LG MS18AH.N50 User manual

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INSTALLATION MANUAL
AIR CONDITIONER
• 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.
P/NO : 3828A20403C
ENGLISH ITALIANO ESPAÑOL FRANÇAIS DEUTSCH

2Room Air Conditioner
Room Air Conditioner Installation Manual
TABLE OF CONTENTS
Safety Precautions............................3
Introduction........................................5
Symbols used in this manual..........5
Features ...........................................5
Installation ..........................................6
Installation parts...............................6
Installation tools ...............................6
Installation map................................7
Selecting the best location .............8
Piping length and elevation.............9
Fixing installation plate..................10
Drilling a hole in the wall ...............10
Flaring work ...................................11
Connecting the piping ..................12
Connecting the cables ..................18
Checking the drainage..................20
Forming the piping.........................21
Air purging......................................22
Test running ...................................24
Combination indoor units................26
Max Combination Capacity.............27
❏Four type "A" screws & plastic
anchors
❏Connecting cable
❏ Installation guide map
❏Pipes: Gas side
Liquid side
❏Insulation materials
❏Additional drain pipe
(Outer diameter ..............15.5mm)
❏Two type "B" screws
❏Level gauge
❏Screw driver
❏Electric drill
❏Hole core drill(ø70mm)
❏Horizontal meter
❏Flaring tool set
❏Specified torque wrenches
1.8kg.m, 4.2kg.m, 5.5kg.m,
6.6kg.m
(different depending on model No.)
❏Spanner........................Half union
❏A glass of water
❏Screw driver
❏Hexagonal wrench(4mm)
❏Gas-leak detector
❏Vacuum pump
❏Gauge manifold
❏Owner's manual
❏Thermometer
❏Remote control holder
Installation
Requirements Required Parts Required Tools

Installation Manual 3
ENGLISH
Safety Precautions
To prevent the injury of the user or other people and property damage, the following instructions
must be followed.
■Be sure to read before installing the air conditioner.
■Be sure to observe the cautions specified here as they include important items related to safety.
■Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.
■The meanings of the symbols used in this manual are as shown below.
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.
Safety Precautions
Do not disassemble or repair the product.
• Contact your dealer or service center.
Always earth the product.
• It will cause fire or electric shock.
Do not handle the flamable gas or explosive
materials near the product.
• Otherwise, it may cause fire or failure of
product.
Do not install where flamable gas could
leak.
• Otherwise, it may cause esplosion or fire.
Do not install the product on an defected
installation stand.
• Otherwise, It may cause injury or accident.
Be cautious when unpack and install the
product.
• Sharp edges could cause injury.
For electric work, contact the dealer or
service center.
• Otherwise, It will cause fire or electric shock.
Do not use damaged power cable.
• It will cause fire or electric shock.
For installation, always contact the dealer or
service center.
• Otherwise, it may cause fire, electric shock,
explosion or injury."
Do not install the product on an defected
installation stand.
• Otherwise, It may cause injury or accident

4Room Air Conditioner
Safety Precautions
If strange sound, smell or smoke come from
product, turn the breaker off or disconnect
the power supply cable.
• Otherwise, it may cause electric shock or fire.
Do not put the heater, etc. near the power
cable.
• Otherwise, it may cause fire and electric shock.
Cover the electric part.
• Otherwise, it may cause fire or electric shock.
Do not turn the breaker on/off or
connect/disconnect the power supply plug
during operation.
• Otherwise, it may cause fire or electric shock.
Do not open the suction inlet of the product
during operation.
• Otherwise, it may cause electric shock or
failure.
Do not touch the metal parts of the product
when removing the air filter.
• Otherwise, it may cause personal injury.
Always inspect gas leakage after
installation and repair of product.
• Otherwise, it may cause failure of product.
Install the drain hose to ensure that drain
can be securely done.
• Otherwise, it may cause water leakage.
Keep the level even in installing the
product.
• Otherwise, it may cause vibration or water
leakage.
Do not install the product where the noise
or hot wind from the outdoor unit could
give any casualty to the neighborhood
• Otherwise, it may cause dispute with the
neighborhoods.
Do not step or put anyting on the product.
• Otherwise, it may cause personal injury and
failure of product.
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.
Otherwise, it may cause fire or explosion.
• There is the risk of death, injury, fire or explosion.
Always intstall an circuit breaker and main
breaker.
• No installation may cause fire and electric
shock.
Do not touch(operate) product with wet
hands.
• Otherwise, it may cause fire or electric shock.

Installation Manual 5
ENGLISH
Introduction
This symbol alerts you to the risk of electric shock.
This symbol alerts you to hazards that may cause harm to
the air conditioner.
This symbol indicates special notes.
NOTICE
Introduction
Symbols used in this Manual
Features
Air Outlet
Air Intake
(side, rear)
Connection pipe
Drain hose
Connecting wire
Control cover
Air Intake Vents
Air Outlet Vents
Base Plate
Base Plate
Connection pipe
Drain hose
Connecting wire
Control cover
Air Inlet
Air Filter
Front Panel
Signal Receptor

6Room Air Conditioner
Installation
Type "A" screw (6 EA) Type "A" screw (8 EA)
Type "B" screw Type "B" screw
Remote control holderRemote control holder
Type 1 Type 2
Installation plate Installation plate
Figure FigureName
Screw driver
Electric drill
Measuring tape, Knife
Hole core drill
Spanner
Torque wrench
Ohmmeter
Hexagonal wrench
Ammeter
Gas-leak detector
Thermometer,
Horizontal meter
Flaring tool set
Name
Installation Parts
Installation Tools
Installation
Read carefully, and then follow step by step.

Installation Manual 7
ENGLISH
Installation
Installation Map
Installation parts you should purchase.
Vertical Air deflector
Air Discarge
Forced Operation Button
Operation Indication Lamps/
Signal Receptor Vinyl tape (Wide)
•Apply after carrying out a
drainage test.
•To carry out the drainage
test, remove the air filters
and pour water into the heat
exchanger.
Saddle
Gas side piping (Optional Parts)
Liquid side piping (Optional Parts)
Additional drain pipe
Vinyl tape (Narrow)
Drain Hose
Base Plate
Connecting cable
(Optional Parts)
Installation plate
Sleeve
Bushing-Sleeve
Putty(Gum Type Sealer)
Bend the pipe as closely
on the wall as possible,
but be careful that it
doesn't break.
NOTICE
Air Outlet Vents
Air Inlet Vents

8Room Air Conditioner
Installation
Indoor unit
1. Do not have any heat or steam near the unit.
2. Select a place where there are no obstacles
in front of the unit.
3. Make sure that condensation drainage can be
conveniently routed away.
4. Do not install near a doorway.
5. Ensure that the interval between a wall and
the left (or right) of the unit is more than
50cm. The unit should be installed as high as
possible on the wall, allowing a minimum of
10cm from ceiling.
6. Use a stud finder to locate studs to prevent
unnecessary damage to the wall.
Outdoor unit
1. If an awning is built over the unit to prevent
direct sunlight or rain exposure, make sure
that heat radiation from the condenser is not
restricted.
2. Ensure that the space around the back and
sides is more than 10cm. The front of the unit
should have more than 70cm of space.
3. Do not place animals and plants in the path
of the warm air.
4. Take the weight of the air conditioner into
account and select a place where noise and
vibration are minimum.
5. Select a place where the warm air and noise
from the air conditioner do not disturb
neighbors.
Rooftop Installations:
If the outdoor unit is installed on a roof
structure, be sure to level the unit. Ensure the
roof structure and anchoring method are
adequate for the unit location. Consult local
codes regarding rooftop mounting.
Select the best Location
More than 10cm
More than
5cm
More than 2.3m
More than
5cm
Install the indoor unit on the wall where the height from the floor is more than 2 meters.
more than
70cm
more than
30cm
more than
30cm
more than
20cm
more than
20cm
more than
70cm

Installation Manual 9
ENGLISH
Installation
h2
h1 h1
AABranch Pipe
Main Pipe
Distributor
Distributor
BB
h2
Multi Piping Type Distributor Type
Multi Piping Type (m)Indoor Pipe Size
Distributor Type (m)
Piping length and elevation
14k/16k 30 20 15 7.5
18k 40 25 15 7.5
24k 50 25 15 7.5
30k 70 25 15 7.5
Capacity
(Btu/h)
Total
Length
Max
Length(A/B)
Max Elevation
(h1)
In - In Elevation
(h2)
7k, 9k, 12k 3/8" 1/4"
18k, 24k 1/2" 1/4"
Capacity
(Btu/h)
Pipe Size
GAS LIQUID
40k 100 50 50 15 30 10
48k 110 50 60 15 30 10
56k 120 50 70 15 30 10
Capacity
(Btu/h) Total Length
Max Main Pipe
Length (A/B)
Total Branch
Pipe Length
Max Branch
Pipe Length
Max Elevation
(h1)
In - In Elevation
(h2)
CAUTION: Capacity is based on standard length and maximum allowance
length is on the basis of reliability. Oil trap should be installed every 5~7
meters.

10 Room Air Conditioner
Installation
The wall you select should be strong and
solid enough to prevent vibration
1. Mount the installation plate on the wall with
type "A" screws. If mounting the unit on a
concrete wall, use anchor bolts.
•Mount the installation plate horizontally by
aligning the centerline using a level.
2. Measure the wall and mark the centerline.
It is also important to use caution
concerning the location of the installation
plate-routing of the wiring to power outlets
is through the walls typically. Drilling the
hole through the wall for piping
connections must be done safely.
Fixing Installation Plate
Chassis
Hook
Installation Plate
Type “A”
Installation plate
Left rear piping Right rear piping
Ø70mm
Ø70mm
DB
A
C
•Drill the piping hole with a ø70mm hole core
drill. Drill the piping hole at either the right or
the left with the hole slightly slanted to the
outdoor side.
Drill a Hole in the Wall
5-7mm
(3/16"~5/16")
Indoor
WALL
Outdoor
ABCD
S4 55 105 65 105
SE 70 110 90 110
S5/S8 100 122 240 122
CHASSIS
(Grade)
Distance (mm)
<Type 1>
<Type 1>
<Type 1>
Installation plate
Left rear piping Right rear piping
Ø70mm
133mm
Ø70mm
100mm
<Type 2>
Chassis
Hook
Installation Plate
Type “A”
<Type 2>

Installation Manual 11
ENGLISH
Installation
Flaring Work
Main cause for gas leakage is due to defect in flaring work. Carry out correct flaring work in the
following procedure.
Cut the pipes and the cable.
1. Use the piping kit accessory or the pipes
purchased locally.
2. Measure the distance between the indoor and
the outdoor unit.
3. Cut the pipes a little longer than measured
distance.
4. Cut the cable 1.5m longer than the pipe length.
Burrs removal
1. Completely remove all burrs from the cut cross
section of pipe/tube.
2. Put the end of the copper tube/pipe in a
downward direction as you remove burrs in
order to avoid dropping burrs into the tubing.
Putting nut on
•Remove flare nuts attached to indoor and
outdoor unit, then put them on pipe/tube having
completed burr removal.
(not possible to put them on after flaring work)
Flaring work
1. Firmly hold copper pipe in a die in the dimension
shown in the table below.
2. Carry out flaring work with the flaring tool.
Copper
pipe
90°Slanted Uneven Rough
Pipe
Reamer
Point down
Flare nut
Copper tube
mm inch mm
Ø6.35 1/4 0~0.5
Ø9.52 3/8 0~0.5
Ø12.7 1/2 0~0.5
Ø15.88 5/8 0~1.0
Ø19.05 3/4 1.0~1.3
Outside diameter A
Bar
Copper pipe
Clamp handle Red arrow mark
Cone
Yoke
Handle
Bar
"A"

12 Room Air Conditioner
Installation
Check
1. Compare the flared work with the figure by.
2. If a flared section is defective, cut it off and
do flaring work again.
Indoor
1. Prepare the indoor unit's piping and drain hose for installation through the wall.
2. Remove the plastic tubing retainer(see the
illustration by) and pull the tubing and drain
hose away from chassis.
3. Replace only the plastic tubing holder 1, not
the holder 2 in the original position.
1. Route the indoor tubing and the drain hose in
the direction of rear right.
2.
Insert the connecting cable into the indoor unit
from the outdoor unit through the piping hole.
•Do not connect the cable to the indoor unit.
•Make a small loop with the cable for easy
connection later.
3. Tape the tubing, drain hose, and the
connecting cable. Be sure that the drain hose
is located at the lowest side of the bundle.
Locating at the uper side can cause drain pan
to overflow inside the unit.
If the drain hose is routed inside the room,
insulate the hose with an insulation material*
so that dripping from "sweating"(condensation)
will not damage furniture or floors.
*Foamed polyethylene or equivalent is
recommended.
Inclined
Inside is shiny without scratches
Smooth all round
Even length
all round
Surface
damaged Cracked Uneven thickness
= Improper flaring =
Connecting the Piping
For right rear piping
Drain hose
Connecting
pipe
Connecting cable
Tape
Drain hose

Installation Manual 13
ENGLISH
Installation
4. Indoor unit installation
Hook the indoor unit onto the upper portion of
the installation plate.(Engage the two hooks
of the rear top of the indoor unit with the
upper edge of the installation plate.) Ensure
that the hooks are properly seated on the
installation plate by moving it left and right.
Press the lower left and right sides of the unit
against the installation plate until the hooks
engage into their slots(clicking sound).
Connecting the piping to the indoor unit and
drain hose to drain pipe.
1. Align the center of the pipes and sufficiently
tighten the flare nut by hand.
2. Tighten the flare nut with a wrench.
3. When extending the drain hose at the indoor
unit, install the drain pipe.
Wrap the insulation material around the
connecting portion.
1. Overlap the connection pipe insulation
material and the indoor unit pipe insulation
material. Bind them together with vinyl tape
so that there may be no gap.
2. Wrap the area which accommodates the rear
piping housing section with vinyl tape.
3. Bundle the piping and drain hose together by
wrapping them with vinyl tape for enough to
cover where they fit into the rear piping
housing section.
Drain hose
Connecting
cable
Indoor unit tubing Flare nut Pipes
Wrench
Indoor unit tubing
Open-end wrench (fixed)
Connection pipe
Flare nut
Vinyl tape(narrow)
Adhesive
Drain pipe
Indoor unit drain hose
Plastic bands Insulation material
Vinyl tape(narrow)
Connection pipe
Connecting cable
Vinyl tape (wide) Wrap with vinyl tape
Indoor unit pipe
Pipe
Wrap with vinyl tape
Drain hose
Pipe
Vinyl tape(wide)
mm inch kg.m
Ø6.35 1/4 1.8
Ø9.52 3/8 4.2
Ø12.7 1/2 5.5
Ø15.88 5/8 6.6
Outside diameter Torque

14 Room Air Conditioner
Installation
1. Route the indoor tubing and the drain hose to
the required piping hole position.
2. Insert the piping, drain hose, and the
connecting cable into the piping hole.
3.
Insert the connecting cable into the indoor unit.
•Don't connect the cable to the indoor unit.
•Make a small loop with the cable for easy
connection later.
4. Tape the drain hose and the connecting
cables.
5. Indoor unit installation
•Hang the indoor unit from the hooks at the
top of the installation plate.
•Insert the spacer etc. between the indoor
unit and the installation plate and separate
the bottom of the indoor unit from the wall.
Connecting the piping to the indoor unit and
the drain hose to drain pipe.
1. Align the center of the pipes and sufficiently
tighten the flare nut by hand.
2. Tighten the flare nut with a wrench.
3. When extending the drain hose at the indoor
unit, install the drain pipe.
For left rear piping
Drain pipe
Connecting
cable
1 2
Installation plate
Spacer
Indoor unit
8cm
Indoor unit tubing Flare nut Pipes
Wrench
Indoor unit tubing
Connection pipe
Flare nut
Open-end wrench (fixed)
Vinyl tape
Adhesive
Drain hose
Indoor unit drain hose
(narrow)
mm inch kg.m
Ø6.35 1/4 1.8
Ø9.52 3/8 4.2
Ø12.7 1/2 5.5
Ø15.88 5/8 6.6
Outside diameter Torque

Installation Manual 15
ENGLISH
Installation
Wrap the insulation material around the
connecting portion.
1. Overlap the connection pipe heat insulation
and the indoor unit pipe heat insulation
material. Bind them together with vinyl tape
so that there may be no gap.
2. Wrap the area which accommodates the rear
piping housing section with vinyl tape.
3. Bundle the piping and drain hose together by
wrapping them with cloth tape over the range
within which they fit into the rear piping
housing section.
Reroute the pipings and the drain hose
across the back of the chassis.
Indoor unit installation
1. Remove the spacer.
2. Ensure that the hooks are properly seated on
the installation plate by moving it left and
right.
3. Press the lower left and right sides of the unit
against the installation plate until the hooks
engage into their slots(clicking sound).
Plastic bands Insulation material
Vinyl tape(narrow)
Connection
pipe
Connecting cable
Indoor
unit piping
Pipe
Vinyl tape
(wide) Wrap with vinyl tape
Drain hose Vinyl tape(narrow)
Pipe
Wrap with
vinyl tape(wide)
Piping for
passage through
piping hole
Drain hose
Connecting
cable

16 Room Air Conditioner
Installation
Installation Information. For left piping. Follow the instruction below.
Good case
•Press on the upper side of clamp and unfold the tubing to downward slowly.
Bad case
•Following bending type from right to left may cause damage to the tubing.

Installation Manual 17
ENGLISH
Installation
Outdoor
Align the center of the pipings and sufficiently
tighten the flare nut by hand.
Finally, tighten the flare nut with torque wrench
until the wrench clicks.
•When tightening the flare nut with torque
wrench, ensure the direction for tightening
follows the arrow on the wrench.
Gas side piping
Liquid side piping
Torque wrench
B-UNIT
A-UNIT
Outdoor unit
Outside diameter Torque
mm inch kg.m
Ø6.35 1/4 1.8
Ø9.52 3/8 4.2
Ø12.7 1/2 5.5
Ø15.88 5/8 6.6
Ø19.05 3/4 6.6

18 Room Air Conditioner
Installation
Connect the cable to the indoor unit by connecting the wires to the terminals on the control
board individually according to the outdoor unit connection. (Ensure that the color of the wires
of the outdoor unit and the terminal No. are the same as those of the indoor unit.)
The earth wire should be longer than the common wires.
The circuit diagram is not subject to change without notice.
When installing, refer to the circuit diagram behind the panel front of Indoor Unit the wiring
diagram on the Control Cover Inside Outdoor Unit.
Connect the cable to the Indoor unit.
•The circuit diagram is not subject to change without notice.
•Be sure to connect wires according to the wiring diagram.
•Connect the wires firmly, so that not to be pulled out easily.
Provide a circuit breaker between
power source and the unit as shown
below.
The power cord connected to the outdoor unit should be complied with the following
specifications (Cable type approved by HAR or SAA).
The power connecting cable connected to the indoor and outdoor unit should be
complied with the following specifications (Type "B" approved by HAR or SAA).
Air
Conditioner
Main power source
Circuit Breaker
Use a circuit breaker
or time delay fuse.
GN/YL 20mm
14k 18k 24k 30k 40k 48k 56k
2.5 2.5 2.5 3.5 5.5 5.5 5.5
Cable Type H05RN-F
NORMAL CROSS
SECTIONAL AREA
Grade
(mm2)
NORMAL
CROSS-SECTIONAL
AREA 0.75mm
2
H05VV-F
ø7.5mm
GN/YL 20mm

Installation Manual 19
ENGLISH
Installation
Connect the cable to the Outdoor unit.
1. Remove the cover control from the unit by
loosening the screw.
Connect the wires to the terminals on the
control board individually as the following.
2. Secure the cable onto the control board with
the holder (clamper).
3. Refix the cover control to the original position
with the screw.
4. Use a recongnized circuit breaker between
the power source and the unit. A
disconnection device to adequately
disconnect all supply lines must be fitted.
Circuit
Breaker
(A)
Grade (Btu/h)
7k~14k 18k 24k~28k 30k, 32k 36k, 40k 48k, 50k
15 20 30 30 40 50
Power cord
Connecting
cable
Cover control
Terminal block
Outdoor unit
Over 5mm
Holder for
power supply
cord
Loosen terminal screw
Terminal block
After the confirmation of the above conditions, prepare the wiring as follows.
1. Never fail to have an individual power circuit specifically for the air conditioner. As
for the method of wiring, be guided by the circuit diagram posted on the inside of
control cover.
2. Firmly tighten the terminal screws to prevent them loosening. After tightening, pull
the wires lightly to confirm that they do not move. (If they are loose the unit, the unit
will not operate normally or it can cause burn-out of the wires.)
3. Specification of power source.
4. Confirm that electrical capacity is sufficient.
5. See to that the starting voltage is maintained at more than 90 percent of the rated
voltage marked on the name plate.
6. Confirm that the cable thickness is as specified in the power source specification.
(Particularly note the relation between cable length and thickness.
7. Do not install an earth leakage circuit breaker in a wet or moist area.
8. The following would be caused by voltage drop.
•Vibration of a magnetic switch, which will damage the contact point, fuse breaking,
disturbance of the normal function of the overload.
9. The means for disconnection from a power supply shall be incorporated in the fixed
wiring and have an air gap contact separation of at least 3mm in each active(phase)
conductors.

20 Room Air Conditioner
Installation
Checking the drainage
To check the drainage.
1. Pour a glass of water on the evaporator.
2. Ensure the water flows through the drain
hose of the indoor unit without any leakage
and goes out the drain exit.
Drain piping
1. The drain hose should point downward for
easy drain flow.
2. Do not make drain piping.
Downward slope
Do not raise Accumulated
drain water Tip of drain hose
dipped in water
Air
Waving
Water
leakage
Water
leakage Ditch
Less than
50mm gap
Water
leakage