LG ATUQ18GQSK1 User manual

INSTALLATION MANUAL
AIR
CONDITIONER
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.
P/NO.:MFL70541908
REV.00_190515
Copyright © 2016 - 2019 LG Electronics Inc. All Rights Reserved.

2TIPS FOR SAVING ENERGY
• Do not cool excessively indoors. This may be harmful to your health and may consume more elec-
tricity.
• Block sunlight with blinds or curtains while you are operating the air conditioner.
• Keep doors or windows closed tightly while you are operating the air conditioner.
• Adjust the direction of the air flow vertically or horizontally to circulate indoor air.
• Speed up the fan to cool or warm indoor air quickly, in a short period of time.
• Open windows regularly for ventilation as the indoor air quality may deteriorate if the air condition-
er is used for many hours.
• Clean the air filter once every 2 weeks. Dust and impurities collected in the air filter may block the
air flow or weaken the cooling / dehumidifying functions.
For your records
Staple your receipt to this page in case you need it to prove the date of purchase or for warranty
purposes. Write the model number and the serial number here:
Model number :
Serial number :
You can find them labeled on the side of each unit.
Dealer’s name :
Date of purchase :
Here are some tips that will help you minimize the power consumption when you use the air
conditioner. You can use your air conditioner more efficiently by referring to the instructions
below:
TIPS FOR SAVING ENERGY

IMPORTANT SAFETY INSTRUCTIONS 3
ENGLISH
IMPORTANT SAFETY INSTRUCTIONS
READ ALL INSTRUCTIONS BEFORE USING THE APPLIANCE.
Always comply with the following precautions to avoid dangerous situations and ensure peak
performance of your product
WARNING
It can result in serious injury or death when the directions are ignored
CAUTION
It can result in minor injury or product damage when the directions are ignored
WARNING
• Installation or repairs made by unqualified persons can result in hazards to you and others.
• Installation work must be performed in accordance with the National Electric Code by quali-
fied and authorized personnel only.
• The information contained in the manual is intended for use by a qualified service technician
familiar with safety procedures and equipped with the proper tools and test instruments.
• Failure to carefully read and follow all instructions in this manual can result in equipment mal-
function, property damage, personal injury and/or death.
Installation
• Always perform grounding. Otherwise, it may cause electrical shock.
• Don’t use a damaged power cable. Otherwise, it may cause a fire or electrical shock.
• For installation of the product, always contact the service center or a professional installation
agency. Otherwise, it may cause a fire, electrical shock, explosion or injury.
• Securely attach the electrical part cover to the indoor unit and the service panel to the outdoor
unit. If the electrical part cover of the indoor unit and the service panel of the outdoor unit are
not attached securely, it could result in a fire or electric shock due to dust, water, etc.
• Always install an earth leakage circuit breaker and a dedicated switching board. No installation
may cause a fire and electrical shock.
• Do not keep or use flammable gases or combustibles near the air conditioner. Otherwise, it
may cause a fire or the failure of product.
• Ensure that an installation frame of the outdoor unit is not damaged due to use for a long
time. It may cause injury or an accident.
• Do not disassemble or repair the product randomly. It will cause a fire or electrical shock.
• Use a vacuum pump or Inert (nitrogen) gas when doing leakage test or air purge. Do not com-
press air or Oxygen and do not use Flammable gases. Otherwise, it may cause fire or explo-
sion. There is the risk of death, injury, fire or explosion.
• Do not install the product at a place that there is concern of falling down. Otherwise, it may
result in personal injury.
• Use caution when unpacking and installing. Sharp edges may cause injury.
• Do not turn on the breaker or power under condition that front panel, cabinet, top cover, con-
trol box cover are removed or opened. Otherwise, it may cause fire, electric shock, explosion
or death.
!
!
!

4IMPORTANT SAFETY INSTRUCTIONS
Operation
• Do not share the outlet with other appliances. It will cause an electric shock or a fire due to
heat generation.
• Do not use the damaged power cable. Otherwise, it may cause a fire or electrical shock.
• Do not modify or extend the power cable randomly. Otherwise, it may cause a fire or electri-
cal shock.
• Take care so that the power cable may not be pulled during operation. Otherwise, it may
cause a fire or electrical shock.
• Turn off the unit if strange sounds, smell, or smoke comes from it. Otherwise, it may cause
electrical shock or a fire.
• Keep the flames away. Otherwise, it may cause a fire.
• Do not use the power cable near the heating tools. Otherwise, it may cause a fire and electri-
cal shock.
• Do not open the suction inlet of the indoor/outdoor unit during operation. Otherwise, it may
electrical shock and failure.
• Do not allow water to run into electrical parts. Otherwise, it may cause the failure of machine
or electrical shock.
• Do not touch the power cable with wet hands. It may cause electric shock and damage.
• Never touch the metal parts of the unit when removing the filter. They are sharp and may
cause injury.
• Do not step on the indoor/outdoor unit and do not put anything on it. It may cause an injury
through dropping of the unit or falling down.
• Do not place a heavy object on the power cable. Otherwise, it may cause a fire or electrical
shock.
• When the product is submerged into water, always contact the service center. Otherwise, it
may cause a fire or electrical shock.
• Take care so that children may not step on the outdoor unit. Otherwise, children may be seri-
ously injured due to falling down.

IMPORTANT SAFETY INSTRUCTIONS 5
ENGLISH
CAUTION
Installation
• Install the drain hose to ensure that drain can be securely done. Otherwise, it may cause
water leakage.
• Install the product so that the noise or hot wind from the outdoor unit may not cause any
damage to the neighbors. Otherwise, it may cause dispute with the neighbors.
• Always inspect gas leakage after the installation and repair of product. Otherwise, it may
cause the failure of product.
• Keep level parallel in installing the product. Otherwise, it may cause vibration or water leak-
• Means for disconnection must be incorporated in the fixed wiring in accordance with the
wiring rules.
age.
Operation
• Avoid excessive cooling and perform ventilation sometimes. Otherwise, it may do harm to
your health.
• Use a soft cloth to clean. Do not use wax, thinner, or a strong detergent. The appearance of
the air conditioner may deteriorate, change color, or develop surface flaws.
• Do not use an appliance for special purposes such as preserving animals vegetables, preci-
sion machine, or art articles. Otherwise, it may damage your properties.
• Do not place obstacles around the flow inlet or outlet. Otherwise, it may cause the failure of
appliance or an accident.
!

6TABLE OF CONTENTS
ENGLISH
2TIPS FOR SAVING ENER-
GY
3IMPORTANT SAFETY
INSTRUCTIONS
7INSTALLATION OF OUT-
DOOR UNIT
9WIRING CONNECTION
9Electrical Wiring
10 Connecting Cables between Indoor Unit
and Outdoor Unit
12 Connecting the cable to Outdoor Unit
13 CONNECTING PIPES
13 Preparation of Piping
14 Connecting the pipes to the Outdoor
unit
15 Forming the Piping
16 LEAKAGE TEST AND
EVACUATION
16 Preparation
16 Leakage test
17 Evacuation
18 TEST RUNNING
20INSTALLATION GUIDE AT
THE SEASIDE
21 CONVENIENT FUNC-
TIONS
21 Pressure compensation function
TABLE OF CONTENTS

INSTALLATION OF OUTDOOR UNIT 7
ENGLISH
- 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 spaces indicated by arrows around front, back and side of the unit.
- 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.
More than
300 mm
Fence or
obstacles
More than 700 mm
More than 600 mm
More than
300mm
More than
300 mm
Sunroof
Unit : mm
Installation Places
INSTALLATION OF OUTDOOR UNIT
Piping length and the elevation
Ceiling Suspended Air conditioner
MODEL Pipe Size Length A (m) Elevation B (m) Additional
Refrigerant (g/m)
Gas Liquid
Standard Max. Standard Max.
Ø 15.88(5/8) Ø 9.52(3/8)
Ø 12.7 (1/2) Ø 6.35 (1/4)
40
7.5 50 5 30
7.5 30 15 205
APUQ18GS1K1
Ø 15.88(5/8) Ø 9.52(3/8) 407.5 50 5 30
ATUQ24GQSK1
ATUQ18GQSK1
Ø 12.7 (1/2) Ø 6.35 (1/4) 7.5 30 15 205
APUQ30GS1K1

8INSTALLATION OF OUTDOOR UNIT
Outdoor unit
Indoor unit
A
B
Outdoor unit
Indoor unit
A
B
• Capacity is based on standard length and maximum allowance length is on the basis of
reliability.
• Improper refrigerant charge may result in abnormal cycle.
CAUTION
!
If installed tube is shorter than 7,5 m, additional charging is not necessary.
Additional Refrigerant = (A -7,5) x Additional refrigerant (g)

ENGLISH
Electrical Wiring
Perform the electrical wiring work according
to the electrical wiring connection.
- All wiring must comply with local require-
ments.
- Select a power source that is capable of sup-
plying the current required by the air condi-
tioner.
- Use a recognized ELCB(Electric Leakage
Circuit Breaker) between the power source
and the unit. A disconnection device to ade-
quately disconnect all supply lines must be
fitted.
- Model of circuit breaker recommended by
authorized personnel only
Outdoor
Indoor
Main
power source Switch box
ELCB
WIRING CONNECTION
Model Phase(Ø) ELCB
1
1 15
15
1 25
WIRING CONNECTION 9
1 25
ATUQ24GQSK1
ATUQ18GQSK1
APUQ30GS1K1
APUQ18GS1K1

10 WIRING CONNECTION
ENGLISH
Connecting cables between indoor unit and outdoor unit
Outdoor
unit Indoor unit
1
2
3
1
2
3
The power cord connected to the outdoor unit should be complied with IEC 60245 or HD 22.4
S4 (This equipment shall be provided with a cord set complying with the national regulation.
The connecting cable connected to the outdoor unit should be complied with IEC 60245 or
HD 22.4 S4 (This equipment shall be provided with a cord set complying with the national
regulation.)
If the supply cord is damaged, it must be replaced by a special cord or assembly availible
from the manufacturer of its service agent.
When the connection line between the indoor unit and out-
dooor unit is over 40 m, connect the telecommunication line
and power line separately.
CAUTION
!
GN/YL
20 mm
35±5 mm
10±3 mm
NORMAL
CROSS-SECTIONAL
AREA 0.75 mm
2
20 mm
GN/YL
35±5 mm
10±3 mm
Model Phase(Ø) Area(mm2)
1 2.5
10.75
ATUQ24GQSK1
ATUQ18GQSK1
APUQ30GS1K1
APUQ18GS1K1
ATUQ24GQSK1
ATUQ18GQSK1
APUQ30GS1K1
APUQ18GS1K1

ENGLISH
Use round pressure terminals for connections to the power terminal block.
When none are available, follow the instructions below.
- Do not connect wiring of different thicknesses to the power terminal block. (Slack in the power
wiring may cause abnormal heat.)
- When connecting wiring which is the same thickness, do as shown in the figure below.
- For wiring, use the designated power wire and connect firmly, then secure to prevent outside
pressure being exerted on the terminal block.
- Use an appropriate screwdriver for tightening the terinal screws. A screwdriver with a small
head will strip the head and make proper tighterning impossible.
- Over-tightening the terminal screws may break them.
Round pressure terminal Power wire
Connect same thickness
wiring to both sides.
It is forbidden to connect
two to one side.
It is forbidden to
connect wiring of
different thicknesses.
Precautions when laying power wiring
WIRING CONNECTION 11

ENGLISH
Connecting the cable to Outdoor Unit
Remove the side panel for wiring connection.
Use the cord clamp to fix the cable.
Earthing work
- Connect the cable of diameter more to the earthing terminal provided in the control box and do
earthing.
Tubing Cover Power cord
Power
connecting cable
CAUTION
!
12 WIRING CONNECTION
ENGLISH
Power
connecring cable
Power cord
Tubing Cover

13
CONNECTING PIPES
ENGLISH
Preparation of Piping
Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following
procedure.
C
Cut the pipes and the cable
- Use the piping kit accessory or the pipes pur-
chased locally.
- Measure the distance between the indoor
and the outdoor unit.
- Cut the pipes a little longer than measured
distance.
- Cut the cable 1.5 m longer than the pipe
length.
Burrs 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.
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 bar in the
dimension shown in the table below.
Check
- Compare the flared work with figure below.
- If flare is noted to be defective, cut off the
flared section and do flaring work again.
Copper
tube 90 Slanted Uneven Rough
Pipe
Reamer
Point down
Flare nut
Copper tube
Bar
Copper pipe
Clamp handle Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Inclined
Inside is shining without scratches.
Smooth all round
Even length
all round
Surface
damaged Cracked Uneven thickness
= Improper flaring =
Outside diameter A
mm inch mm
Ø 6.35 1/4 1.1~1.3
Ø 9.52 3/8 1.5~1.7
Ø 12.7 1/2 1.6~1.8
Ø 15.88 5/8 1.6~1.8
Ø 19.05 3/4 1.9~2.1
CONNECTING PIPES

CONNECTING PIPES
14
ENGLISH
Connecting the pipes to the Outdoor unit
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
follows the arrow on the wrench.
Gas side piping
Liquid side piping
Drain hose
Connecting wire
When tighten the pipe, hold the haxago-
nal body.
Outside diameter Torque
mm inch N m
Ø 6.35 1/4 16±2
Ø 9.52 3/8 38±4
Ø 12.7 1/2 55±6
Ø 15.88 5/8 75±7
Ø 19.05 3/4 110±10
Preventing foreign objects from entering
- Plug the pipe through-holes with putty or
insulation material(procured locally)to stop up
all gaps.
Torque wrech
Liquid side piping
(Smaller diameter)
Gas side piping
(Bigger diameter)
When tighten the pipe, hold the haxago-
nal body.

15
CONNECTING PIPES
ENGLISH
Forming the Piping
Form the piping by wrapping the connecting
portion of the indoor unit with insulation mate-
rial 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.
1Tape the piping, drain hose and connecting
cable from down to up.
2Secure 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.
1Tape the piping and connecting cable from
down to up.
2Secure the taped piping along the exterior
wall. Form a trap to prevent water entering
the room.
3Fix the piping onto the wall by saddle or
equivalent.
• Trap is required to prevent water from entering
into electrical parts.
Taping
Drain hose
Pipings
Connecting
cable
Power supply
cord
Plastic
Plastic
band
band
Plastic
band
Seal a small
Seal a small
opening around
opening around
the pipings with
the pipings with
gum type sealer.
gum type sealer.
Seal a small
opening around
the pipings with
gum type sealant.
Trap
TrapTrapTrap
Seal a small openingSeal a small opening
around the pipingsaround the pipings
with gum type sealer.with gum type sealer.
Seal a small opening
around the pipings
with gum type sealant.

LEAKAGE TEST AND EVACUATION
16
ENGLISH
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
gauges) and dry nitrogen gas cylinder to this
service port with charge hoses.
CAUTION
To avoid nitrogen entering the refrigerant
system in a liquid state, the top of the
cylinder must be higher than its bottom
when you pressurize the system. Usually,
the cylinder is used in a vertical standing
position.
!
- 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.
- 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.
Air and moisture remaining in the refrigerant
system have undesirable effects as indicated
below.
- Pressure in the system rises.
- Operating current rises.
- Cooling(or heating) efficiency drops.
- Moisture in the refrigerant circuit may freeze
and block capillary tubing.
- Water may lead to corrosion of parts in the
refrigeration system.
Therefore, the indoor/outdoor unit and con-
necting tube must be checked for leak tight,
and vacuumed to remove incondensible gas
and moisture in the system.
Charge hose
Indoor unit
Outdoor unit
Manifold valve Pressure
gauge
Nitrogen gas
cylinder(in vertical
standing position)
Lo Hi
LEAKAGE TEST AND EVACUATION
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
3,0 Mpa with dry nitrogen gas and close
the cylinder valve when the gauge read-
ing reached 3,0 MPa. Next test for leaks
with liquid soap.
!

17
LEAKAGE TEST AND EVACUATION
ENGLISH
- When the desired vacuum is reached, close
the "Lo and Hi" knob of the manifold valve
and stop the vacuum pump.
Required time for evacuation when 30 gal/h
vacuum pump is used
If tubing length is
less than 10 m(33 ft)
If tubing length is
longer than 10 m(33
ft)
30 min. or more 60 min. or more
0.07 kPa or less
- 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 to test run.
- With a service valve wrench, turn the valve
stem of liquid side valve counter-clockwise to
fully open the valve.
- Turn the valve stem of gas side valve counter-
clockwise to fully open the valve.
- Loosen the charge hose connected to the gas
side service port slightly to release the pressure,
then remove the hose.
- Replace the flare nut and its bonnet on the gas
side service port and fasten the flare nut secure-
ly with an adjustable wrench. This process is
very important to prevent leakage from the sys-
tem.
Indoor unit
Outdoor unit
Lo Hi
Manifold valve
Vacuum pump
Open Open
Pressure
gauge
Finishing the Job
Evacuation
- Connect the charge hose end described in
the preceding steps to the vacuum pump to
evacuate the tubing and indoor unit.
Confirm the "Lo and Hi" 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.

TEST RUNNING
18
ENGLISH
- The initial power supply must provide at least 90 % of the rated voltage.
Otherwise, the air conditioner should not be operated.
- The test run is started by pressing the room temperature checking button and down timer but-
ton for 3 seconds at the same time.
- To cancel the test run, press any button.
C
CHECK THE FOLLOWING ITEMS WHEN INSTALLATION IS COMPLETE
- After completing work, be sure to measure and record trial run properties, and store measured
data, etc.
- Measuring items are room temperature, outside temperature, suction temperature, blow out
temperature, wind velocity, wind volume, voltage, current, presence of abnormal vibration and
noise, operating pressure, piping temperature, compressive pressure.
- As to the structure and appearance, check following items.
• Connect the power supply cable to the independent power supply.
- Circuit breaker is required.
• Operate the unit for fifteen minutes or more.
Precautions In Test Running
Connection of power supply
Evaluation of the performance
CAUTION
For test run, carry out the cooling operation firstly even during heating season. If heating operation
is carried out firstly, it leads to the trouble of compressor. Then attention must be paid.
Carry out the test run more than 5 minutes without fail.
(Test run will be cancelled 18 minutes later automatically)
!
□Is the circulation of air adequate?
□Is the draining smooth?
□Is the heat insulation complete
(refrigerant and drain piping)?
□Is there any leakage of refrigerant?
□Is the remote controller switch operated?
□Is there any faulty wiring?
□Are not terminal screws loosened?
M4......118 N cm {12 kgf cm}
M5......196 N cm {20 kgf cm}
M6......245 N cm {25 kgf cm}
M8......588 N cm {60 kgf cm}
- Measure the temperature of the intake and
discharge air.
- Ensure the difference between the intake
temperature and the discharge one is more
than 8 °C (Cooling) or reversely (Heating).
TEST RUNNING

19
TEST RUNNING
ENGLISH
CAUTION
After the confirmation of the above conditions, prepare the wiring as follows:
1Never fail to have an individual power specialized for the air conditioner. As for the
method of wiring, be guided by the circuit diagram pasted on the inside of control box
cover.
2Provide a circuit breaker switch between power source and the unit.
3The 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.)
4Specification of power source
5Confirm that electrical capacity is sufficient.
6Be sure that the starting voltage is maintained at more than 90 percent of the rated volt-
age marked on the name plate.
7Confirm that the cable thickness is as specified in the power sources specification.
(Particularly note the relation between cable length and thickness.)
8Never fail to equip a leakage breaker where it is wet or moist.
9The following troubles would be caused by voltage drop-down.
- Vibration of a magnetic switch, damage on the contact point there of fuse breaking, dis-
turbance to the normal function of a overload protection device.
- Proper starting power is not given to the compressor.
!

INSTALLATION GUIDE AT THE SEASIDE
ENGLISH
If the outdoor unit is to be installed close to
the seaside, direct exposure to the sea wind
should be avoided. Install the outdoor unit on
the opposite side of the sea wind direction.
In case, to install the outdoor unit on the
seaside, set up a windbreak not to be
exposed to the sea wind.
- It should be strong enough like concrete to
prevent the sea wind from the sea.
- The height and width should be more than
150 % of the outdoor unit.
- It should be keep more than 70 cm of space
between outdoor unit and the windbreak for
easy air flow.
Select a well-drained place.
Sea wind
Sea wind
Sea wind
Windbreak
• Periodic ( more than once/year ) clean-
ing of the dust or salt particles stuck on
the heat exchanger by using water.
• Air conditioners should not be installed
in areas where corrosive gases, such as
acid or alkaline gas, are produced.
• Do not install the product where it could
be exposed to sea wind (salty wind)
directly. It can result corrosion on the
product. Corrosion, particularly on the
condenser and evaporator fins, could
cause product malfunction or inefficient
performance.
• If outdoor unit is installed close to the
seaside, it should avoid direct exposure
to the sea wind. Otherwise it needs
additional anticorrosion treatment on the
heat exchanger.
CAUTION
!
Selecting the location(Outdoor Unit)
INSTALLATION GUIDE AT THE SEASIDE
20