LG M30AH INSTALLATION INSTRUCTIONS

ENGLISH

LG
Air Conditioner

INSTALLATION MANUAL

LG

website http://www.lgservice.com
e-mail http://www.lgeservice.com/techsup.html

IMPORTANT

• Please read this instruction sheet 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.

2 Room Air Conditioner

Multi Air Conditioner Installation Manual

TABLE OF CONTENTS

The following should be
always observed for

safety................................4~5

Installation of Indoor,

Outdoor Unit..................6~10

Flaring work and piping

connection...................11~15

Connecting the Cable
between Indoor Unit and
Outdoor Unit

................16~17

Checking the Drainage and
Forming the Pipings...18~19

Vacuum........................20~21

Panel Front Assembly.......22

Test running.......................23

Installation

Requirements

Required Parts Required T ools

❏ 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
❏ Specified to torque wrenches

1.8kg.m, 4.2kg.m, 5.5kg.m,

6.6kg.m (different depending on
model No.)

❏ Spanner....................Half union

❏ A glass of water
❏ Screw driver
❏ Hexagonal Wrench (4mm)
❏ Gas-leak Detector
❏ Vacuum pump
❏ Gauge manifold

❏ 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

5. Copper pipe (Liquid side)

6. Copper pipe (Gas side)

7. Connecting cable

more than

20cm

more than

70cm

more than

20cm

more than

20cm

more than

70cm

more than

30cm

more than

30cm

Air Outlet

Air Intake

(side, rear)

Connection pipe
Drain hose

Connecting wire

Control cover

more than

30cm

4 Room Air Conditioner

Safety Precautions

Do not disassemble or repair the product.

• Contact your dealer or service center.

Always earth the product.

• It will cause fire or electric shock.

Do not handle the flamable gas or explosive
materials near the product.

• Otherwise, it may cause fire or failure of
product.

Do not install where flammable gas could
leak.

• Otherwise, it may cause explosion or fire.

Do not install the product on a defective
installation stand.

• Otherwise, It may cause injury or accident.

Be cautious when unpack and install the
product.

• Sharp edges could cause injury.

For electric work, contact the dealer or
service center.

• Otherwise, It will cause fire or electric shock.

Do not use damaged power cable.

• It will cause fire or electric shock.

For installation, always contact the dealer or
service center.

• Otherwise, it may cause fire, electric shock,
explosion or injury.

Do not install the product on a defective
installation stand.

• Otherwise, It may cause injury or accident

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 har m or damage. The seriousness

is classified by the following indications.

■ Meanings of symbol 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.

Safety Precautions

Installation Manual 5

ENGLISH

Safety Precautions

If strange sound, smell or smoke come from
product, turn the breaker off or disconnect
the power supply cable.

• Otherwise, it may cause electric shock or fire.

Do not put the heater, etc. near the power
cable.

• Otherwise, it may cause fire and electric shock.

Cover the electric part.

• Otherwise, it may cause fire or electric shock.

Do not turn the breaker on/off or
connect/disconnect the power supply plug
during operation.

• Otherwise, it may cause fire or electric shock.

Do not open the suction inlet of the product
during operation.

• Otherwise, it may cause electric shock or
failure.

Do not touch the metal parts of the product
when removing the air filter.

• Otherwise, it may cause personal injury.

Always inspect gas leakage after
installation and repair of product.

• Otherwise, it may cause failure of product.

Install the drain hose to ensure that drain
can be securely done.

• Otherwise, it may cause water leakage.

Keep the level even in installing the
product.

• Otherwise, it may cause vibration or water
leakage.

Do not install the product where the noise
or hot wind from the outdoor unit could
give any damage to the neighborhood

• Otherwise, it may cause dispute with the
neighborhoods.

Do not step or put anyting on the product.

• Otherwise, it may cause personal injury and
failure of product.

Always intstall an circuit breaker and main
breaker.

• No installation may cause fire and electric
shock.

Do not touch(operate) product with wet
hands.

• Otherwise, it may cause fire or electric shock.

CAUTION

6 Room Air Conditioner

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. Select a place where there are no obstacles
in front of the unit.

3. Make sure that condensation drainage can be
conveniently routed away.

4. Do not install near a doorway.

5. Ensure 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 10cm

More than 5cm

More than 2.3m

More than 5cm

More than 10cm

More than 50cm

More than 2m

More than 50cm

CAUTION: Install the indoor unit
on the wall where the height from
the floors more than 2.3 meters.

more than

20cm

more than

70cm

more than

30cm

more than

70cm

more than

20cm

more than

30cm

Installation of Indoor, Outdoor Unit

Installation Manual 7

ENGLISH

Multi Piping Type (m)

Piping length and elevation

14k 15+15=30 15 7.5 7.5
18k 15+15=30 15 7.5 7.5
21k 15+15+15=45 15 7.5 7.5
30k 15+15+15+15=60 15 7.5 7.5

Outdoor Capacity

(Btu/h)

Total Length

(m)

Max Length(A/B)

(m)

Max Elevation (h1)

(m)

In - In Elevation (h2)

(m)

7~12k 3/8" 1/4" 7.5 30

18~24k 1/2" 1/4" 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 of Indoor, Outdoor Unit

8 Room Air Conditioner

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

A

Ø70mm

(SQ, SR, ST, SU)

Left rear piping Right rear piping

B

A

D

C

Installation plate

(SZ)

SQ(7k~9k) 75 12 80 12

SR(9k~12k) 0 40 20 40

ST(18k~24k) 105 0 210 0

SZ(7k) 35 33 156 33

SU(9k~12k) 92 44 67 44

CHASSIS (Grade)

Distance (mm)

ABCD

Installation Manual 9

ENGLISH

Installation of Indoor, Outdoor Unit

Preparing work for Installation (Artcool Type Only)

Open panel front

1. First, push the front panel backward and lift it up to remove the two screws.

2.The moment of lifting the both lower parts of panel front, you can hear sound when this panel
came out, At this time panel front is separated

3. After pull down this panel a bit, and separate connecting wire with product.

Remove cover pipe and cover side

1. Remove two screws(for fixing cover pipe)

2. Pull up the cover side of desired connecting
direction, then cover side is separated.

3. In case connecting direction is left or right, path

through the hole of cover side.

CAUTION: After removing the pipe
hole, cut the burr for safety.

When connecting pipe path through rear
wall, don’t remove the hole.

NOTICE

Drain hose junction

1. Remove the rubber cap of desired drain
direction.

2. As the following picture, Insert drain hose in
the handle of drain pan, and join drain hose
and connecting hose.

Panel Front

Connector

Pipe hole

Adhesive

Drain

hose

Connecting

part

Only one

desiring direction

rubber cap

10 Room Air Conditioner

Installation of Indoor, Outdoor Unit

• Drill the piping hole with a ø70mm hole core drill. Dr ill the piping hole at either the right or the
left with the hole slightly slanted to the outdoor side.

Drill a hole in the wall

5-7mm

(3/16"~5/16")

Indoor

WALL

Outdoor

5-7mm

(0.2"~0.3")

Indoor

WALL

Outdoor

Standard / Artcool Deluxe type Artcool type

Sticking the installation guide map and fixing Indoor unit (Artcool Type Only)

Plastic anchors

INSTALLATION GUIDE MAP

1

0

m

m

INSTALLATION GU

IN

S

T

A

IIA

T

IO

N

G

U

ID

E

M

A

P

Put an Installation Guide Map on the desired surface.

Make a hole with diameter of 6mm and depth of
30-35mm when piercing a screw point.

Drive the fore plastic anchors into drilled points.

Hang the hole of product at the upper screws.
(In this time, Remove the map)

(Falling attention)

Check the fixed product with light power.

Look at suited horizon by horizontal meter on the
horizontal setting line, and Fix lightly the map by
adhesive tape.

Drill the piercing part for connecting pipe as diameter
50mm. (In case of piercing rear surface)

Refer to No. 5 on this page when making a hole in the wall.

First, Drive the two points of the upper parts by screws
(Leave 10mm for hanging product)

Drive the lower parts after facing the hole of product
with plastic anchors, and fix completely the upper
screws.

In case of nothing wrong in the matter, connect the pipe
and the wire. (Installation manual reference)

Horizontality

INSTALLATION GUIDE MAP

Plastic anchors

INSTALLATION GUIDE MAP

IN

S

T

A

L

L

A

T

IO

N

G

U

ID

E

M

A

P

Hanger hole

(Rear side of

product)

Installation Manual 11

ENGLISH

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

shown in the table above.

Copper

pipe

90°

Slanted Uneven Rough

mm inch mm

Ø6.35 1/4 0~0.5
Ø9.52 3/8 0~0.5

Ø12.7 1/2 0~0.5
Ø15.88 5/8 0~1.0
Ø19.05 3/4 1.0~1.3

Outside diameter A

Bar

Copper pipe

Clamp handle

Red arrow mark

Cone

Yoke

Handle

Bar

"A"

Point down

Copper tube

Pipe

Reamer

Flare nut

12 Room Air Conditioner

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

Drain hose

Drain hose

CAUTION: 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.

Connecting
cable

Drain hose

Loop

Gas side
piping

Liquid side
piping

Tape

Connecting
pipe

Drain hose

Connecting cable

Connecting
cable

Drain hose

Loop

Gas side piping

Liquid side piping

Installation Manual 13

ENGLISH

Flaring Work Piping Connection

Indoor unit installation

1. Hook the indoor unit onto the upper por tion 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

mm inch kg.m

Ø6.35 1/4 1.8
Ø9.52 3/8 4.2

Ø12.7 1/2 5.5
Ø15.88 5/8 6.6
Ø19.05 3/4 6.6

Outside diameter Torque

Vinyl tape(narrow)

Adhesive

Drain pipe

Indoor unit drain hose

Indoor unit tubing Flare nut Pipings

Spanner (fixed)

Flare nut

Torque wrench
Indoor unit tubing

Connection pipe

Connection
pipe

Vinyl tape
(wide)

Plastic bands

Connecting cable

Vinyl tape(narrow)

Insulation material

Indoor
unit pipe

Wrap with vinyl tape

Pipe

14 Room Air Conditioner

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.

Installation Manual 15

ENGLISH

Flaring Work Piping Connection

❈ When piping installation work, following

indoor units must be used the connector
which is in each indoor 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
following the arrow on the wrench.

Gas side piping

Liquid side piping

Torque wrench

B-UNIT

A-UNIT

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
Ø19.05 3/4 6.6

Indoor Capacity

(Btu/h)

Gas Side

18k

Ø9.52

→ Ø12.7

24k

16 Room Air Conditioner

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

14k~24k 30k 40k

2.5 3.5 5.5

Cable Type

H05RN-F H05RN-F H05RN-F

NORMAL CROSS

SECTIONAL AREA

Grade

(mm2)

NORMAL
CROSS-SECTIONAL
AREA 0.75mm

2

ø7.5mm

GN/YL

20mm

Installation Manual 17

ENGLISH

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)

7k~14k 18k~21k 24k~28k 30k, 32k 36k, 40k

15 20 30 30 40

Power cord

Connecting

cable

Cover control

Terminal block

Outdoor unit

Over 5mm

Holder for

power supply

cord

Loosen terminal screw

Terminal block

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 star ting 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 ear th 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.

18 Room Air Conditioner

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.

Water
leakage

Accumulated
drain water

Air

Waving

Do not raise

Water
leakage

Water
leakage

Tip of drain hose
dipped in water

Ditch

Downward slope

Less than
50mm gap

Installation Manual 19

ENGLISH

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

cable from down to up.

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.

Seal a small opening
around the pipings
with gum type sealer.

Trap

Trap

20 Room Air Conditioner

Vacuum

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 por t
with charge hoses.

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

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 counter­clockwise 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.

Vacuum

Installation Manual 21

ENGLISH

3-way valve

(Close)

2-way valve

(Open)

2-way valve

(Open)

3-way valve

(Close)

Gas side piping

Liquid side piping

B-UNIT

A-UNIT

Outdoor unit

Cap

Hexagonal wrench

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

Vacuum pump

Pressure
gauge

Open

Close

Vacuum

22 Room Air Conditioner

Panel Front Assembly

Panel Front Assembly (Artcool type Only)

1. First, Check the side cover
assembly exactly, Fix power cord
in the bottom groove of cover side
left.

2. Assemble connecting lead wire
with controller and first fix the
upper part of panel front, then
match the lower part of panel front

3. Suspend hook of front panel in the
groove after contract lower of 2
screws.

Panel Front

Connector

Installation Manual 23

ENGLISH

Test Running

Test Running

1. Check that all tubing and wiring have been properly connected.

2. Check that the gas and liquid side service valves are fully open.

Prepare remote control

Remove the battery cover by pulling it according to the arrow direction.
Insert new batteries making sure that the (+) and (–) of battery are installed correctly.
Reattach the cover by pushing it back into position.

:

• Use 2 AAA(1.5volt) batteries. Do not use rechargeable batteries.

• Remove the batteries from the remote control if the system is not

going to be used for a long time.

Evaluation of the performance

Operate unit for 15~20 minutes, then check the system refrigerant charge:

1. Measure the pressure of the gas side ser vice valve.

2. Measure the temperature of the intake and discharge of air.

3. Ensure the difference between the intake temperature and the discharge is
more than 8°C

4. For reference, the gas side pressure of optimum condition is as
below.(Cooling)

NOTICE

Discharge
temperature

Discharge air

Intake temperature

Discharge
temperature

Discharge air

Intake temperature

Discharge
temperature

Discharge air

Intake temperature

R-22 35°C (95°F) 4~5kg/cm2G(56.8~71.0 P.S.I.G.)

R-410A 35°C (95°F) 8.5~9.5kg/cm2G(120~135 P.S.I.G.)

Outside ambient

TEMP.

Refrigerant

The pressure of the gas side

service valve.

If the actual pressure are higher than shown, the
system is most likely over-charged, and charge should be
removed.If the actual pressure are lower than shown, the system
is most likely undercharged, and charge should be added.
The air conditioner is now ready for use.

NOTICE

PUMP DOWN

This is performed when the unit is to be relocated or
the refrigerant circuit is serviced.

Pump Down means collecting all refrigerant in the
outdoor unit without loss in refrigerant gas.

CAUTION: Be sure to perform Pump Down
procedure with the unit cooling mode.

Pump Down Procedure

1. Connect a low-pressure gauge manifold hose to the
charge port on the gas side service valve.

2. Open the gas side service valve halfway and purge the
air from the manifold hose using the refrigerant gas.

3. Close the liquid side service valve(all the way in).

4.Turn on the unit's operating switch and start the cooling
operation.

5.When the low-pressure gauge reading becomes 1 to

0.5kg/cm2G(14.2 to 7.1 P.S.I.G.), fully close the gas side
valve stem and then quickly turn off the unit.At that time,
Pump Down has been completed and all refrigerant gas
will have been collected in the outdoor unit.

Bolt

Tubing connection