ENGLISH

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 : MFL67448518
www.lg.com
 2 TIPS FOR SAVING ENERGY
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TIPS FOR SAVING ENERGY

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:

• 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 :
 IMPORTANT SAFETY INSTRUCTIONS 3

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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 power cord, a plug or a loose socket which is damaged. 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 air leakage 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 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.
• 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, control box
cover are removed or opened. Otherwise, it may cause fire, electric shock, explosion or death.
 4 IMPORTANT SAFETY INSTRUCTIONS
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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 cord. Otherwise, it may cause a fire or electrical shock.
• Do not modify or extend the power cord randomly. Otherwise, it may cause a fire or electrical
shock.
• Take care so that the power cord may not be pulled during operation. Otherwise, it may cause a fire
or electrical shock.
• Unplug 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.
• Take the power plug out if necessary, holding the head of the plug and do not touch it with wet
hands. Otherwise, it may cause a fire or electrical shock.
• Do not use the power cord near the heating tools. Otherwise, it may cause a fire and electrical
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.
• Hold the plug by the head when taking it out. 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 cord. 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 seriously
injured due to falling down.

! CAUTION
Installation
• Install the drain hose to ensure that drain can be securely done. Otherwise, it may cause water leak-
age.
• 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 leakage.

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, precision
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 appli-
ance or an accident.
 TABLE OF CONTENTS 5

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TABLE OF CONTENTS
2 TIPS FOR SAVING ENERGY 17 LEAKAGE TEST AND
EVACUATION
17 Preparation
3 IMPORTANT SAFETY 17 Leakage test
INSTRUCTIONS 18 Evacuation

6 INSTALLATION OF OUT- 19 TEST RUNNING

DOOR UNIT
9 Night Silent Operation setting
21 FUNCTION
21 Forced Cooling Operation
10 WIRING CONNECTION
10 Electrical Wiring
11 Connecting Cables between Indoor Unit 22 SELF-DIAGNOSIS FUNC-
and Outdoor Unit TION
13 Connecting the cable to Outdoor Unit 22 Error Indicator (Outdoor)

14 CONNECTING PIPES 24 INSTALLATION GUIDE AT

14 Preparation of Piping THE SEASIDE
15 Connecting the pipes to the Outdoor
unit
16 Forming the piping
 6 INSTALLATION OF OUTDOOR UNIT
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INSTALLATION OF OUTDOOR UNIT

Installation Places
- 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.

Su Unit : mm
nro
of
More than
300mm

More than
Fe 300mm
ob nce o
sta r
cle
s
More than 600mm
More than 700mm

Piping length and the elevation

Free Joint Single Outdoor

Pipe Size Length A (m) Elevation B (m) Additional

MODEL CAPACITY Refrigerant
Gas Liquid Standard Max. Standard Max. (g/m)
AUUQ18GH2 5kW Ø12.7(1/2) Ø6.35(1/4) 5 30 5 15 20
AUUQ24GH2 7kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
AUUQ36GH2 10kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
AUUQ48GH2 13.4kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
AUUQ54GH2 15.8kW Ø19.05(3/4) Ø9.52(3/8) 5 50 5 30 20
 INSTALLATION OF OUTDOOR UNIT 7

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Ceiling Cassette

Pipe Size Length A (m) Elevation B (m) Additional

MODEL CAPACITY Refrigerant
Gas Liquid Standard Max. Standard Max. (g/m)
ATUQ18GPLE5
5kW Ø12.7(1/2) Ø6.35(1/4) 5 30 5 15 20
ATUQ18GQLE5
ATUQ24GPLE5
7kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
ATUQ24GQLE5
ATUQ36GPLE5 10kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
ATUQ48GMLE5 13.4kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
ATUQ54GMLE5 15.8kW Ø19.05(3/4) Ø9.52(3/8) 5 50 5 30 20

Ceiling Suspended Air conditioner

Pipe Size Length A (m) Elevation B (m) Additional

MODEL CAPACITY Refrigerant
Gas Liquid Standard Max. Standard Max. (g/m)
AVUQ18GJLA2 5kW Ø12.7(1/2) Ø6.35(1/4) 5 30 5 15 20
AVUQ24GJLA2 7kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
AVUQ36GKLA2 10kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
AVUQ48GLLA2 13.4kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
AVUQ54GLLA2 15.8kW Ø19.05(3/4) Ø9.52(3/8) 5 50 5 30 20

Ceiling Concealed Duct

Ceiling Concealed Duct – Low Static

Pipe Size Length A (m) Elevation B (m) Additional

MODEL CAPACITY Refrigerant
Gas Liquid Standard Max. Standard Max. (g/m)
ABUQ18GM1A2
5kW Ø12.7(1/2) Ø6.35(1/4) 5 30 5 15 20
ABUQ18GL2A1
ABUQ24GM1A2
7kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
ABUQ24GL3A1
ABUQ36GM2A2 10kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
ABUQ48GM3A2 13.4kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
ABUQ54GM3A2 15.8kW Ø19.05(3/4) Ø9.52(3/8) 5 50 5 30 20

Floor Standing Air Conditioner

Pipe Size Length A (m) Elevation B (m) Additional

MODEL CAPACITY Refrigerant
Gas Liquid Standard Max. Standard Max. (g/m)
APUQ36GRA2 10kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
APUQ48GTA2 13.4kW Ø15.88(5/8) Ø9.52(3/8) 5 50 5 30 20
 8 INSTALLATION OF OUTDOOR UNIT
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If installed tube is shorter than 15 m, additional charging is not necessary.

Additional Refrigerant = (A -15) x Additional refrigerant (g)

Indoor unit
Outdoor unit

A A

B Outdoor unit Indoor unit B

! CAUTION
• Capacity is based on standard length and maximum allowance length is on the basis of
reliability.
• Improper refrigerant charge may result in abnormal cycle.
 INSTALLATION OF OUTDOOR UNIT 9

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Night Silent Operation setting
- Open the Side panel or Top Cover of outdoor unit.
- Set the SW1 or DIP-SW01D.

Step 1
6 7 8 9 10

Step 2
6 7 8 9 10

SW1 DIP–SW01D

6 7 8 9 10

AUUQ36GH2 AUUQ48GH2 / AUUQ54GH2

ATUQ36GPLE5 ATUQ48GMLE5 / ATUQ54GMLE5
ABUQ36GM2A2 ABUQ48GM3A2 / ABUQ54GM3A2
AVUQ36GKLA2 AVUQ48GLLA2 / AVUQ54GLLA2
APUQ36GRA2 APUQ48GTA2

- Close the Side panel or Top Cover.

! WARNING
• When you set the dip switch, you should turn off the circuit breaker or shut the power
source of the product down.

! CAUTION
• Unless the applicable dip switch is set properly, the product may not work.
• If you want to set a specific function, request that the installer sets the dip switch appro-
priately during installation.
 10 WIRING CONNECTION
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WIRING CONNECTION
Electrical Wiring
Perform the electrical wiring work according
to the electrical wiring connection. ELCB
- All wiring must comply with local require- Main
power source
ments. Switch box
- Select a power source that is capable of sup-
plying the current required by the air condi-
tioner. Outdoor
- Use a recognized ELCB(Electric Leakage Indoor
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

Model Phase(Ø) ELCB

AUUQ18GH2
ATUQ18GPLE5 / ATUQ18GQLE5
1 20A
ABUQ18GM1A2 / ABUQ18GL2A1
AVUQ18GJLA2

AUUQ24GH2
ATUQ24GPLE5 / ATUQ24GQLE5
1 25A
ABUQ24GM1A2 / ABUQ24GL3A1
AVUQ24GJLA2

AUUQ36GH2
ATUQ36GPLE5 / ABUQ36GM2A2 1 30A
AVUQ36GKLA2 / APUQ36GRA2

AUUQ48GH2
ATUQ48GMLE5 / ABUQ48GM3A2 1
AVUQ48GLLA2 / APUQ48GTA2
40A
AUUQ54GH2
ATUQ54GMLE5 / ABUQ54GM3A2 1
AVUQ54GLLA2
 WIRING CONNECTION 11

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Connecting Cables between Indoor Unit and Outdoor Unit

Outdoor Indoor
unit unit

3 3
2 2
1 1

! CAUTION
The power cord connected to the outdoor unit should be complied withIEC 60245 or HD 22.4
S4 (This equipment shall be provided with a cord set complying with the national regulation.

Model Phase(Ø) Area(mm2)

AUUQ18GH2 / ATUQ18GPLE5 / ATUQ18GQLE5
10±3mm ABUQ18GM1A2 / ABUQ18GL2A1 / AVUQ18GJLA2
mm AUUQ24GH2 / ATUQ24GPLE5 / ATUQ24GQLE5
35
±5 1 2.5
ABUQ24GM1A2 / ABUQ24GL3A1 / AVUQ24GJLA2
AUUQ36GH2 / ATUQ36GPLE5 / ABUQ36GM2A2
GN
/Y
L AVUQ36GKLA2 / APUQ36GRA2
20
mm AUUQ48GH2 / ATUQ48GMLE5 / ABUQ48GM3A2
AVUQ48GLLA2 / APUQ48GTA2
1 6
AUUQ54GH2 / ATUQ54GMLE5 / ABUQ54GM3A2
AVUQ54GLLA2

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.)
10±3mm
mm
±5
35 NORMAL When the connection line between the indoor unit and out-
CROSS-SECTIONAL
AREA 0.75mm2
dooor unit is over 40m, connect the telecommunication line
GN
/Y
L and power line separately.
20
mm

If the supply cord is damaged, it must be replaced by a special cord or assembly availible
from the manufacturer of its service agent.
 12 WIRING CONNECTION
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Precautions when laying power wiring

Use round pressure terminals for connections to the power terminal block.

Power wire
Round pressure terminal

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.
 WIRING CONNECTION 13

ENGLISH
Connecting the cable to Outdoor Unit

Remove the side panel for wiring connection.

Use the cord clamp to fix the cord.
Earthing work
- Connect the cable of diameter more to the earthing terminal provided in the control box and do
earthing.

Connecting cable terminal

Power cord terminal

Cord clamp

* Make sure the rubber bushes are

properly used in knock-out holes after
connecting main power.

! 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.
• The Power cord connected to the unit should be selected according to the following speci-
fications.
 14 CONNECTING PIPES
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CONNECTING PIPES
Preparation of Piping
Main cause of gas leakage is defect in flaring work.
Carry out correct flaring work in the following procedure.

Cut the pipes and the cable.

- Use the accessory piping kit or the pipes pur-
chased locally. Copper
- Measure the distance between the indoor tube 90° Slanted Uneven Rough
and the outdoor unit.
- Cut the pipes a little longer than measured
distance.
- Cut the cable 1.5m longer than the pipe
length.

Pipe
Burrs removal
- Completely remove all burrs from the cut Reamer
cross section of pipe/tube.
- Put the end of the copper tube/pipe to down-
Point down
ward direction as you remove burrs in order
to avoid to let burrs drop in the tubing.

Putting nut on Flare nut

- Remove flare nuts attached to indoor and
outdoor units, than put them on pipe/tube
having completed burr removal. Copper tube
(Not possible to put them on after flaring
work)

Flaring work
- Carry out flaring work using dedicated flaring Handle
tool for R-410A as shown below.
Bar Bar
"A" Yoke
Outside diameter A
mm inch mm Cone
Ø 6.35 1/4 1.1~1.3
Ø 9.52 3/8 1.5~1.7 Copper pipe
Ø 12.7 1/2 1.6~1.8 Clamp handle
Red arrow mark
Ø 15.88 5/8 1.6~1.8
Ø 19.05 3/4 1.9~2.1
Firmly hold copper tube in a bar(or die) as Smooth all round
indicated dimension in the table above. Inside is shining without scratches

= Improper flaring =
Check
- Compare the flared work with figure below.
- If flare is noted to be defective, cut off the
Inclined Surface Cracked Uneven
flared section and do flaring work again. damaged thickness
Even length
all round
 CONNECTING PIPES 15

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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. Torque
wrench
Outside diameter Torque
mm inch N·m Contin
Ø 6.35 1/4 16±2 -uous
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
h When tighten the pipe, hold the haxago-
nal body.

Preventing foreign objects from entering

- Plug the pipe through-holes with putty or
insulation material(procured locally)to stop up
all gaps.

Drain hose

Connecting wire
Gas side piping

Liquid side piping

! CAUTION
Insects or small animals entering the outdoor unit may cause a short circuit in the electrical
box.
 16 CONNECTING PIPES
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Forming the piping In cases where the outdoor unit is installed

above the indoor unit perform the following.
Form the piping by wrapping the connecting
portion of the indoor unit with insulation mate-
1 Tape the piping and connecting cable from
down to up.
rial and secure it with two kinds of vinyl tape.
- If you want to connect an additional drain
2 Secure the taped piping along the exterior
wall. Form a trap to prevent water entering
hose, the end of the drain outlet should be
the room.
routed above the ground. Secure the drain
hose appropriately. 3 Fix the piping onto the wall by saddle or
equivalent.

In cases where the outdoor unit is installed

below the indoor unit perform the following. Seal a small opening
around the pipings
1 Tape the piping, drain hose and connecting with gum type sealer.
sealant.
cable from down to up. Trap
2 Secure the tapped piping along the exterior
wall using saddle or equivalent.

Seal a small
opening around Trap
the pipings with
gum type sealer.
sealant. Taping
Drain hose

Plastic
band
Pipings
Connecting
cable

Power supply
cord

• Trap is required to prevent water from entering

into electrical parts.
 LEAKAGE TEST AND EVACUATION 17

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LEAKAGE TEST AND EVACUATION
Air and moisture remaining in the refrigerant
system have undesirable effects as indicated ! CAUTION
below. To avoid nitrogen entering the refrigerant
- Pressure in the system rises. system in a liquid state, the top of the
- Operating current rises. cylinder must be higher than its bottom
when you pressurize the system. Usually,
- Cooling(or heating) efficiency drops.
the cylinder is used in a vertical standing
- Moisture in the refrigerant circuit may freeze position.
and block capillary tubing.
- Water may lead to corrosion of parts in the
refrigeration system. - Do a leakage test of all joints of the
Therefore, the indoor/outdoor unit and con- tubing(both Indoor unit and outdoor unit) and
necting tube must be checked for leak tight, both gas and liquid side service valves.
and vacuumed to remove incondensible gas Bubbles indicate a leak. Be sure to wipe off
and moisture in the system. 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
Preparation cylinder. When the system pressure is
reduced to normal, disconnect the hose from
Check that each tube(both liquid and gas side the cylinder.
tubes) between the indoor and outdoor units
have been properly connected and all wiring Indoor unit
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. Outdoor unit

Leakage test
Connect the manifold valve(with pressure
gauges) and dry nitrogen gas cylinder to this
service port with charge hoses.
Manifold valve
Pressure
! CAUTION Lo Hi gauge

Be sure to use a manifold valve for leakage

test. If it is not available, use a stop valve for Charge hose
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 Nitrogen gas
the cylinder valve when the gauge read- cylinder(in vertical
ing reached 3.0 MPa Next, test for leaks standing position)
with liquid soap.
 18 LEAKAGE TEST AND EVACUATION
ENGLISH

Evacuation Indoor unit

- 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 Outdoor unit
tubing length and capacity of the pump. The
following table shows the time required for
evacuation.

Required time for evacuation when 30 gal/h

vacuum pump is used

If tubing length is If tubing length is

less than 10 m(33 ft) longer than 10 m(33 ft)

30 min. or more 60 min. or more

0.07 kPa or less Manifold valve

- When the desired vacuum is reached, close Pressure

Lo Hi
the "Lo and Hi" knob of the manifold valve gauge
and stop the vacuum pump.

Open Open
Finishing the job

- 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. Vacuum pump
- 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.
- 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.
 TEST RUNNING 19

ENGLISH
TEST RUNNING
Precautions In Test Running
- The initial power supply must provide at least 90% of the rated voltage.
Otherwise, the air conditioner should not be operated.

! 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)

- 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.

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.

□Is the circulation of air adequate? □Is the remote controller switch operated?
□Is the draining smooth? □Is there any faulty wiring?
□Is the heat insulation complete □Are not terminal screws loosened?
(refrigerant and drain piping)?
□Is there any leakage of refrigerant? 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}

Connection of power supply

- Connect the power supply cord to the independent power supply.
Circuit breaker is required.
- Operate the unit for fifteen minutes or more.

Evaluation of the performance

- 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).
 20 TEST RUNNING
ENGLISH

! 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 pasted on the inside of control box
cover.
2 Provide a circuit breaker switch between power source and the unit.
3 The 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.)
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 volt-
age marked on the name plate.
7 Confirm that the cable thickness is as specified in the power sources specification.
(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 there of fuse breaking, dis-
turbance to the normal function of a overload protection device.
- Proper starting power is not given to the compressor.
 FUNCTION 21

ENGLISH
FUNCTION
Forced Cooling Operation
Adding the refrigerant in winter.

Setting Procedure
- Set the Dip Switch as follow after shutting the power source down.

6 7 8 9 10

AUUQ36GH2 AUUQ48GH2 / AUUQ54GH2

ATUQ36GPLE5 ATUQ48GMLE5 / ATUQ54GMLE5
ABUQ36GM2A2 ABUQ48GM3A2 / ABUQ54GM3A2
AVUQ36GKLA2 AVUQ48GLLA2 / AVUQ54GLLA2
APUQ36GRA2 APUQ48GTA2

- Reset the power.

- Red LED and Green LED of PCB lights during work. (The indoor unit is operated by force.)
- If operation is done, Red LED will be turned off.
If operation is not done normally, Red LED will blink.
- Close the Liquid valve only after green LED turned off (7 minutes from the start of the machine).
Then close the gas valve after Green LED on.

! WARNING
• When the green LED of PCB is on, com- Pump Down Dip S/W Setting
pressor is going to be off because of low
pressure.
Power on
• You should return the Dip Switch to oper- (Red LED On, Green LED Off)
ate normally after finishing the operation.
• Improper Pump down will lead to product Comp on
turn off along with LED (green &red) off (Red LED On, Green LED On)
with in 20 minutes from the initial start.
Pump Down Start Liquid Valve
(Red LED On, Green LED Off) Closed

Pump Down Complete Gas Valve

(Red LED Off, Green LED On) Closed

Power off
(Red LED Off, Green LED On)
 22 SELF-DIAGNOSIS FUNCTION
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SELF-DIAGNOSIS FUNCTION
Error Indicator (Outdoor)
2 Times 1 Time 2 Times 1 Time 2 Times 1 Time

LED Outdoor Error

(RED)
1 Sec. 1 Sec. 1 Sec.
Ex) Error 21 (DC Peak)
2 Sec. 2 Sec.

AUUQ18GH2 / AUUQ24GH2 / ATUQ18GPLE5 / ATUQ24GPLE5

ATUQ18GQLE5 / ATUQ24GQLE5 / ABUQ18GM1A2 / ABUQ24GM1A2
AVUQ18GJLA2 / AVUQ24GJLA2 / ABUQ18GL2A1 / ABUQ24GL3A1

2 Times 2 Times 2 Times

LED 1
(RED)
1 Sec. 1 Sec. 1 Sec.
Outdoor Error
1 Time 1 Time 1 Time Ex) Error 21 (DC Peak)
LED 2
(GREEN)
2 Sec. 2 Sec.

AUUQ48GH2 / AUUQ54GH2 / ATUQ48GMLE5

AUUQ36GH2 / ATUQ36GPLE5 / ABUQ36GM2A2
ATUQ54GMLE5 / ABUQ48GM3A2 / ABUQ54GM3A2
AVUQ36GKLA2 / APUQ36GRA2
AVUQ48GLLA2 / AVUQ54GLLA2 / APUQ48GTA2
 SELF-DIAGNOSIS FUNCTION 23

ENGLISH
LED LED
(Red) (Red) Indoor
Error Code Description
LED 1 LED 2 status
(Red) (Green)
21 DC Peak(IPM Fault) 2times ◑ 1time ◑ OFF
22 Max. CT(CT2) 2times ◑ 2times ◑ OFF
23 DC Link Low Volt. 2times ◑ 3times ◑ OFF
24 Pressure switch/Heater Sink. 2times ◑ 4times ◑ OFF
26 DC Comp Position Error 2times ◑ 6times ◑ OFF
27 PFC Fault Error 2times ◑ 7times ◑ OFF
29 Comp Over Current 2times ◑ 9times ◑ OFF
32 D-Pipe High(Inv.) 3times ◑ 2times ◑ OFF
40 CT Sensor(Open/Short) 4times ◑ 0 OFF
41 Inv. D-Pipe Th Error(Open/Short) 4times ◑ 1time ◑ OFF
43 Pressure Sensor(Open/Short) 4times ◑ 3times ◑ OFF
44 Outdoor air Th Error(Open/Short) 4times ◑ 4times ◑ OFF
45 Cond. Middle Pipe Th Error(Open/Short) 4times ◑ 5times ◑ OFF
51 Capacity over 5times ◑ 1times ◑ OFF
53 Communication Error(Indoor ÷ Outdoor) 5times ◑ 3times ◑ OFF
60 EEPROM Error(Outdoor) 6times ◑ 0 OFF
61 Cond. Middle Pipe High 6times ◑ 1times ◑ OFF
62 Heatsink Error(High) 6times ◑ 2times ◑ OFF
65 Heatsink Th Error(Open/Short) 6times ◑ 5times ◑ OFF
67 BLDC motor fan lock(Outdoor) 6times ◑ 7times ◑ OFF

If abnormal voltage is supplied, the protection circuits will turn off the product in order to prevent
the component damage. The product will automatically restart after 3 minutes.
 24 INSTALLATION GUIDE AT THE SEASIDE
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INSTALLATION GUIDE AT THE SEASIDE

In case, to install the outdoor unit on the
! CAUTION seaside, set up a windbreak not to be
• Air conditioners should not be installed exposed to the sea wind.
in areas where corrosive gases, such as
acid or alkaline gas, are produced.
Windbreak
• 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 Sea wind
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 - It should be strong enough like concrete to
heat exchanger. prevent the sea wind from the sea.
- The height and width should be more than
150% of the outdoor unit.
Selecting the location(Outdoor Unit) - It should be keep more than 70 cm of space
between outdoor unit and the windbreak for
If the outdoor unit is to be installed close to easy air flow.
the seaside, direct exposure to the sea wind
should be avoided. Install the outdoor unit on
Select a well-drained place.
the opposite side of the sea wind direction.

• Periodic ( more than once/year ) clean-

Sea wind
ing of the dust or salt particles stuck on
the heat exchanger by using water

Sea wind