LG LSU301CE Owner's manual

Brand: LG

Model: LSU301CE

Category: Split-system air conditioners

Type: Owner's manual

Room Air Conditioner

SVC MANUAL(Exploded View)

CAUTION

Before Servicing the unit, read the safety precautions in General SVC manual.

Only for authorized service personnel.

Internal Use Only

http://biz.lgservice.com

MODEL : LS301HE

LS301CE

- 2 -

Only for training and service purposes

LGE Internal Use Only

Air Conditioner Service Manual

TABLE OF CONTENTS

Safety Precautions..........................................................................................................................................3

Dimensions......................................................................................................................................................8

Symbols Used in this Manual.....................................................................................................................8

Indoor Unit..................................................................................................................................................8

Outdoor Unit...............................................................................................................................................9

Product Specifications .................................................................................................................................10

Installation .....................................................................................................................................................12

Piping Length and Elevation.....................................................................................................................12

How to Fix Installation Plate.....................................................................................................................13

Drill a Hole in the Wall ..............................................................................................................................13

Flaring work and connection of piping .......................................................................................................14

Flaring work..............................................................................................................................................14

Connection of piping-Indoor .....................................................................................................................15

Connection of the drain hose ...................................................................................................................20

Connection of piping-Outdoor ..................................................................................................................20

Connecting the cable between indoor unit and outdoor unit ...................................................................21

Connect the cable to the Indoor unit. .......................................................................................................21

Connect the cable to the outdoor unit ......................................................................................................22

Checking the drainage and forming the pipings........................................................................................23

Checking the drainage .............................................................................................................................23

Form the piping ........................................................................................................................................24

AIR PURGING ................................................................................................................................................25

Air purging................................................................................................................................................25

Test Running .................................................................................................................................................27

Operation .......................................................................................................................................................28

Operation .................................................................................................................................................28

Functions..................................................................................................................................................28

The function of main control.....................................................................................................................30

Display Function ......................................................................................................................................36

Self-diagnosis Function............................................................................................................................36

Name and Function-Remote Control (Cooling Models) ...........................................................................37

Name and Function-Remote Control (Heat Pump Models) ....................................................................38

Disassembly ..................................................................................................................................................39

Indoor Unit................................................................................................................................................39

Schematic Diagram.......................................................................................................................................43

Heat Pump/Cooling Only Series(Indoor Unit) ..........................................................................................43

Heat Pump Series (Outdoor Unit) ............................................................................................................44

INDOOR UNIT P.W.B. ASSEMBLY ..........................................................................................................45

OUTDOOR UNIT P.W.B. ASSEMBLY ......................................................................................................46

DISPLAY P.W.B. ASM ..............................................................................................................................47

Wiring Diagram.........................................................................................................................................48

Troubleshooting Guide .................................................................................................................................48

Refrigeration Cycle Diagram ....................................................................................................................50

Pipe length and the elevation ...................................................................................................................51

3-way Valve ..............................................................................................................................................52

Cycle Parts...............................................................................................................................................57

Electronic Parts ........................................................................................................................................58

Exploded View...............................................................................................................................................68

- 3 -

Only for training and service purposes

LGE Internal Use Only

Safety Precautions

To prevent injury to the user or other people and property damage, the following instructions must

be followed.

■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is

classified by the following indications.

■ Meanings of symbols used in this manual are as shown below.

This symbol indicates the possibility of death or serious injury.

This symbol indicates the possibility of injury or damage to properties only.

Be sure not to do.

Be sure to follow the instruction.

Do not use damaged power cords, plugs, or a

loose socket.

Always use the power plug and socket with the

ground terminal.

• There is risk of fire of electric shock. • There is risk of electric shock.

Install the panel and the cover of control box

securely.

.Do not modify or extend the power cord.

• There is risk of fire of electric shock. • No grounding may cause electric shock.

■ Installation

- 4 -

Only for training and service purposes

LGE Internal Use Only

Safety Precautions

Do not install the product on a defective instal-

lation stand.

Be sure the installation area does not

deteriorate with age.

• It may cause injury, accident, or damage to the

product.

• If the base collapses, the air conditioner could fall

with it, causing property damage, product failure,

and personal injury.

• Sharp edges could cause injury. Be especially care-

ful of the case edges and the fins on the condenser

and evaporator.

•

There is risk of fire, electric shock, explosion, or injury.

Be cautious when unpacking and installing the

product.

For installation, always contact the dealer or

an Authorized service center

For re-installation of the installed product,

always contact a dealer or an authorized ser-

vice center.

Do not install, remove, or re-install the unit by

yourself.

• There is risk of fire, electric shock, explosion, or

injury.

• There is risk of fire, electric shock, explosion, or

injury.

- 5 -

Only for training and service purposes

LGE Internal Use Only

Safety Precautions

■ Operation

Do not turn the air-conditioner ON or OFF by

plugging or unplugging the power plug.

Use a dedicated outlet for this appliance.

• There is risk of fire or electrical shock. • There is risk of fire or electrical shock.

Grasp the plug to remove the cord from the

outlet. Do not touch it with wet hands.

Do not place a heater or other appliances near

the power cable.

• There is risk of fire or electrical shock. • There is risk of fire and electric shock.

Do not allow water to run into electrical parts. Do not store or use flammable gas or com-

bustibles near the air conditioner.

• There is risk of fire, failure of the product, or electric

shock.

• There is risk of fire or failure of product.

Wax

Thinner

- 6 -

Only for training and service purposes

LGE Internal Use Only

Always check for gas (refrigerant) leakage after

installation or repair of product.

Install the drain hose to ensure that water is

drained away properly.

• Low refrigerant levels may cause failure of product. • A bad connection may cause water leakage.

Keep level even when installing the product. Use two or more people to lift and transport

the air conditioner.

• To avoid vibration or water leakage. • Avoid personal injury.

■ Installation

90˚

Unplug the unit if strange sounds, odors, or

smoke comes from it.

Be cautious that water could not enter the

product.

• There is risk of electric shock or fire. • There is risk of fire, electric shock, or product dam-

age.

Safety Precautions

- 7 -

Only for training and service purposes

LGE Internal Use Only

Use a soft cloth to clean. Do not use harsh

detergents, solvents, etc.

Do not touch the metal parts of the product

when removing the air filter. They are very

sharp!

• There is risk of fire, electric shock, or damage to the

plastic parts of the product.

• There is risk of personal injury.

Do not step on or put anyting on the product.

(outdoor units)

Do not insert hands or other objects through

the air inlet or outlet while the air conditioner

is plugged in.

• There is risk of personal injury and failure of product. • There are sharp and moving parts that could cause

personal injury.

■ Operation

Wax

Safety Precautions

- 8 -

Only for training and service purposes

LGE Internal Use Only

Dimensions

Tubing hole cover

Installation plate

Indoor Unit

This symbol alerts you to the risk of electric shock.

This symbol alerts you to hazards that could cause harm to the

air conditioner.

This symbol indicates special notes.

NOTICE

Symbols Used in this Manual

mm(inch)

1,259(49.6)

mm(inch)

349(13.7)

mm(inch)

205(8.1)

Model

Dimension

30k SERIES

- 9 -

Only for training and service purposes

LGE Internal Use Only

Dimensions

Outdoor Unit

MODEL

DIM

L7 L6 L8 L9

L10L11

L4L5

Gas side

3-way valve

Liquid side

3-way valve

W mm(in ch) 870(34.3)

H mm(in ch) 800(31.5)

D mm(in ch) 320(12.6)

L1 mm(in ch) 370(14.6)

L2 mm(in ch) 340(13.4)

L3 mm(in ch) 25(1.0)

L4 mm(in ch) 775(30.5)

L5 mm(in ch) 25(1.0)

L6 mm(in ch) 546(21.5)

L7 mm(in ch) 162(6.4)

L8 mm(in ch) 162(6.4)

L9 mm(in ch) 54(2.1)

L10 mm(in ch) 74.5(2.9)

L11 mm(in ch) 79(3.1)

30k SERIES

- 10 -

Only for training and service purposes

LGE Internal Use Only

Product Specifications

Cooling Only

Items Unit LS301CE

Power Supply ø, V, Hz 230/208,60

Cooling Capacity BTU/h 28,000/27,000

Input W 3,600/3,450

Running Current A 16.0/16.5

COMP. Locked Rotor AMP. A 68

E.E.R BTU/hW 7.81/7.79

Air Circulation m

/min(cfm) 21(740)

Moisture Removal l/h(pts/hr) 3.7(7.8)

Noise Level Indoor, High dB(A) 49

(Sound Med dB(A) 46

Pressure, 1m) Low dB(A) 43

Outdoor, Max dB(A) 63

Features Temperature Control Thermistor

Air Deflection 4-way

Steps, Fan/Cool 3/3

Airflow Direction Control(up&down) Auto

Airflow Direction Control(left&right) Manual

Remocon Type Wireless LCD

Setting Temperature Range, Cooling Mode 64~86°F

Temperature Increment 2°F

Auto Operation(electronic control) Yes

Self Diagnosis Yes

Timer 24hr, On/Of

Sleep Operation Yes

Healthy Dehumidification Mode Yes

Restart Delay minutes 3

Refrigerant(R-22) Charge g(oz) 2550(89.9)

Power cord AWG #: P*mm

12:3*2.5

Fuse or breaker Capacity A 30A

Connecting Cable AWG #: P*mm

16:4*0.75

Connecting Tube Liquid Side mm(in) 6.35(1/4)

(ø. Socket Flare) Gas Side mm(in) 12.7(1/2)

Length, std m(ft) 7.62(25)

Additional Drain Hose(Outer Dia.) mm(in) 15.5(5/8)

Dimensions Indoor mm 1259*349*205

(WxHxD) in 49.6*13.7*8.1

Outdoor mm 870*800*320

in 34.3*31.5*12.6

Net Weight Indoor kg(lbs) 20

Outdoor kg(lbs) 71

* Design and Specifications subject to change without prior notice for product improvement.

- 11 -

Only for training and service purposes

LGE Internal Use Only

Product Specifications

Cooling & Heating

Items Unit LS301HE

Power Supply ø, V, Hz 1,230/208,60

Cooling Capacity BTU/h 28,000/27,000

Heating Capacity BTU/h 29,000/28,000

Input Cooling W 3,600/3,450

Heating W 3,750/3,550

Running Current Cooling A 16.0/16.5

Heating A 16.5/17.0

COMP. Locked Cooling A 68

Rotor AMP. Heating A 68

E.E.R BTU/hW 7.78/7.82

C.O.P 2.26/2.30

Air Circulation m

/min(cfm) 21(740)

Moisture Removal l/h(pts/hr) 3.7(7.8)

Noise Level Indoor, High dB(A) 49

(Sound Med dB(A) 46

Pressure, 1m) Low dB(A) 43

Outdoor, Max dB(A) 63

Features Temperature Control Thermistor

Air Deflection 4-way

Steps, Fan/Cool/Heat 3/3/3

Airflow Direction Control(up&down) Auto

Airflow Direction Control(left&right) Manual

Remocon Type Wireless LCD

Setting Temperature Range, Cooling Mode

64~86°F

Heating Mode 60~86°F

Temperature Increment 2°F

Auto Operation(electronic control) Yes

Self Diagnosis Yes

Timer 24hr, On/Off

Sleep Operation Yes

Healthy Dehumidification Mode Yes

Restart Delay minutes 3

Defrost Control Yes

Hot Start Yes

Refrigerant(R-22) Charge g(oz) 2550(89.9)

Power cord AWG #: P*mm

12:3*2.5

Fuse or breaker Capacity A 30A

Connecting Cable AWG #: P*mm

18:4*0.75

Connecting Tube Liquid Side mm(in) 9.52(3/8)

(ø. Socket Flare) Gas Side mm(in) 15.88(5/8)

Length, std m(ft) 7.62(25)

Additional Drain Hose(Outer Dia.) mm(in) 15.5(5/8)

Dimensions Indoor mm 1259*349*205

(WxHxD) in 49.6*13.7*8.1

Outdoor mm 770*540*245 870*800*320

in 34.3*31.5*12.6

Net Weight Indoor kg(lbs) 20

Outdoor kg(lbs) 33(72.8) 71

* Design and Specifications subject to change without prior notice for product improvement.

- 12 -

Only for training and service purposes

LGE Internal Use Only

Installation

Selection of the Best Location

Piping length and elevation

Installation Parts Provided

1. Indoor unit

■ Do not have any heat or steam near the unit.

■ Select a place where there are no obstacles in front

of the unit.

■ Make sure that condensation drainage can be con-

veniently routed away.

■ Do not install near a doorway.

■ Ensure that the space around the left and right of

the unit is more than 30cm(12"). The unit should be

installed as high on the wall as possible, allowing a

minimum of 12cm(4.8") from ceiling.

■ Use a stud finder to locate studs to prevent unnec-

essary damage to the wall.

2. Outdoor unit

■

If an awning is built over the unit to prevent direct sunlight or

rain exposure, make sure that heat radiation from the con-

denser is not restricted.

■

Ensure that the space around the back and sides is more than

10cm(4"). The front of the unit should have more than

70cm(28") 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 con-

ditioner 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.

If the outdoor unit is installed on root structures or walls,

this may result in excessive noise and vibration, and

maybe also classed as non serviceable installation.

More than

12cm(4.8")

More than

30cm(12")

More than

30cm(12")

More than 2.3m(7.5ft)

More than

10cm(4")

More than

10cm(4")

More than

60cm(24")

More than

60cm(24")

More than

70cm(28")

In case more than 5m(16.4ft)

Outdoor unit

Indoor unit

Oil trap

Outdoor unit

Indoor unit

Install the indoor unit on the wall where the height

from the floors more than 2.3meters(7.5ft).

A minimum pipe run of 7.5meters(25ft) is required to

minimise vibration & excessive noise.

CAUTION

30k 5/8" 3/8" 7.5(25) 15(50) 30(100)

30(1.102

)

Pipe Size

Capacity

(Btu/h)

GAS LIQUID

Max.

length

A m(ft)

Additional

Refrigerant

g/m(oz/ft)

Max.

Elevation

B m(ft)

Standard

Length

m(ft)

1. Type "A" screw

2. Installation Plate

3. Type "B" screw

4. Holder Remote Control

- 13 -

Only for training and service purposes

LGE Internal Use Only

Installation

How to fix installation plate Drill a hole in the wall

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 con-

nections must be done safely.

5-7mm

(0.2~0.3")

Indoor

WALL

Outdoor

Installation Plate

Type "A" screw

(+1 D4.0 L38.0 MSR3/FZW)

30K

Right rear pipingLeft rear piping

50mm(2.0")

70mm(2.76")180mm

(7.2")

115mm(4.5in)

■ Drill the piping hole with a ø70mm (0.76") hole

core drill. Drill the piping hole at either the right or

the left with the hole slightly slanted to the out-

door side.

- 14 -

Only for training and service purposes

LGE Internal Use Only

Flaring work and connection of piping

Flaring work

Main cause for gas leakage is due to defect in flar-

ing work. Carry out correct flaring work in the follow-

ing procedure.

1. Cut the pipes and the cable.

■ Use the piping kit accessory or the pipes

purchased locally.

■ Measure the distance between the indoor and the

outdoor unit.

■ Cut the pipes a little longer than measured

distance.

■ Cut the cable 1.5m(59.1") longer than the pipe

length.

2. Burrs removal

■ Completely remove all burrs from the cut cross

section of pipe/tube.

■ Put the end of the copper tube/pipe in a down-

ward direction as you remove burrs in order to

avoid dropping burrs into the tubing.

3. Putting nut on

■ Remove flare nuts attached to indoor and outdoor

unit, then put them on pipe/tube having complet-

ed burr removal.

(not possible to put them on after flaring work)

Copper

pipe

90°

Slanted Uneven Rough

Bar

Copper pipe

Clamp handle

Red arrow mark

Cone

Yoke

Handle

Bar

"A"

Pipe

Reamer

Point down

4. 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.

5. 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.

mm inch mm

ø6.35 1/4 0 ~ 0.5

ø9.52 3/8 0 ~ 0.5

ø12.7 1/2 0 ~ 0.5

ø15.88 5/8 0 ~ 1.0

Outside diameter A

Flare nut

Copper tube

Inclined

Inside is shiny without scratches

Smooth all round

Even length

all round

Surface

damaged

Cracked Uneven

thickness

= Improper flaring =

- 15 -

Only for training and service purposes

LGE Internal Use Only

Flaring work and connection of piping

Connection of piping-Indoor

1. Remove the 2 screws of right side panel.

2. Remove the front right side panel by the arrow.

■ The connector can be disconnected by pulling it

while pressing the connector's hook.

■ Remove the 1 screw for fixing lower panel.

3. Remove the lower panel by the arrow.

■ Take care not to scratch the wall and mat to

drop.

1. Route the indoor tubing and the drain hose in the

direction of rear left.

2. 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.

Right side panel

Drain hose

Main PCB

Lower panel

For left rear piping

CAUTION

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.

- 16 -

Only for training and service purposes

LGE Internal Use Only

Flaring work and connection of piping

3. 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.

3. 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.

NOTE: If the drain hose is routed inside the room,

insulate the hose with an insulation material*

so that dripping from "sweating"(condensa-

tion) will not damage furniture or floors.

*Foamed polyethylene or equivalent is rec-

ommended.

4. Indoor unit installation

■ Hook the indoor unit onto the upper portion of the

installation plate.(Engage the three hooks of the

rear top and rear lower of the indoor unit with the

upper edge and lower edge of the installation

plate.) Ensure that the hooks are properly seated

on the installation plate by moving it left and right.

5. Connecting the pipings to the indoor unit and drain

hose to drain pipe.

■ Align the center of the pipings and sufficiently

tighten the flare nut by hand.

■ Tighten the flare nut with a wrench.

■ When extending the drain hose at the indoor unit,

install the drain pipe.

Connecting

cable

Loop

Gas side

piping

Liquid side

piping

Drain hose

Installation

plate

Three upper

hooks

Installation plate

Indoor unit

Three lower

hooks

Setting line

Indoor unit tubing Flare nut Pipings

Connection pipe

Flare nut

Indoor unit tubing

Torque wrench

Spanner (fixed)

Vinyl tape(narrow)

Adhesive

Drain pipe

Indoor unit drain hose

Pipe Size[Torque]

Capacity

(Btu/h)

Suction Evaporator

30K 5/8"[6.6kg.m] 3/8"[4.2kg.m]

- 17 -

Only for training and service purposes

LGE Internal Use Only

Flaring work and connection of piping

6. 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 pip-

ing housing section with vinyl tape.

■ Bundle the piping and drain hose together by

wrapping them with vinyl tape over the range with-

in which they fit into the rear piping housing sec-

tion.

1. Route the indoor tubing and the drain hose to the

required piping hole position.

2. Insert the piping, drain hose and the connecting

cable into the piping hole.

3. Insert the connecting cable into the indoor unit.

■ Don't connect the cable to the indoor unit.

■ Make a small loop with the cable for easy

connection later.

4. Tape the drain hose and the connecting cable.

• Connecting cable

Plastic bands

Insulation material

Drain hose

Drain pipe

Connecting cable

Vinyl tape(narrow)

Connection

pipe

Connecting cable

Vinyl tape

(wide)

Wrap with vinyl tape

Indoor

unit pipe

Pipe

Wrap with vinyl tape

Drain hose

Pipe

Vinyl tape(wide)

For right rear piping

- 18 -

Only for training and service purposes

LGE Internal Use Only

Flaring work and connection of piping

5. Indoor unit installation

■ Hook the indoor unit onto the upper portion of the

installation plate.(Engage the three hooks of the

rear top and rear lower of the indoor unit with the

upper edge and lower edge of the installation

plate.) Ensure that the hooks are properly seated

on the installation plate by moving it left and right.

6. Connecting the pipings to the indoor unit and the

drain hose to drain pipe.

■ Align the center of the pipings and sufficiently

tighten the flare nut by hand.

■ Tighten the flare nut with a wrench.

■ When extending the drain hose at the indoor unit,

install the drain pipe.

7. Wrap the insulation material around the connecting

portion.

■

Overlap the connection pipe heat insulation and the

indoor unit pipe heat insulation material. Bind them

together with vinyl tape so that there is no gap.

■ Wrap the area which accommodates the rear

piping housing section with vinyl tape.

Installation

plate

Three upper

hooks

Installation plate

Indoor unit

Three lower

hooks

Setting line

Vinyl tape

Adhesive

Drain hose

Indoor unit drain hose

(narrow)

Plastic bands

Insulation material

Vinyl tape(narrow)

Connection

pipe

Connecting cable

Indoor

unit piping

Pipe

Vinyl tape

(wide)

Wrap with vinyl tape

Indoor unit tubing Flare nut Pipings

Torque wrench

Indoor unit tubing

Spanner (fixed)

Connection pipe

Flare nut

Pipe Size[Torque]

Capacity

(Btu/h)

Suction Evaporator

30k 5/8"[6.6kg.m] 3/8"[4.2kg.m]

- 19 -

Only for training and service purposes

LGE Internal Use Only

Flaring work and connection of piping

■ Bundle the piping and drain hose together by

wrapping them with cloth tape over the range

within which they fit into the rear piping housing

section.

8. Reroute the pipings and the drain hose across the

back of the chassis.

9. Reinstall the parts to the original position.

■ Refix the lower panel to the original position.

■ Connect display conductor.

■ Refix the front right side panel to the original

position with the two screws.

Drain hose

Vinyl tape(narrow)

Pipe

Wrap with

vinyl tape(wide)

Lower panel

Main PCB

Piping for

passage through

piping hole

- 20 -

Only for training and service purposes

LGE Internal Use Only

Flaring work and connection of piping

■ The drain hose can be connected at two different

positions. Use the most convenient position and, if

necessary, exchange the position of the drain

pan, rubber cap and the drain hose.

➊ Drain pan

➋ Rubber cap

➌ Drain hose

➍ Exchange if necessary

■ Remove the drain hose.

■ Securely insert both the rubber plug and drain

hose into the drain outlets.

Be sure the rubber the cap is securely fastened

so that there is no leakage.

1. Align the center of the pipings and sufficiently

tighten the flare nut by hand.

2. 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.

Outdoor unit

Gas side piping

(Bigger diameter)

Liquid side

piping

(Smaller

diameter)

Torque wrench

Pipe Size[Torque]

Capacity

(Btu/h)

Suction Evaporator

30K 5/8"[6.6kg.m] 3/8"[4.2kg.m]

Connection of the drain hose Connection of piping-Outdoor

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LG LSU301CE Owner's manual

Brand: LG

Model: LSU301CE

Category: Split-system air conditioners

Type: Owner's manual

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LG LSU301CE Owner's manual

LG LSU301CE Owner's manual

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