• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
Air Conditioner Service Manual
TABLE OF CONTENTS
LG Model Name ...............................................................................................................................................3
Selection of the Best Location..................................................................................................................18
Piping Length and Elevation.....................................................................................................................18
How to Fix Installation Plate.....................................................................................................................19
Drill a Hole in the Wall..............................................................................................................................19
Connection of Piping Indoor.....................................................................................................................20
Connection of the Pipes-Outdoor.............................................................................................................24
Connecting the cable between indoor unit and outdoor unit...................................................................25
Connect the Cable to the Indoor Unit.......................................................................................................25
Connect the Cable to the Outdoor Unit ....................................................................................................26
Checking the drainage and forming the pipings........................................................................................27
Checking the Drainage.............................................................................................................................27
Form the Piping........................................................................................................................................27
AIR PURGING ................................................................................................................................................28
Air purging................................................................................................................................................28
Air purging with vacuum pump.................................................................................................................28
Test Running .................................................................................................................................................30
Function of Controls.................................................................................................................................31
Display Function ......................................................................................................................................35
Replacement Parts List ................................................................................................................................63
2Room Air Conditioner
LG Model Name
12 - 345678910
Code TypeCode of ModelMeaning
1Producing Center, A~ZL: Chang-won R22N: India
RefrigerantA: Chang-won R410AZ: Brazil
C: Chang-won R407CD: Indonesia
T: ChinaM: Mexico
K: Turkey R22V: Vietnam
E: Turkey R410AS: Out Sourcing
H: Thailand
2Product TypeA~ZS: Split Type Air Conditioner
3Cooling/Heating/InverterA~ZC: Cooling only
H: Heat pump
X: C/O + E/Heater
Z: H/P + E/Heater
V: AC Inverter C/O
N: AC Inverter H/P
Q: DC Inverter C/O
W: DC Inverter H/P
• Select a place where there are no obstacles in front of the
unit.
• Make sure that condensation drainage can be conveniently
routed away.
Do not install near a doorway.
• Ensure that the space around the left and right of the unit is
more than "A". The unit should be installed as high on the
wall as possible, allowing a minimum of "B" from ceiling.
• Use a stud finder to locate studs to prevent unnecessary
damage to the wall.
Install the indoor unit on the wall where the height
from the floors more than 2.3 meters.
Grade
5K~28K105
30K~38K3012
Clearance(cm)
AB
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.
Piping Length and Elevation
Max.
(m)
Max.
Elevation
B (m)
Capacity
(Btu/h)
5k~14k
18k~28k5/8"(Ø15.88)1/4"(Ø6.35)4 or 7.5153020
30k~38k
Pipe Size
GASLIQUID
3/8"(Ø9.52)1/4"(Ø6.35)4 or 7.571520
1/2"(Ø12.7)1/4"(Ø6.35)4 or 7.571520
1/2"(Ø12.7)1/4"(Ø6.35)4 or 7.5153020
5/8"(Ø15.88)3/8"(Ø9.52)4 or 7.5153030
5/8"(Ø15.88)3/8"(Ø9.52)7.5153030
3/4"(Ø19.05)3/8"(Ø9.52)7.5153050
Standard
Length
Length
A (m)
Additional
Refrigerant
(g/m)
Outdoor unit
• 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.
• 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.
• Do not place animals and plants in the path of the warm air.
• Take the air conditioner weight into account and select a
place where noise and vibration are minimum.
• Select a place so that the warm air and noise from the air
conditioner do not disturb neighbors.
18 Room Air Conditioner
If case more than 5m
• 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.
How to Fix Installation PlateDrill a Hole in the Wall
Installation Plate
Type "A" screw
Chassis
Hook
5-7mm
(3/16"~5/16")
Indoor
WALL
Outdoor
Installation plate
Left rear pipingRight rear piping
Ø70mm
Ø70mm
DB
A
C
Connecting
part
Adhesive
Drain
hose
Only the
desired direction
Installation
The wall you select should be strong and solid
enough to prevent vibration
1. Mount the installation plate on the wall with four
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.
• 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.
• Open the Front Grille.
• Pass Telephone Control Cord Wire through the hole
which the power cord goes through.
• Connect Telephone Control Cord Wire to the phone jack
of telephone PCB of Control Box.
• Fix Telephone Control Cord Wire inside Control box so
as not to disconnect.
• Close the Front Grille.
CHASSIS
(Grade)
7k, 9k, 12k756510565
18k, 24k1056526065
ABCD
Distance (mm)
Drain hose junction
• Remove the rubber stopple in the desired drain direction.
• Insert drain hose into the handle of drain pan, and join
drain hose and connecting hose according to the figure
by.
Service Manual 19
Flaring work and connection of piping
Bar
Copper pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Inclined
Inside is shiny without scratches
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
Drain hose
Pipe
Reamer
Point down
Flare nut
Copper tube
Flaring work and connection of piping
Flaring work
• Carry out flaring work using flaring tool as shown below.
Flaring work
Main cause for refrigerant leakage is due to defect in the
flaring work. Carry out correct flaring work using the following procedure.
Cut the pipes and the cable.
• Use the piping kit accessory or pipes purchased locally.
• Measure the distance between the indoor and the outdoor unit.
• Cut the pipes a little longer than the measured distance.
• Cut the cable 1.5m longer than the pipe length.
Copper
pipe
Slanted Uneven Rough
90°
Check
• Compare the flared work with figure below.
• If flare is noted to be defective, cut off the flared sec-
tion and re-flare it.
Burr removal
• Completely remove all burrs from the cut cross section of
pipe/tube.
• 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.
Outside diameterA
mminchmm
Ø6.351/40~0.5
Ø9.523/80~0.5
Ø12.71/20~0.5
Ø15.885/80~1.0
Ø19.053/41.0~1.3
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
• Firmly hold copper pipe in a die in the dimension shown in
the table above.
20Room Air Conditioner
Connection of piping -- Indoor
• Preparing the indoor unit's piping and drain hose for installation through the wall.
• Remove the plastic tubing retainer(see illustration below)
and pull the tubing and drain hose away from chassis.
• Replace the plastic tubing holder in the original
position.(Optional)
When install, make sure that the
remaining parts must be removed
clearly so as not to damage the piping and drain hose, especially power
cord and connecting cable.
Flaring work and connection of piping
Drain hose
Connecting
cable
Vinyl tape(narrow)
Connection
pipe
Connecting cable
Vinyl tape
(wide)
Wrap with vinyl tape
Indoor
unit pipe
Pipe
Plastic bands
Insulation material
Vinyl tape(narrow)
Adhesive
Drain pipe
Indoor unit drain hose
Wrench
Indoor unit tubing
Open-end wrench (fixed)
Connection pipe
Flare nut
Indoor unit tubingFlare nutPipes
Drain hose
Connecting
pipe
Connecting cable
Tape
Drain hose
For right rear piping
Route the indoor tubing and the drain hose in the direction of
rear right.
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.
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.
Connecting the pipings to the indoor unit and
drain hose to drain pipe.
• Align the center of the pipes and sufficiently tighten
the flare nut by hand.
• Tighten the flare nut with a wrench.
Outside diameterTorque
mminchkg.m
Ø6.351/41.8
Ø9.523/84.2
Ø12.71/25.5
Ø15.885/86.6
Ø19.053/46.6
• When extending the drain hose at the indoor unit, install the
drain pipe.
NOTE: 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.
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).
Wrap the insulation material around the connecting portion.
•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.
• Wrap the area which accommodates the rear piping hous-
ing section with vinyl tape.
Service Manual 21
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