LG ARNU07GM1A4 User manual

www.lg.com
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 CONCEALED DUCT
Original instruction
[ Representative ] LG Electronics Inc. EU Representative : LG Electronics European Shared
Service Center B.V. Krijgsman 1, 1186 DM Amstelveen, The Netherlands
[Manufacturer] LG Electronics Inc. Changwon 2nd factory 84, Wanam-ro, Seongsan-gu,
Changwon-si, Gyeongsangnam-do, KOREA
For more information, Refer to the CD or LG Web site (www.lg.com).
INSTALLATION MANUAL
AIR
CONDITIONER
P/NO : MFL68821901
ENGLISH ITALIANO ESPAÑOL
FRANÇAIS
DEUTSCH
ΕΛΛΗΝΙΚΆ
ČEŠTINA
NEDERLANDS
POLSKI
LIMBA ROMÂNĂ

2Indoor Unit
TABLE OF CONTENTS
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
oFlaring tool set
oSpecified torque wrenches
(different depending on model No.)
oSpanner.......Half union
oA glass of water
oHexagonal wrench
oGas-leak detector
oVacuum pump
oGauge manifold
oOwner's manual
oThermometer
Features...................................3
Safety Precautions.................4
Installation
Selection the best location....9
Ceiling opening dimension
and hanging bolt location....10
Indoor Unit Installation.........11
Wiring Connection ...............11
Checking the Drainage .......12
Indoor Unit Drain Piping......13
Dip Switch Setting ...............15
Group Control Setting .........16
Model Designation ..............21
Airborne Noise Emission ....21
Limiting concentration .........21
How to Set E.S.P?................22
Installation Requirements Required Parts Required Tools

Installation Manual 3
Feature
ENGLISH
Remote Controller
Air inlet vents
Air outlet vents
(Accessory)
Features
Name Drain hose Clamp metal
Washer for
hanging bracket
Clamp
(Tie Wrap)
Insulation for
fitting
Quantity 1 EA 2 EA 8 EA 4 EA 1 SET
Shape
(Other)
• Owner's manual
•
Installation manual
for gas pipe
for liquid pipe
Installation Tool

Safety Precautions
4Indoor Unit
Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must be
followed.
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 underrated circuit
breaker. Use this appli-
ance on a dedicated
circuit.
• There is risk of fire or
electric shock.
For electrical work,
contact the dealer,
seller, a qualified elec-
trician, or an Author-
ized 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 dedi-
cated circuit and
breaker.
• Improper wiring or in-
stallation may cause fire
or electric shock.
Use the correctly rated
breaker or fuse.
• There is risk of fire or
electric shock.
Do not modify or ex-
tend the power cable.
• There is risk of fire or
electric shock.
Do not install, remove,
or re-install the unit by
yourself (customer).
• There is risk of fire,
electric shock, explo-
sion, or injury.
Be cautious when un-
packing and installing
the product.
•
Sharp edges could cause
injury. Be especially careful
of the case edges and the
fins on the condenser and
evaporator.

Installation Manual 5
Safety Precautions
ENGLISH
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, explosion or death.
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 Flammable gases. Oth-
erwise, it may cause fire or explosion.
• There is the risk of death, injury, fire or
explosion.
For installation, always con-
tact the dealer or an Author-
ized Service Center.
• There is risk of fire,
electric shock, explo-
sion, or injury.
Do not install the prod-
uct on a defective in-
stallation stand.
• It may cause injury, ac-
cident, or damage to the
product.
Be sure the installation
area does not deterio-
rate with age.
•
If the base collapses, the
air conditioner could fall
with it, causing property
damage, product failure,
and personal injury.
nOperation
Do not let the air condi-
tioner 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 fur-
niture.
Take care to ensure
that power cable could
not be pulled out or
damaged during oper-
ation.
• There is risk of fire or
electric shock.
Do not place anything
on the power cable.
• There is risk of fire or
electric shock.
Do not plug or unplug
the power supply plug
during operation.
• There is risk of fire or
electric shock.
Do not touch(operate)
the product with wet
hands.
• There is risk of fire or
electrical shock.
Do not place a heater
or other appliances
near the power cable.
• There is risk of fire and
electric shock.
Do not allow water to
run into electric parts.
•
It may cause There is
risk of fire, failure of the
product, or electric shock.
Do not store or use
flammable gas or com-
bustibles near the
product.
• There is risk of fire or
failure of product.
Do not use the product
in a tightly closed
space for a long time.
• Oxygen deficiency could
occur.

Safety Precautions
6Indoor Unit
Ventilate the product
from time to time when
operating it together
with a stove, etc.
• There is risk of fire or
electric shock.
Turn the main power
off when cleaning or
maintaining the prod-
uct.
• There is risk of electric
shock.
When the product is
not be used for a long
time, disconnect the
power supply plug or
turn off the breaker.
• There is risk of product
damage or failure, or
unintended operation.
Take care to ensure that nobody could step on or fall onto the outdoor
unit.
• This could result in personal injury and product damage.
When flammable gas
leaks, turn off the gas
and open a window for
ventilation before turn
the product on.
• Do not use the tele-
phone or turn switches
on or off. There is risk of
explosion or fire.
If strange sounds, or
small or smoke comes
from product. Turn the
breaker off or discon-
nect the power supply
cable.
• There is risk of electric
shock or fire.
Stop operation and
close the window in
storm or hurricane.
If possible, remove the
product from the win-
dow before the hurri-
cane arrives.
• There is risk of property
damage, failure of prod-
uct, or electric shock.
Do not open the inlet
grill of the product dur-
ing operation.
(Do not touch the elec-
trostatic filter, if the
unit is so equipped.)
• There is risk of physical
injury, electric shock, or
product failure.
When the product is
soaked (flooded or
submerged), contact
an Authorized Service
Center.
• There is risk of fire or
electric shock.
Be cautious that water
could not enter the
product.
• There is risk of fire,
electric shock, or prod-
uct damage.

Installation Manual 7
Safety Precautions
ENGLISH
Always check for gas
(refrigerant) leakage
after installation or re-
pair of product.
• Low refrigerant levels
may cause failure of
product.
Install the drain hose
to ensure that water is
drained away properly.
• A bad connection may
cause water leakage.
Keep level even when
installing the product.
• To avoid vibration or
water leakage.
Do not install the prod-
uct where the noise or
hot air from the outdoor
unit could damage the
neighborhoods.
• It may cause a problem
for your neighbors.
Use two or more peo-
ple to lift and transport
the product.
• Avoid personal injury.
Do not install the prod-
uct where it will be ex-
posed to sea wind (salt
spray) directly.
• It may cause corrosion
on the product. Corro-
sion, particularly on the
condenser and evapora-
tor fins, could cause
product malfunction or
inefficient operation.
CAUTION
nInstallation
nOperation
Do not expose the skin
directly to cool air for
long periods of time.
(Don't sit in the draft.)
• This could harm to your
health.
Do not use the product
for special purposes,
such as preserving
foods, works of art, etc.
It is a consumer air con-
ditioner, not a precision
refrigeration system.
• There is risk of damage
or loss of property.
Do not block the inlet
or outlet of air flow.
• It may cause product
failure.

Safety Precautions
8Indoor Unit
Use a soft cloth to
clean. Do not use
harsh detergents, sol-
vents, etc.
• There is risk of fire,
electric shock, or dam-
age to the plastic parts
of the product.
Do not touch the metal
parts of the product when
removing the air filter.
They are very sharp!
• There is risk of personal
injury.
Do not step on or put
anyting on the product.
(outdoor units)
• There is risk of personal
injury and failure of
product.
Always insert the filter
securely. Clean the filter
every two weeks or
more often if necessary.
• A dirty filter reduces the
efficiency of the air condi-
tioner and could cause
product malfunction or
damage.
Do not insert hands or
other objects through the
air inlet or outlet while the
product is operated.
• There are sharp and
moving parts that could
cause personal injury.
Do not drink the water
drained from the prod-
uct.
• It is not sanitary and
could cause serious
health issues.
Use a firm stool or lad-
der when cleaning or
maintaining the prod-
uct.
• Be careful and avoid
personal injury.
Replace the all batteries in
the remote control with
new ones of the same
type. Do not mix old and
new batteries or different
types of batteries.
• There is risk of fire or
explosion.
Do not recharge or dis-
assemble the batteries.
Do not dispose of bat-
teries in a fire.
• They may burn or ex-
plode.
If the liquid from the batteries gets
onto your skin or clothes, wash it well
with clean water. Do not use the re-
mote if the batteries have leaked.
• The chemicals in batteries could
cause burns or other health hazards.
If you eat the liquid from the batter-
ies, brush your teeth and see doc-
tor. Do not use the remote if the
batteries have leaked.
• The chemicals in batteries could
cause burns or other health hazards.

Installation Manual 9
Installation
Install the air conditioner in the location that satisfies the following conditions.
• The place shall easily bear a load exceeding four times the indoor unit’s weight.
• The place shall be able to inspect the unit as the figure.
• The place where the unit shall be leveled.
•
The place shall allow easy water drainage.
• The place shall easily connect with the outdoor unit.
• The place where the unit is not affected by an electrical noise.
• The place where air circulation in the room will be good .
• There should not be any heat source or steam near the unit.
Read completely, then follow step by step.
Front view (Unit: mm)
(Unit: mm)
Top view
Front
Inspection hole(1)
600 x 600
Inspection hole(2)
600 x 600
Control box
1000
Air outlet vents
Air inlet vents
600 600
More than 20
ENGLISH
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.
[Inspection Hole Standard]
Number of
inspection hole
Distance between
false ceiling & actual ceiling
Remarks
1 More than 100cm Sufficient space in the ceiling for servicing.
2 20cm to 100cm Insufficient space. Difficult for servicing
Hole size should be more
than the size of IDU.
Less than 20cm Minimum height for motor replacement.

10 Indoor Unit
Installation
nInstallation of Unit
Install the unit above the ceiling correctly.
• Apply a joint-canvas between the unit and duct
to absorb unnecessary vibration.
• Install the unit leaning to a drainage hole side
as a figure for easy water drainage.
• A place where the unit will be leveled and that
can support the weight of the unit.
•
A place where the unit can withstand its vibration.
• A place where service can be easily performed.
POSITION OF SUSPENSION BOLT
C
E
G
D
F
I
A
J
B
H
Drain hole
M10 Nut
M10 washer
X 4
X 4
M10 Nut
M10 washer
X 4
X 8
• Throughly study the following installation locations:
1.
In such places as restaurants and kitchens, considerable amount of oil steam and flour adhere to the fan, the fin of the heat ex-
changer, resulting in heat exchange reduction, spraying, dispersing of water drops, etc. In these cases, take the following actions:
• Make sure that the ventilation fan for smoke-collecting hood on a cooking table has sufficient capacity so that it draws oily
steam which should not flow into the suction of the air conditioner.
• Make enough distance from a cooking room to install the air conditioner in such a place where it may not suck in oil steam.
2. Avoid installing air conditioner in such circumstances where cutting oil mist or iron powder is in suspension in factories, etc.
3. Avoid places where inflammable gas is generated, flows in, is stored or vented.
4. Avoid places where sulfurous acid gas or corrosive gas is generated.
5. Avoid places near high frequency generators.
NOTICE
Ceiling dimension and hanging bolt location
(Unit:mm)
Dimension A B C D E F G H I J
Chassis name
M1 933.4 971.6 619.2 700 30 270 15.2 858 201.4 900
M2 1283.4 1321.6 619.2 700 30 270 15.2 1208 201.4 1250
M3 1283.4 1321.6 619.2 700 30 360 15.2 1208 291.4 1250

Installation Manual 11
Installation
ENGLISH
• Select and mark the position for fixing bolts.
•
Drill the hole for set anchor on the face of ceiling.
• Insert the set anchor and washer onto the sus-
pension bolts for locking the suspension bolts
on the ceiling.
• Mount the suspension bolts to the set anchor firmly.
• Secure the installation plates onto the suspen-
sion bolts (adjust level roughly) using nuts,
washers and spring washers.
1 Set anchor
Old building New building
2 Plate washer
3 Spring washer
4 Nut
5 Suspension
bolts
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.
Clamping of cables
1) Arrange 2 power cables on the control panel.
2) First, fasten the steel clamp with a screw to the inner boss of control panel.
3) For the cooling model, fix the other side of the clamp with a screw strongly. For the heat pump
model, put the 0.75mm2 cable(thinner cable) on the clamp and tighten it with a plastic clamp to
the other boss of the control panel.
Terminal Block Indoor
1(L) 2(N)
Terminal Block Indoor
34
INDOOR POWER INPUT
Terminal Block Indoor
GN/YL
IDU IDU
Outdoor unit Indoor unit
Central controller
SODU SODU
DRY1 DRY2 GND INTERNET 12V
Outdoor unit
Terminal Block Indoor
1(L) 2(N)
Terminal Block Indoor
34
INDOOR POWER INPUT
GN/YL
IDU IDU
Outdoor unit Indoor unit
Central controller
SODU SODU
DRY1 DRY2 GND INTERNET 12V
Outdoor unit
Wiring Connection
Indoor Unit Installation
CAUTION : Tighten the nut and bolt
to prevent unit falling.
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.
<M1 Chassis>
<M2/M3 Chassis>

Installation
12 Indoor Unit
1. Remove the Air Filter.
2. Check the drainage.
• Spray one or two glasses of water upon the
evaporator.
• Ensure that water flows drain hose of indoor
unit without any leakage.
Air outlet vents
Air filters
Checking the Drainage
INSULATION, OTHERS Insulate the joint and tubes completely.
All thermal insulation must comply with local requirement.
INDOOR UNIT
THERMAL INSULATION
Make sure that there is no clearance here.
Overlap with thermal
insulator for piping.
Thermal insulator for refrigerant pipe
(Local supply) Thermal insulator for
piping(Local supply)
Hose clip for thermal insulator(Local supply)
Liquid pipe
Refrigerant pipe and thermal
insulation(Local supply)
Union for gas pipe
Insulation
(Local supply)
Clamp for insulation
(Local supply)

Installation Manual 13
Installation
ENGLISH
Indoor Unit Drain Piping
Ceiling
CAUTION
1~3mm
Drainage hole
Front of view
1. Install declination of the indoor unit is very important for the drain of the duct type air
conditioner.
2. Minimum thickness of the insulation for the connecting pipe shall be 5mm.
• The unit must be horizontal or declined to the drain hose connected when finished installation.
•
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 in-
door unit is 32mm.
• Be sure to install heat insulation on the drain piping.
Piping material: Polyvinyl chloride pipe inner
diometes Ø 25mm 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 exterior 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 normal opera-
tion 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
Maintenance
drain port
Upward
routing
not allowed
Pipe clamp
Indoor unit
1/50~1/100
MAX 700mm
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)
1/50~1/100 slope
Hanger
distance Hanger Bracket
Max 700mm
Flexible drain hose
Insulation
Metal
clamp
Max 300mm 1~15m
CAUTION : The supplied flexible
drain hose should not be strained.
A strained hose may cause leakage
of water.

Installation
14 Indoor Unit
CAUTION:
After the confirmation of the above conditions, prepare the wiring as follows:
1) Never fail to have an individual power specialized for the air conditioner. As
for the method of wiring, be guided by the circuit diagram posted on the inside
of control box cover.
2) Provide a circuit breaker switch between power source and the unit.
3) The screws 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) Specification of power source
5) Confirm that electrical capacity is sufficient.
6) Be sure that the starting voltage is maintained at more than 90 percent 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) Never fail to equip a leakage breaker where it is wet or moist.
9) The following troubles would be caused by voltage drop-down.
• Vibration of a magnetic switch, damage on the contact point, fuse breaking, distur-
bance by the normal function of an 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 Manual 15
Installation
ENGLISH
Dip Switch Setting
For Multi V Models, DIP switch 1, 2, 6, 8 must be set OFF.
CAUTION
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
Contact Mode
Wired/Wireless remote
controller
selection of Manual or Auto
operation Mode
Auto Off
SW5 Installation
Fan continuous
operation
Continuous operation Re-
moval
- 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 re-
gion General model Tropical model
SW8 Etc. Spare - - Off
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
16 Indoor Unit
Group Control Setting
Master
GND
Signal
12 V
LGAP Network System
Master Slave Slave Slave
Display Error Message Only connect serial signal and GND lines
between indoor units.
or
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 Manual 17
Installation
ENGLISH
GND
Signal
12 V
LGAP Network System
Master Master Slave Slave
Donʼt connect serial 12V line
or
Display Error Message
Master Slave
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
18 Indoor Unit
GND
Signal
12 V
LGAP Network System
MN
Master Slave
Display Error Message
Master FAU
Slave
FAU
Master
or
Master Master
Display Error Message
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 Manual 19
Installation
ENGLISH
LGAP Network System
Master Slave
GND
Signal
12 V
or
Display Error Message
Master Slave Slave Slave
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
20 Indoor Unit
5. Accessories for group control setting
It is possible to set group control by using below accessories.
Indoor unit 2 EA +Wired remote controller Indoor unit 1 EA +Wired remote controller 2EA
h PZCWRCG3 cable used for connection h PZCWRC2 cable used for connection
Slave
Mas te r
Maste r
PZCWRCG3
Maste r S lav e
PZCWRC2
• Apply totally enclosed noncombustible conduit in case of local building code Requiring plenum
cable usage.
CAUTION