoor Unit
In case that the products meet specific conditions, “Auto addressing” function can start automatically
with the improved speed by turning the DIP switch #3 of the outdoor unit and resetting the power.
* Specific conditions:
- All names of the indoor units are ARNU****4.
- The serial number of Multi V super IV (outdoor units) is after October 2013.
DIP switch 7 segment
Outdoor Unit PCB Outdoor Unit DIP Switch

Installation Manual 13
Installation
ENGLISH
Group Control Setting
GND
Signal
12 V
Master Slave Slave Slave
Display Error Message Only connect serial signal and
GND lines between indoor units.
or
LGAP Network System
Master
1. Group Control 1
nWired remote controller 1 + Standard Indoor Units
Some products have no DIP switch on PCB. It is possible to set indoor units to Master or Slave by
using the wireless remote controller instead of DIP switch.
For the details of the setting, please refer to the manual of the wireless remote controller.
1. It is possible to 16 indoor units(Max.) by one wired remote controller.
Set only one indoor unit to Master, set the others to Slave.
2. It is possible to connect with every type of indoor units.
3. It is possible to use wireless remote controller at the same time.
4. It is possible to connect with Dry Contact and Central controller at the same time.
- The Master indoor unit is possible to recognize Dry Contact and Central Controller only.
5. In case that any error occurs at indoor unit, the error code is displayed on the wired remote
controller.
It is possible to control the other indoor units except the error units.
nDIP Switch in PCB
¿Master Setting
- No. 3 Off
¡Slave Setting
- No. 3 On
Indoor Unit DIP Switch

Installation
14 Indoor Unit
GND
Signal
12 V
Slave
Slave
Master
or
Donʼt connect serial 12V line
LGAP Network System
Master
MasterMaster
Display Error Message
h It is possible to connect indoor units since Feb. 2009.
h It can be the cause of malfuctions when there is no setting of master and slave.
hIn case of Group Control, it is possible to use following functions.
- Selection of operation, stop or mode
- Temperature setting and room temperature check
- Current time change
- Control of flow rate (High/Middle/Low)
- Reservation settings
It is not possible to use some functions.
hIt is possible to control 16 indoor units(Max.) with the master wired remote control.
hOther than those, it is same with the Group Control 1.
2. Group Control 2
nWired remote controllers + Standard Indoor Units

Installation Manual 15
Installation
ENGLISH
GND
Signal
12 V
LGAP Network System
FAU
Master
FAU
or
Slave
Master
Slave
Master
Master
Display Error Message Display Error Message
NM
FAU Standard Standard FAU FAU Standard Standard FAU
* FAU : Fresh Air Intake Unit
Standard: Standard Indoor Unit
hIn case of connecting with standard indoor unit and Fresh Air Intake Unit, separate Fresh
Air Intake Unit with standard units. (N, M ≤ 16) (Because setting temperature are different.)
hOther than those, it is same with Group Control 1.
3. Group Control 3
nMixture connection with indoor units and Fresh Air Intake Unit

Installation
16 Indoor Unit
LGAP Network System
Master
Master Slave
GND
Signal
12 V
Slave
Slave
Slave
or
Display Error Message
4. 2 Remote Control
nWired remote controller 2 + Indoor unit 1
1. It is possible to connect two wired remote controllers (Max.) with one indoor unit.
Set only one indoor unit to Master, set the others to Slave.
Set only one wired remote controller to Master, set the others to Slave.
2. Every types of indoor unit is possible to connect two remote controller.
3. It is possible to use wireless remote controller at the same time.
4. It is possible to connect with Dry Contact and Central controller at the same time.
5. In case that any error occurs at indoor unit, the error code is displayed on the wired
remote controller.
6. There isnʼt limits of indoor unit function.

Installation Manual 17
Installation
ENGLISH
Indoor unit 2 EA +Wired remote controller 1 EA Indoor unit 1 EA +Wired remote controller 2 EA
h PZCWRCG3 cable used for connection h PZCWRC2 cable used for connection
Slave
Master
Master
PZCWRCG3
Master Slave
PZCWRC2
• Apply totally enclosed noncombustible conduit in case of local building code Requiring
plenum cable usage.
CAUTION
5. Accessories for group control setting
It is possible to set group control by using below accessories.

Installation
18 Indoor Unit
The A-weighted sound pressure emitted by this product is below 70 dB.
** The noise level can vary depending on the site.
The figures quoted are emission level and are not necessarily safe working levels. Whilst there is a cor-
relation between the emission and exposure levels, this cannot be used reliably to determine whether
or not further precautions are required. Factor that influence the actual level of exposure of the work-
force include the characteristics of the work room and the other sources of noise, i.e. the number of
equipment and other adjacent processes and the length of time for which an operator exposed to the
noise. Also, the permissible exposure level can vary from country to country. This information, however,
will enable the user of the equipment to make a better evaluation of the hazard and risk.
Model Designation
Airborne Noise Emission
Limiting concentration is the limit of Freon gas concentration where immediate measures can be
taken without hurting human body when refrigerant leaks in the air. The limiting concentration shall
be described in the unit of kg/m3(Freon gas weight per unit air volume) for facilitating calculation
nCalculate refrigerant concentration
Refrigerant concentration =
Total amount of replenished refrigerant in refrigerant facility (kg)
Capacity of smallest room where indoor unit is installed (m3)
Limiting concentration
Serial Number
Chassis Name
Electrical Ratings
1:1 Ø, 115 V, 60 Hz
6:1 Ø, 220 - 240 V, 50 Hz
3:1 Ø, 208/230 V, 60 Hz
2:1 Ø, 220 V, 60 Hz
7:1 Ø, 100 V, 50/60 Hz
G:
1 Ø, 220 - 240 V, 50 Hz/1 Ø, 220 V, 60 Hz
Total Cooling Capacity in Btu/h
EX) 5 000 Btu/h ➝'05' 18 000 Btu/h ➝'18'
Combination of Inverter Type and Cooling Only or Heat Pump
N: AC Inverter and H/P V: AC Inverter and C/O
U: DC Inverter and H/P and C/O
System with Indoor Unit using R410A
❈ LGETA:U Ex) URN
Combinations of functions
A:Basic function L: Neo Plasma(Wall Mounted)
C: Plasma(Ceiling Cassette)
G: Low Static K: High Sensible Heat
U: Floor Standing without Case
SE/S8 - R: Mirror V: Silver B:Blue(ART COOL Type Panel Clolr)
SF - E: Red V: Silver G:Gold 1: Kiss (Photo changeable)
Q: Console Z: Fresh Air Intake Unit
ARN U 324 CTL 4
Limiting concentration: 0.44 kg/m3(R410A)