LG LT-E1862HL, LT-E1820HL, LT-E2460CL, LT-E1860AA, LT-E2460HL Service Manual

Ceiling Cassette
Air Conditioner

SERVICE MANUAL

MODELS: LT-E1820CL/LT-E1820HL

LT-E1860CL/LT-E1860HL
LT-E1860AA
LT-E1862HL
LT-E2460CL/LT-E2460HL
LT-E2460BL
LT-E2462HL/LT-E2462CL
LT-E2460AA
LT-C182ELE0/LT-H182ELE0
LT-H246ELE0/ELF0
LT-C246ELE0/ELF0

Contents

Functions .................................................................................................................................3

Product Specifications (Cooling & Heating)..........................................................................7

Dimensions ..............................................................................................................................9

Refrigeration Cycle Diagram ................................................................................................12

Wiring Diagram ......................................................................................................................14

Operation Details ...................................................................................................................17

Installation of Indoor, Outdoor Unit .....................................................................................20

Cycle .......................................................................................................................................38

Cycle Troubleshooting Guide ...............................................................................................41

Electronic Parts Troubleshooting Guide .............................................................................42

Electronic Control Device .....................................................................................................45

Schematic Digram..................................................................................................................46

Exploded View and Replacement Parts List .......................................................................47

–2–

Functions

–3–

Indoor Unit

Operation ON/OFF by Remote controller

Sensing the Room Temperature

Room temperature control

Starting Current Control

Time Delay Safety Control

Indoor Fan Speed Control

Soft Dry Operation Mode

Airflow Direction Control

Auto Operation(Auto Change Over)

Deice (defrost) control (Heating)

Auto Restart

Hot-start Control (Heating)

• The indoor fan stops until the evaporator piping tempera­ture will be reached at 28°C.

Compact and light design

• To install a unit is very convenient because of smaller size
than textile. ( 600 x 600 )

Low noise

• The most advanced low-noise design.

• The adoption of turbo fan and round type heat exchanger
give the quietest operation.

Long life filter

• Long life wrinkle(type) and washable and anti-bacteria filter
is adopted.

Plasma Air Purifying Filter(2HL Only)

High head Drain pump

• Built-in drain pump automatically drains water.

• A standard drain-head height of up to 700mm is possible.

High-Ceiling corresponding Function

• According to the height of ceiling, the RPM of indoor fan
motor is selected to increase air reaching distance.

Central Control(Optional)

•

It is operating individually or totally by central control function.

Group Control(Optional Wiring)

Elevation Grille (Optional)

•

Each controller can control 16 units and 8 controllers can be
connected.

•

It operates maximum 16 units by only one wired remote con­troller and each unit starts sequentially to prevent overcurrent.

• Auto Elevation Grille is automatically down to height of max 3m.
So it enables to install the indoor unit at high celling space and
Auto Elevation Grille makes you clean the filter easily.

• Room temperature sensor. (Thermistor)

•

Maintains the room temperature in accordance with the Setting Temp.

• Indoor fan is delayed for 5 seconds at the starting.

• Restarting is inhibited for approx. 3 minutes.

• Jet, High, Med, Low

• Intermittent operation of fan at low speed.

• The louver can be set at swing up and down automatically.

• Although the air-conditioner is turned off by a power failure, it is restarted automati­cally previous operation mode after power supply.

• The setting temperature and desired operation mode are auto­matically set by fuzzy logic.

• Both the indoor and outdoor fan stops during defrosting.

• Hot start after defrost ends.

–4–

Remote Controller

Operation ON/OFF

Operation Mode Selection

Fan Speed Selection

Room Temperature Display

Temperature Setting

Setting the Timer

Weekly Program

(Cooling

model only)

(Heating

model only)

(Low) (Med) (High)

Cooling Operation Mode ( )
Heating Operation Mode ( ) Auto Operation Mode ( )

Soft Dry Operation Mode ( )

Fan Operation Mode

HI JET AUTOMEDLO

Program Holiday

SET/CLR

MinHour

Week

Timer CancelTimer Cancel

: High:39°C ↔ LOW:11°C

: Fan Operates without cooling & heating

Cooling Heating

Down to 18°C
Up to 30°C

Down to 16°C
Up to 30°C

–5–

■ ELEVATION GRILL (REMOTE CONTROLLER_Accessory)

• How to Use Remote Controller

• Main Components of Lift Grill

As for operation of Remote Controller, use it by directing the trans­mitter part of Remote Controller to the receiver part of front panel
directly under front panel.

• Do not drop it down or into water. Or else there is worry about
trouble failure.

• Do not press hard the Remote Controller button with nail (ball­point pen or other sharp substance). Or else there is worry
about trouble failure.

• In case when obstacle such as curtain hides the signal reception
part of receiver in between the space interval, Remote Controller
operation is infeasible.

➀ Lift grill front panel assembly
➁ Bolts for installation (4 EA, P/No. 3A00255K)
➂ Instruction manual
➃ Remote Controller for lift grill

Ascend

Signal transmitter

Descend

Stop

–6–

Automatic stop distance

✳

If you want to change automatic distance setting,
consult with your sale agency.

Automatic Stop Distance of Grill

Ceiling height Low

Medium

High

(

Height: 3~4 m)

Automatic stop distance

1.5±0.5m 2.5±0.5m 3.5±0.5m

- Depress the down button( ).
Then suction grill descends and stops automatically at a certain
distance.

- You may stop it at wanted distance point by depressing the stop but­ton ( ) when descending.

- Depress the up button( ).
Then suction grill goes up and enters into the front panel.

1. Stop the Air Conditioner Operation

2. Descend the Suction Grill

3. Raise the Suction Grill

- Depress the stop button( ).
Make use of this when you want to stop it at your wished posi­tion.

4. Stop the Suction Grill during Rising

• Always stop the air conditioner operation for safety before operating lift grill.

• Take heed _ there is worry about dust fall etc. when suction grill descends.

• In case when the set automatic stop distance goes wrong, check the set value of operation panel and con-

firm if there is neither obstacle nor mankind.

• When you are not to remove obstacle, stop the operation before touching the obstacle.

• How to Operate the Lift Grill

Model

1, 220-240, 50

4,536(5,274)

18,000

-

-

1,900

-

9.5

-

53

-

2.39

­13
50

1.9
O
X
4
O
O
O
O
O
4
O
X
O
O
O
O

Optional

O
O

1,900

570 x 570 x 269

670 x 670 x 30

870 x 655 x 320

19(16.5+2.5)

60

14:3*2.5

18:4*0.75

1/4(6.35mm)

5/8(15.88mm)

50
30

FoamPE/5mm

ø25/32

1, 220-240, 50

4,536(5,274)

18,000

-

-

1,900

-

9.5

-

53

-

2.39

­13
50

1.9
O
X
4
O
O
O
O
O
4
O
X
O
O
O
O

Optional

O
X

1,900

570 x 570 x 269

670 x 670 x 30

870 x 655 x 320

19(16.5+2.5)

60

14:3*2.5

18:4*0.75

1/4(6.35mm)

5/8(15.88mm)

50
30

FoamPE/5mm

ø25/32

1, 220-240, 50

4,536(5,274)

18,000

4,536(5,274)

18,000

2,050
1,850

9.5

9.0
53
53

2.21

2.85
13
50

1.9
O
O
4
O
O
O
O
O
4
O
O
O
O
O
O

Optional

O
X

1,800

570 x 570 x 269

670 x 670 x 30

870 x 655 x 320

19(16.5+2.5)

61

14:3*2.5

18:6*0.75

1/4(6.35mm)

5/8(15.88mm)

50
30

FoamPE/5mm

ø25/32

1, 220-240, 50

4,536(5,274)

18,000

4,536(5,274)

18,000

2,050
1,850

9.5

9.0
53
53

2.21

2.85
13
50

1.9
O
O
4
O
O
O
O
O
4
O
O
O
O
O
O

Optional

O
O

1,800

570 x 570 x 269

670 x 670 x 30

870 x 655 x 320

19(16.5+2.5)

61

14:3*2.5

18:6*0.75

1/4(6.35mm)

5/8(15.88mm)

50
30

FoamPE/5mm

ø25/32

1, 220, 60

4,536(5,274)

18,000

-

-

1,970

­9

-

53

-

2.30

­13
50

1.9
O
X
4
O
O
O
O
O
4
O
X
O
O
O
O

Optional

O
X

1,050

570 x 570 x 269

670 x 670 x 30

870 x 655 x 320

19
60

14:3*2.5

18:4*0.75

1/4(6.35mm)

5/8(15.88mm)

50
30

FoamPE/5mm

ø25/32

1, 220, 60

4,536(5,274)

18,000

4,536(5,274)

18,000

1,900
1,900

8.8

8.8
53
53

2.39

2.78
13
50

1.9
O
O
4
O
O
O
O
O
4
O
O
O
O
O
O

Optional

O
X

1,910

570 x 570 x 269

670 x 670 x 30

870 x 655 x 320

19
61

14:3*2.5

18:6*0.75

1/4(6.35mm)

5/8(15.88mm)

50
30

FoamPE/5mm

ø25/32

LT-E2460AA LT-E1860CL LT-E1860HL LT-E1862HL

LT-E1820CL

LT-C182ELE0

LT-E1820HL

LT-H182ELE0

Power Supply ø, V, Hz

Capacity Cooling kcal/h(W)

Btu/h

Heating kcal/h(W)

Btu/h

Input Cooling W

Heating W

Running Current Cooling A

Heating A

Starting Current Cooling A

Heating A
E.E.R kcal/h(W)
C.O.P W/W

Air Circulation Indoor m

3

/min

Outdoor m

3

/min

Moisture Removal l / h

Air-Flow Direction Control

Heating Operation Mode

Fan Speeds (steps)

Auto Operation (Changeover)

Forced Operation

Jet Cool

Soft Dry Operation

Timer Delay Safety Function

Feature Air Deflection (Way)

Self Diagnosis

Hot start

Auto Restart

Air refresh (Hole)

High Ceiling

Group Control (Optional wiring)

Central Control

Wired remote controller (with weekly Program)

Plasma A/Cleaner

Refrigerant(R-22) Charge g
Dimensions Indoor mm
(W x D x H) Panel mm

Outdoor mm

Net Weight Indoor kg

Outdoor kg

Main Power Cord AWG#:P*mm

2

Connection Cable AWG#:P*mm

2

Service Valve Liquid (inch)

Gas (inch)

Installation Pipe Length (m)

Elevation (m)

Insulation(material/thickness)

Drain Hose(I.D/O.D) mm

Product Specifications (Cooling & Heating)

–7–

–8–

Power Supply ø, V, Hz

Capacity Cooling kcal/h(W)

Btu/h

Heating kcal/h(W)

Btu/h

Input Cooling W

Heating W

Running Current Cooling A

Heating A

Starting Current Cooling A

Heating A
E.E.R kcal/h(W)
C.O.P W/W

Air Circulation Indoor m

3

/min

Outdoor m

3

/min

Moisture Removal l / h

Air-Flow Direction Control

Heating Operation Mode

Fan Speeds (steps)

Auto Operation (Changeover)

Forced Operation

Jet Cool

Soft Dry Operation

Timer Delay Safety Function

Feature Air Deflection (Way)

Self Diagnosis

Hot start

Auto Restart

Air refresh (Hole)

High Ceiling

Group Control (Optional wiring)

Central Control

Wired remote controller (with weekly Program)

Plasma A/Cleaner

Refrigerant(R-22) Charge g
Dimensions Indoor mm
(W x D x H) Panel mm

Outdoor mm

Net Weight Indoor kg

Outdoor kg

Main Power Cord AWG#:P*mm

2

Connection Cable AWG#:P*mm

2

Service Valve Liquid (inch)

Gas (inch)

Installation Pipe Length (m)

Elevation (m)

Insulation(material/thickness)

Drain Hose(I.D/O.D) mm

Model

LT-E2460CL

LT-C246ELE0

LT-E2460HL LT-E2460BL

LT-E2462HL

LT-H246ELE0/ELF0

LT-E2462CL
LT-E2460AA

1, 220-240, 50

5,871(6,827)

23,300

-

-

2,600

-

13.5

-

62

-

2.26

-

15.5
50

2.9
O
X

4
O
O
O
O
O

4
O
X
O
O
O
O

Optional

O
X

1,900

570 x 570 x 269

670 x 670 x 30

870 x 655 x 320

19(16.5+2.5)

61

14:3*2.5

18:4*0.75

1/4(6.35mm)

5/8(15.88mm)

50
30

FoamPE/5mm

ø25/32

1, 220-240, 50

5,871(6,827)

23,300

5,922(6,886)

23,500

2,600
2,600

13.5

13.5
62
60

2.26

2.65

15.5
50

2.9
O
O

4
O
O
O
O
O

4
O
O
O
O
O
O

Optional

O
X

1,900

570 x 570 x 269

670 x 670 x 30

870 x 655 x 320

19(16.5+2.5)

62

14:3*2.5

18:6*0.75

1/4(6.35mm)

5/8(15.88mm)

50
30

FoamPE/5mm

ø25/32

1, 220-240, 50

5,871(6,827)

23,300

5,922(6,886)

23,500

2,600
2,600

13.5

13.5
62
60

2.26

2.65

15.5
50

2.9
O
O

4
O
O
O
O
O

4
O
O
O
O
O
O

Optional

O
X

1,900

570 x 570 x 269

670 x 670 x 30

870 x 655 x 320

19(16.5+2.5)

62

14:3*2.5

18:6*0.75

1/4(6.35mm)

5/8(15.88mm)

50
30

FoamPE/5mm

ø25/32

1, 220-240, 50

5,871(6,827)

23,300

5,922(6,886)

23,500

2,600
2,600

13.5

13.5
62
60

2.26

2.65

15.5
50

2.9
O
O

4
O
O
O
O
O

4
O
O
O
O
O
O

Optional

O
O

1,900

570 x 570 x 269

670 x 670 x 30

870 x 655 x 320

19(16.5+2.5)

62

14:3*2.5

18:6*0.75

1/4(6.35mm)

5/8(15.88mm)

50
30

FoamPE/5mm

ø25/32

1, 220-240, 50

5,871(6,827)

23,300

-

-

2,600

-

13.5

-

62

-

2.26

-

15.5
50

2.9
O
X

4
O
O
O
O
O

4
O
X
O
O
O
O

Optional

O
O

1,900

570 x 570 x 269

670 x 670 x 30

870 x 655 x 320

19(16.5+2.5)

61

14:3*2.5

18:6*0.75

1/4(6.35mm)

5/8(15.88mm)

50
30

FoamPE/5mm

ø25/32

Dimensions

–9–

269

67055

570

269

190.5

160

52

90

90

120.4

30

521

670

570
450

40

110 110

670

670

CLOSE OPEN OPEN CLOSE

(1) Indoor Unit

–10–

LT-H***ELE0
LT-H***FLE0
LT-H***DLE0

W

D

H

W mm 670 850 950

Hmm909090
D mm 670 850 950

(unit : mm)

Model

LT-H***ELE0 LT-H***FLE0 LT-H***DLE0

DIM

Unit

(2) Outdoor Unit

–11–

Gas side
3-way valve

Liquid side
3-way valve

W

L6L7 L8 L9

L4

L11

L10

D

L1

L2

L5

L3

MODEL

DIM

W mm 870

H mm 655

D mm 320
L1 mm 370
L2 mm 25
L3 mm 340
L4 mm 630
L5 mm 25
L6 mm 546
L7 mm 162
L8 mm 162
L9 mm 54

L10 mm 74.5
L11 mm 79

All Models

Refrigeration Cycle Diagram

• HEAT PUMP

• Rated performance for refrigerant line length of: 7.5m

• If 18K Capacity is installed at a distance of 15m, 187.5g of refrigerant

should be added ....................................................(15-7.5)x25g

–12–

INDOOR UNIT

H/EX

Liquid SideLiquid SideGas Side

COMPRESSOR

VALVE REVERSING

ACCUM.

H/EX

Gas SideGas SideLiquid Side

CAPI C1

CAPI A

CAPI B

Heating Cooring

CAPI C2

(

OUTDOOR UNIT

GAS LIQUID

Elevation (m)

Length (m)

* Additional

refrigerant

(g/m)

Pipe Size

Rated Rated

Max. Max.

Capacity

18K 5/8" 1/4"

7.

550 5 30 25

24K 5/8" 1/4"

7.5 50 5 30 30

–13–

• COOLING ONLY

• Rated performance for refrigerant line length of: 7.5m

• If 18K Capacity is installed at a distance of 15m, 187.5g of refrigerant

should be added ....................................................(15-7.5)x25g

INDOOR UNIT

H/EX

Liquid SideLiquid SideLiquid Side

COMPRESSOR

ACCUM.

H/EX

Gas SideGas SideGas Side

CAPI C1

CAPI A

CAPI B

CAPI C2

OUTDOOR UNIT

GAS LIQUID

Elevation (m)

Length (m)

* Additional

refrigerant

(g/m)

Pipe Size

Rated Rated

Max. Max.

Capacity

18K 5/8" 1/4" 7.5 50 5 30 25
24K 5/8" 1/4" 7.5 50 5 30 30

Wiring Diagram

• HEAT PUMP

Model No.: LT-E1860HL/ LT-E1862HL/ LT-E2460HL/ LT-E2462HL/ LT-E2460BL

LT-H182ELEO/LT-H246ELE0/LT-H246ELF0

LT-E2460HL(Australia only)

–14–

OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM

COMP

R

S

H

42861

0

CF

BL

YL
OR
BK

TB2

BR

BR

BR

BR

BL

BL

BL

BL

BL

GN/YL

GN/YL

BK

BK

RD

CAPACITOR

REVERSING

VALVE

RD

C

POWER
RELAY

FAN

MOTOR

FUSE 5A

FUSE 5A

POWER

INPUT

TO INDOOR UNIT

TERMINAL

BLOCK

1(L)2(N

)

3(L)4(N

)

5

6

7

8

INDOOR

MOTOR

DRAIN

PUMP

STEP

MOTOR

TEMP.

THERMISTOR

PIPE

THERMISTOR

REMOTE

CONTROL

FLOAT S/W

CN - DISP

DISPLAY PCB

Only for LT-Exxx2HL

AIR

CLEANER

H.V. ASSY

DOOR S/W

TERMINAL

BLOCK

TO OUTDOOR UNIT

BR

YL

BK

OR

BL

BL

BR

GN/YL

RD

BK

YL

BL

GN

/

YL

OUT FAN

COMP

4 WAY

RD

BK

WH

RD
BK

3

(

L

)

4

(

N

)

5 6 7

FUSE T3.15A

OUTDOOR WIRING DIAGRAM

COMP

R

S

H

42861

0

CF

B

L

YL

YL

WH

YL

OR
BK

TB2

BR

BR

BR

BR

BL

BL

BL

BL

BL

BL

GN/YL

GN/YL

BK

BK

RD

CAPACITOR

S/CAPACITOR

REVERSING

VALVE

RD

C

POWER
RELAY

FAN

MOTOR

FUSE 5A

FUSE 5A

POWER

INPUT

TO INDOOR UNIT

TERMINAL

BLOCK

3854A20119A

1(L)2(N

)

3(L)4(N

)

5

6

7

8

3

RY­COMP

RY­S/CAPA

CN-POWER

434

–15–

• COOLING ONLY

Model No.: LT-E1860CL/LT-E1860AA/LT-C182ELE0

Model No.: LT-E2460CL/LT-E2462CL/LT-E2460AA/LT-C246ELE0

OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM

INDOOR

MOTOR

DRAIN

PUMP

STEP

MOTOR

TEMP.

THERMISTOR

PIPE

THERMISTOR

REMOTE

CONTROL

FLOAT S/W

CN - DISP

DISPLAY PCB

TERMINAL

BLOCK

TO OUTDOOR UNIT

BR

YL

BK

OR

BL

BL

BR

GN/YL

RD

BL

GN

/

YL

COMP

3

(

L

)

4

(

N

)

5 6 7

FUSE T3.15A

COMP

R

S

H

42861

0

CF

BL

YL
OR
BK

TB2

BR

BR

BR

BR

BL

BL

BL

BL

BL

GN/YL

GN/YL

BK

RD

CAPACITOR

RD

C

POWER
RELAY

FAN

MOTOR

FUSE 5A

FUSE 5A

POWER

INPUT

TO INDOOR UNIT

TERMINAL

BLOCK

1(L)2(N

)

3(L)4(N

)

5

6

7

8

OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM

INDOOR

MOTOR

DRAIN
PUMP

STEP

MOTOR

TEMP.

THERMISTOR

PIPE

THERMISTOR

REMOTE

CONTROL

FLOAT S/W

CN - DISP

DISPLAY PCB

LT-E

***

2

HL ONLY

AIR

CLEANER

H.V. ASSY

DOOR S/W

TERMINAL

BLOCK

TO OUTDOOR UNIT

BR

YL

BK

OR

BL

BL

BR

GN/YL

RD

YL

BL

GN

/

YL

COMP

RD

BK

WH

RD
BK

3(L) 4(N)

5 6 7

FUSE T3.15A

OUT FAN

COMP

R

S

H

42861

0

CF

BL

YL
OR
BK

TB2

BR

BR

BR

BR

BL

BL

BL

BL

BL

GN/YL

GN/YL

BK

RD

CAPACITOR

RD

C

POWER
RELAY

FAN

MOTOR

FUSE 5A

FUSE 5A

POWER

INPUT

TO INDOOR UNIT

TERMINAL

BLOCK

1(L)2(N

)

3(L)4(N

)

5

6

7

8

–16–

■ ELEVATION GRILL WIRING DIAGRAM (INDOOR)

LT-H***DLE0/LT-C***DLE0

LT-H***ELE0/LT-C***ELE0
LT-H***FLE0/LT-C***FLE0

–17–

Operation Details

(1) The function of main control

1. Time Delay Safety Control

• 3min The compressor is ceased for 3minutes to balance the pressure in the refrigeration cycle.
(Protection of compressor)

• 5sec

Vertical air flow direction control louvers open in 5 seconds to prevent noise between louvers and wind.

• 30sec The 4-way valve is ceased for 30sec. to prevent the refrigerant-gas abnormal noise when the Heating

operation is OFF or switched to the other operation mode while compress is off.
While compressor is running, it takes 3~5 seconds to switch.

2. Auto Swing Control

• This function is to swing the louver up and down automatically.

3. Air-Filter Checking Control

• 'Filter' will display in the remote controller display and main body display when an air-filter is polluted. Then clean

the air-filter for reference to Owners Manual.

4. Soft-Dry Operation

• The indoor fan speed is automatically set to the low, so the shift of the indoor fan speed is impossible because of

already being set to the best speed for Dry Operation by Micom Control.

5. Cooling Mode Operation

• When selecting the Cooling( ) Mode Operation, the unit will operate according to the setting by the remote con-

troller and the operation diagram is as following

Intake Air temp.

SET TEMP.+0.5°C
(COMP. ON)

SET TEMP. -0.5°C
(COMP. OFF) More than More than

3 minutes 3 minutes

Selecting Selecting Selecting

fan speed fan speed fan speed

COMPRESSOR ON OFF ON OFF ON

INDOOR FAN Low Low

–18–

Intake Air temp.

Setting temp.+3°C

(Compressor OFF)

Setting temp.
(Compressor ON)

INDOOR FAN

COMPRESSOR ON OFF ON OFF

A point; While the indoor Heat-Exchanger temperature is higher than 40°C fan operates at low speed, when

it becomes lower than 40˚C fan stops.

B point; When the indoor Heat-Exchanger temperature is higher than 42°C, fan operates at selected fan

speed, when it becomes lower than 39°C, the fan operates at low speed.

6. Heating Mode Operation

The unit will operate according to the setting by the remote controller and the operation diagram is shown as follows.

(Hot Start)

Low

OFF

Selected

Fan Speed

minimum 3min

Selecting fan

speed

LowLowLow OFF OFF

minimum

10sec.

1min

A

A

minimum

1min.

minimum

10sec.

B

7. Hot-Start Control

• The indoor fan stops until the evaporator piping temperature reaches to 25°C.

• If the evaporator piping temperature drops below 22°C, indoor fan stops again.

• The operation diagram is as follows.

PIPING
TEMPERATURE

1min

COMPRESSOR

INDOOR FAN

ON

OFF LOW

Selected

fan speed

22°C

25°C