LG LB-E4880HL Manuale utente

Ceiling Duct Air Conditioner

SVC MANUAL(Exploded View)

MODEL : LB-E4880HL

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

Contents

Functions 3

Product Specifications (Cooling & Heating) 5

Dimensions 6

Refrigeration Cycle Diagram 7

Wiring Diagram 8

Operation Details 9

Installation of Indoor, Outdoor Unit 12

Test Running 23

3-way Valve 25

Cycle Troubleshooting Guide 30

Electronic Parts Troubleshooting Guide 31

Electronic Control Device 34

Schematic Diagram 35

Exploded View 36

- 2 -

Only for training and service purposes LGE Internal Use Only

Functions

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.

High, Med, Low

Intermittent operation of fan at low speed.

The setting temperature, indoor fan speed and desired operation mode are automatically set.

Both the indoor and outdoor fan stops during defrosting.

Hot start after defrost ends.

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

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

Deice (defrost) control (Heating)

Hot-start Control (Heating)

Auto Operation

- 3 -

Only for training and service purposes LGE Internal Use Only

- 4 -

Only for training and service purposes LGE Internal Use Only

Remote Controller

Operation ON/OFF

Operation Mode Selection

Fan Speed Selection

Room Temperature Display

Temperature Setting

Setting the Time or Timer

(Cooling

model only) (Heating

model only)

(Low) (Med) (High)

Cooling Operation Mode ( )

Heating Operation Mode ( )

Soft Dry Operation Mode ( )

Fan Operation Mode

HIMEDLO

Set

: High:39°CLOW: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

When the air conditioner is turned off by a power failure, it is restarted

automatically after a power resupply.

✓

- 5 -

Only for training and service purposes LGE Internal Use Only

Product Specifications (Cooling & Heating)

Model Name

Volt

Item Unit

Cooling Capacity Btu/h(W)

Heating Capacity Btu/h(W)

Power Source , V, Hz

Indoor

Outdoor

Input Cooling

Heating

Running Current Cooling

Heating

E.E.R. Btu/h-W

Indoor

Outdoor

Indoor

Outdoor

Refrigerant (R-22) g

Remocon Type

Liquid

Gas

Drain Hose

Connecting Wire

Main Power Cable

Time Delay Safety Function

Soft Dry

Fan Speed (Indoor)

Timer

Self-Diagnosis

Air Circulation m3/min

Dimensions

(W H D)

Net. Weight

LB-E4880HL

380-415V

Service Valve &

Connecting Tube

48,000 (12,090)

3ø380-415V~, 50Hz

105

6,000

5,500

8.0

1,230 x 370 x 680

900 x 1,220 x 370

5,000

L.C.D

1/2" (12.7)

3/4" (19.05)

1.25mm2

2.5mm2

3 (Hi, Med, Low)

24Hrs

- 6 -

Only for training and service purposes LGE Internal Use Only

Dimensions

MODEL:LB-E4880HL

Indoor Unit

900

1220

370

1230 680

370

Outdoor Unit

- 7 -

Only for training and service purposes LGE Internal Use Only

Refrigeration Cycle Diagram

• MODEL: LB-E4880HL

(Rated performance for refrigerant line length of: 5m)

For installation over rated distance, 70g of refrigerant should be added for each meter.

ex) When installed at a distance of 15m, 525g of refrigerant should be added.

(15-7.5) x 70g = 525g

Pipe size(Diameter: ø) Piping length(m) Elevation(m)

MODEL

Gas Liquid Rated Max. Rated Max.

LB-E4880HL 3/4" 1/2" 5 30 5 30 70

INDOOR UNIT OUTDOOR UNIT

HEAT

EXCHANGER HEAT

EXCHANGER

COMPRESSOR

GAS SIDE

LIQUID SIDE

COOLING

HEATING

REVERSING

VALVE

CHECK VALVE

CAPILLARY TUBE

Additional

refrigerant

(g/m)

Wiring Diagram

MODEL: LB-E4880HL

• Indoor Unit

• Outdoor Unit

- 8 -

Only for training and service purposes LGE Internal Use Only

FMi

TRANS

GN/YLGN/YL

CN-TRANS2

PWB ASM

CN-POWER

CN-TRANS1

Hi Med Low

CN-MOTOR

RY-FAN

RY-4WAY

RY-COMP

CN-OUT

DC-12V

SIGNAL

GND

Remo.

CN-REMO

INDOOR ELECTRIC CIRCUIT

INDOOR UNITOUTDOOR UNIT

(RD)

(YL)

(BR)

P/NO : 3854A90021R

COi

GN/YL

CN-TH

EVA

ROOM

TH1

RTM

3Ø, 380-415V, 50Hz

POWER SUPPLY

STN

63H2

D.P CTH

TNS NO NC

BK 52F1

52C 1

T/B1

T/B2

FMo

49FMo

FMo

49FMo

YL BK

T2 T1

YL BK

CH BK

Co Co

20SV

NOTE

BL : BLUE

BK : BLACK

OR : ORANGE

GN/YL : GREEN/YELLOW

RD : RED

WH : WHITE

YL : YELLOW

Outdoor Unit Wiring Diagram

RTM

3Ø, 380-415V, 50Hz

POWER SUPPLY

STN

WH WH

63H2

D.P CTH

TNS NO NC

BK 52F1

52C 1

T/B1

T/B2

FMo

49FMo

FMo

49FMo

YL BK

T2 T1

YL BK

Co Co

20SV

GN/YL

TMo

To the indoor unit

WHWH YL

63H2

C TH

49FMo

20SV

HIGH PRESSURE SWITCH FOR HEATING

THERMISTOR FOR PIPE TEMP.

INTERNAL T.P FOR FMo

REVERSING COIL

COMPRESSOR

52C

52F1

D.P

MAGNECTIC CONTACTOR

MAIN TERMINAL BLOCK

RELAY FOR FMo

DEICER PCB

CRANKCASE HEATER

FMo

TMo

RUN CAPACITOR FOR FMo

OUTDOOR FAN MOTOR

FUSE (250V,10A)

TERMINAL BLOCK

P/NO : 3854A90021S

- 9 -

Only for training and service purposes LGE Internal Use Only

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)

•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. 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.

3. 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.

COMP. ON

(SET TEMP.+0.5°C)

COMP. OFF

(SET TEMP. -0.5°C) 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

- 10 -

Only for training and service purposes LGE Internal Use Only

Intake Air temp.

Setting temp.+3°C

(Compressor OFF)

Setting temp.

(Compressor ON)

INDOOR FAN Low OFF Low Low OFF

COMPRESSOR ON OFF ON OFF

A point; While the indoor Heat-Exchanger temperature is higher than 35°C fan operates at low speed, when

it becomes lower than 35˚C fan stops.

B point; When the indoor Heat-Exchanger temperature is higher than 35°C, fan operates at seleted fan

speed, when it becomes lower than 35°C, the fan operates at low speed for 10sec, after 10sec, it

operates at seleted fan speed.

4. Heating Mode Operation (Except Cooling Model)

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

Hot Start

Low

Selecting

Fan Speed

minimum 3min

Selecting fan

speed

minimum

10sec.

1min

minimum

1min.

minimum

10sec.

5. Hot-Start Control

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

The operation diagram is as following.

PIPING

TEMPERATURE 1min

COMPRESSOR

INDOOR FAN

26°C

: Selected Fan : Low Fan : Fan Stop

28°C

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