LG LMNC126LRL0 User manual

ENGLISH ESPAÑOL
LG
Air Conditioner
INSTALLATION MANUAL
LG
website http://www.lgservice.com
e-mail http://www.lgeservice.com/techsup.html
IMPORTANT
• Please read this installation manual completely before
installing the product.
• When the power cord is damaged, replacement work shall
be performed by authorized personnel only.
• Installation work must be performed in accordance with
the national wiring standards by authorized personnel
only.

2Room Air Conditioner
Multi Air Conditioner Installation Manual
TABLE OF CONTENTS
The following should be
always observed for
safety................................4~6
Installation of Indoor,
Outdoor Unit....................7~9
Flaring work and piping
connection...................10~14
Connecting the Cable
between Indoor Unit and
Outdoor Unit................15~16
CheckingtheDrainageand
Forming the Pipings ...17~18
Vacuum ........................19~20
Test running.......................21
Installation
Requirements Required Parts Required Tools
❏Installation guide map
❏Four Type “A” screws & plastic
anchors
❏Connecting cable
❏Level gauge
❏Screw driver
❏Electric drill
❏Hole core drill (ø50mm)
❏Horizontal meter
❏Pipes: Gas side..........1/2", 3/8"
Liquid side................1/4"
(Refer to page 7)
❏Insulation materials
❏Additional drain pipe
(Inner Diameter..............20mm)
❏Flaring Tools set
❏Specifiedtotorquewrenches
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
❏Two type "B" screws ❏Owner's manual
❏Thermometer
❏Holder Remote Control

Installation Parts Provided
Installation Manual 3
ENGLISH
Installation Parts Provided
Type "A" screws and plastic anchors
Type "B" screws Holder Remote Control
Installation plate
Standard Type
(Side)
(Rear)
Air intake
vents
Air outlet vents
Piping
Drain hose
Control cover
Connecting wire
(Side)
(Rear)
Air intake
vents
Air outlet vents
Piping
Drain hose
Control cover
Connecting wire
48K Btu/h
60K Btu/h

4Room Air Conditioner
Safety Precautions
Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions
must be followed.
■ Incorrect operation due to ignoring instruction will cause harm or damage.The
seriousness is classified by the following indications.
■Meanings 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.
WARNING
Be sure not to do.
Be sure to follow the instruction.
■Installation
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.
Do not use a defective or
underrated 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.

ENGLISH
Installation Manual 5
Safety Precautions
Do not modify or extend the power cable.
•There is risk of fire or electric shock.
Be cautious when unpacking and installing the
product.
• Sharp edges could cause injury. Be especially
careful of the case edges and the fins on the
condenser and evaporator.
For installation, always contact the dealer or an
Authorized 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 injury.
Do not let the air conditioner run for a long time when
thehumidityisveryhighandadoororawindowis
left open.
•Moisture may condense and wet or damage
furniture.
Do not store or use flammable gas or combustibles
near the product.
•There is risk of fire or failure of product.
■Operation
Gasolin

6Room Air Conditioner
Safety Precautions
Always check for gas (refrigerant) leakage after
installation or repair 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 product 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 people to lift and transport the
product.
•Avoid personal injury.
Do not install the product where it will be
exposed to sea wind (salt spray) directly.
•It may cause corrosion on the product.
Corrosion, particularly on the condenser and
evaporator fins, could cause product
malfunction or inefficient operation.
CAUTION
90°
■Installation

Installation Manual 7
ENGLISH
Installation of Indoor, Outdoor Unit
Installation of Indoor, Outdoor Unit
Read completely, then follow step by step.
Indoor unit
1. Do not have any heat or steam near the unit.
2.Selectaplacewheretherearenoobstacles
infrontoftheunit.
3. Make sure that condensation drainage can be
conveniently routed away.
4. Do not install near a doorway.
5. Ensure the spaces indicated by arrows from
the wall, ceiling, fence or other obstacles.
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 spaces indicated by arrows
around front, back and side of the unit.
3. Do not place animals and plants in the path
of the warm air.
4.Take the air conditioner weight into account
and select a place where noise and vibration
are minimum.
5. Select a place so that 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 5cm
More than
5cm
More than 2.3m More than
5cm
More than 120cm
More than
90cm
More than 90cm
More than 90cm
More than
90cm
Fence or
obstacles
Fence or
obstacles
Fence or
obstacles
CAUTION: Install the indoor unit
on the wall where the height from
thefloorsmorethan2.3meters.

8Room Air Conditioner
Installation of Indoor, Outdoor Unit
Multi Piping Type (m)
Piping length and elevation
48k 15+15=30 30 10 10
60k 15+15=30 30 10 10
Outdoor Capacity
(Btu/h) Total Length (m) Max Length(A/B) (m) Max Elevation (h1) (m)
In - In Elevation (h2)
(m)
12k 1/2" 1/4" 7.5 30
24k 5/8" 3/8" 7.5 30
Indoor Capacity
(Btu/h)
Pipe Size
Gas Liquid
Standard Length Additional Refrigerant
(m) (g/m)
h2
h1
A
B
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.

Installation Manual 9
ENGLISH
Installation of Indoor, Outdoor Unit
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.
How to fix installation plate
Installation Plate
Type "A" screw
Installation plate
Ø70mm
Left rear piping Right rear piping
C
D
B
AØ70mm
(SR, ST)
SR(9k~12k) 0 40 20 40
ST(18k~24k) 105 0 210 0
CHASSIS (Grade) Distance (mm)
ABCD

10 Room Air Conditioner
Flaring Work Piping Connection
Flaring Work Piping Connection
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
•Carry out flaring work using flaring tool as shown
below.
•Firmly hold copper pipe in a die in the dimension
showninthetableabove.
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
Outside diameter A
Bar
Copper pipe
Clamp handle Red arrow mark
Cone
Yoke
Handle
Bar
"A"

Installation Manual 11
ENGLISH
Flaring Work Piping Connection
Check
1. Compare the flared work with figure below.
2. If flare is noted to be defective, cut off the
flared section and do flaring work again.
Preparing the indoor unit's piping and drain hose for installation through the wall.
1. Route the indoor tubing and the drain hose in
the direction of rear left or right
2.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 upper side can cause drain
pan to overflow inside the unit.
Inclined
Inside is shiny without scratches
Smooth all round
Even length
all round
Surface
damaged Cracked Uneven thickness
= Improper flaring =
Connection of piping - Indoor
Drain hose
Connecting
cable
Loop
Gas side
piping
Liquid side
piping
Drain hose
CAUTION: If the drain hose is
routed inside the room, insulate
thehosewithaninsulation
material* so that dripping from
"sweating"(condensation) will not
damage furniture or floors.
*Foamed polyethylene or
equivalent is recommended.

12 Room Air Conditioner
Flaring Work Piping Connection
Indoor unit installation
1. 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 pipings to the indoor
unit and drain hose to drain pipe
1. Align the center of the pipings 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 is no gap.
2.Wrap the area which accommodates the rear
piping housing section with vinyl tape.
Drain hose
Connecting
cable
Indoor unit tubing Flare nut Pipings
Torque wrench
Indoor unit tubing
Spanner (fixed)
Connection pipe
Flare nut
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
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

Installation Manual 13
ENGLISH
Flaring Work Piping Connection
3. Bundle the piping and drain hose together by
wrapping them with vinyl tape over the range
within which they fit into the rear piping
housing section.
Wrap with vinyl tape
Drain hose
Pipe
Vinyl tape(wide)
CAUTION: Installation Information (For right piping)
For right 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 left to right could cause problem of pipe damage.

14 Room Air Conditioner
Flaring Work Piping Connection
❈When piping installation work, following
indoor units must be used the connector
whichisineachindoorunit.
Align the center of the piping 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
following the arrow on the wrench.
A-UNIT
B-UNIT
C-UNIT
Gas side piping
Liquid side piping
Torque wrench
Outdoor unit
Connection of piping - Outdoor
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
Indoor Capacity
(Btu/h) 24K
Liguid Side Ø6.35 →Ø9.52
Gas Side Ø12.7 →Ø15.88

Installation Manual 15
ENGLISH
Connecting the Cable between Indoor Unit and Outdoor Unit
Connecting the Cable between Indoor Unit and Outdoor Unit
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.
•When installing, refer to the circuit diagram behind the panel front of Indoor Unit.
•When installing, refer to the wiring diagram on the Control Cover Inside Outdoor Unit.
Connect the cable to the Indoor unit.
CAUTION:
•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.
•Connect the wires according to color codes by referring the wiring diagram.
CAUTION: Provide a circuit
breaker between power source
and the unit as shown below.
CAUTION: The power cord connected to the outdoor unit should comply with
the following specifications (Cable type approved by HAR or SAA).
The power connecting cable connected to the indoor and outdoor unit
should comply 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
48k 60k
8.5 8.5
Cable Type H05RN-F H05RN-F
NORMAL CROSS
SECTIONAL AREA
Grade
(mm2)
NORMAL
CROSS-SECTIONAL
AREA 0.75mm2
ø7.5mm
GN/YL 20mm

16 Room Air Conditioner
Connecting the Cable between Indoor Unit and Outdoor Unit
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)
48k
50 60K 50
Outdoor unit
CAUTION: 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 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.
Terminal on the OUTDOOR UNIT
1(L) 2(N) 3
Power cord
1(L) 2(N)
Terminal on the INDOOR UNIT
B-UNIT
1(L) 2(N) 3
Terminal on the INDOOR UNIT
A-UNIT
1(L) 2(N) 3
Terminal on the INDOOR UNIT
C-UNIT
1(L) 2(N) 3
3 1(L) 32(N)
■48K Btu/h
Terminal on the OUTDOOR UNIT
1(L) 3(D)2(N) 3(A)
Power cord
1(L) 2(N)
Terminal on the INDOOR UNIT
B-UNIT
1(L) 2(N) 3
Terminal on the INDOOR UNIT
A-UNIT
1(L) 2(N) 3
Terminal on the INDOOR UNIT
C-UNIT
1(L) 2(N) 3
Terminal on the INDOOR UNIT
D-UNIT
1(L) 2(N) 3
3(B) 2(N) 3(C)1(L)
■60K Btu/h

Installation Manual 17
ENGLISH
Checking the Drainage and Forming the Pipings
Checking the Drainage and Forming the Pipings
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

18 Room Air Conditioner
Checking the Drainage and Forming the Pipings
Form the piping
Form the piping by wrapping the
connecting portion of the indoor unit
with insulation material and secure it
with two kinds of vinyl tape.
•If you want to connect an additional drain
hose, the end of the drain outlet should be
routed above the ground. Secure the drain
hose appropriately.
In cases where the outdoor unit is
installed below the indoor unit
perform the following.
1.Tape the piping, drain hose and connecting
cablefromdowntoup.
2. Secure the tapped piping along the exterior
wall using saddle or equivalent.
In cases where the Outdoor unit is
installed above the Indoor unit
perform the following.
1.Tape the piping and connecting cable from
bottom to top.
2. Secure the taped piping along the exterior
wall. Form a trap to prevent water entering
the room.
3. Fix the piping onto the wall by saddle or
equivalent.
•Trap is required to prevent water from entering
into electrical parts.
Plastic
band
Taping
Drain hose
Pipings
Connecting
cable
Power supply
cord
Seal a small
opening around
the pipings with
gum type sealer.
Trap
Seal a small opening
around the pipings
with gum type sealer.
Trap

Installation Manual 19
ENGLISH
Test of the leakage
Test of the leakage
Air and moisture remaining in the refrigerant system have undesirable effects as indicated below.
1. Pressure in the system rises.
2. Operating current rises.
3. Cooling(or heating) efficiency drops.
4. Moisture in the refrigerant circuit may freeze and block capillary tubing.
5.Water may lead to corrosion of parts in the refrigeration system.
Therefore, the indoor/outdoor unit and connecting tube must be checked for leak tight, and
vacuumed to remove incondensible gas and moisture in the system.
Preparation
•Check that each tube(both liquid and gas side
tubes) between the indoor and outdoor units have
been properly connected and all wiring for the test
run has been completed. Remove the service
valve caps from both the gas and the liquid side
on the outdoor unit. Check that both the liquid and
the gas side service valves on the outdoor unit
are kept closed at this stage.
Leakage test
•Connect the manifold valve(with pressure gauge)
and dry nitrogen gas cylinder to this service port
withchargehoses.
CAUTION: Be sure to use a
manifold valve for leakage test. If
it is not available, use a stop valve for
this purpose.The "Hi" knob of the
manifold valve must always be kept
close.
•Pressurize the system to no more than 150
P.S.I.G. with dry nitrogen gas and close the
cylinder valve when the gauge reading
reached 150 P.S.I.G. Next, test for leaks with
liquid soap.
CAUTION: To avoid nitrogen
entering the refrigerant system in a
liquid state, when you pressurize the
system. Usually, the cylinder is used in a
vertical standing position.
1. Do a leakage test of all joints of the
tubing(both indoor and outdoor) and both gas
and liquid side service valves.
Bubbles indicate a leak. Be sure to wipe off
the soap with a clean cloth.
2. After the system is found to be free of leaks,
relieve the nitrogen pressure by loosening the
charge hose connector at the nitrogen
cylinder.When the system pressure is
reduced to normal, disconnect the hose from
the cylinder.
Checking method
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
Indoor unit
Outdoor unit
Lo Hi
Manifold valve
Pressure
gauge

20 Room Air Conditioner
Soap water method
1. Remove the caps from the 2-way and 3-way valves.
2. Remove the service-port cap from the 3-way valve.
3.To open the 2-way valve turn the valve stem
counterclockwise approximately 90°, wait for about
2~3 sec, and close it.
4. Apply a soap water or a liquid neutral detergent on
the indoor unit connection or outdoor unit
connections by a soft brush to check for leakage of
the connecting points of the piping.
5. If bubbles come out, the pipes have leakage
1. Connect the charge hose end described in the
preceding steps to the vacuum pump to
evacuate the tubing and indoor unit.
Confirm the "Lo" knob of the manifold valve is
open.Then, run the vacuum pump.
The operation time for evacuation varies with
tubing length and capacity of the pump.The
following table shows the time required for
evacuation.
2.When the desired vacuum is reached, close the
"Lo" knob of the manifold valve and stop the
vacuum pump.
Finishing the job
1.With a service valve wrench, turn the valve stem of
liquid side valve counter-clockwise to fully open the
valve.
2.Turn the valve stem of gas side valve counter-
clockwise to fully open the valve.
3. Loosen the charge hose connected to the gas side
service port slightly to release the pressure, then
remove the hose.
4. Replace the flare nut and its bonnet on the gas side
service port and fasten the flare nut securely with
an adjustable wrench.This process is very
important to prevent leakage from the system.
5. Replace the valve caps at both gas and liquid side
service valves and fasten them tight.
This completes air purging with a vacuum pump.
The air conditioner is now ready for test run.
Test of the leakage
Cap
Hexagonal wrench
A-UNIT
B-UNIT
C-UNIT
Gas side piping
Liquid side piping
Outdoor unit
3-way valve
(Close)
2-way valve
(Open)
2-way valve
(Open)
3-way valve
(Close)
2-way valve
(Open)
3-way valve
(Close)
Required time for evacuation when 30 gal/h vacuum
pump is used
10 min. or more 15 min. or more
If tubing length is less
than 10m (33 ft)
If tubing length is longer
than 10m (33 ft)
Indoor unit
Outdoor unit
Lo Hi
Manifold valve
Pressure
gauge
Vacuum pump
Open Close
Vacuum