LG LBNG3061YL, LBUG3061YL Service Manual

Ceiling Duct Air Conditioner

SVC MANUAL(Exploded View)

MODEL : LBNG3061YL
LBUG3061YL

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 :

Contents

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

Product Specifications (Cooling & Heating)..........................................................................6

Dimensions ..............................................................................................................................7

Refrigeration Cycle Diagram ..................................................................................................8

Wiring Diagram ........................................................................................................................9

Operation Details ...................................................................................................................10

Installation of Indoor, Outdoor Unit .....................................................................................14

Test Running...........................................................................................................................23

Optional Operation ................................................................................................................25

Cycle........................................................................................................................................27

Cycle Troubleshooting Guide ..............................................................................................30

Electronic Parts Troubleshooting Guide .............................................................................31

Electronic Control Device .....................................................................................................44

Exploded View ........................................................................................................................48

- 2 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

Functions

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

Auto Operation(Auto Change Over)

Deice (defrost) control (Heating)

Auto Restart

- 3 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

Hot-start Control (Heating)

High head height Drain pump(Optional)

Central Control(Optional)

Group Control(Optional Wiring)

PLASMA (Optional)

Telephone Control Operation (Optional)

Radio Frequency Control Operation(Optional)

•

Maintains the room temperature in accordance with the Setting Temp.

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

• High, Med, Low

• 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 rule.

• Both the indoor and outdoor fan stops during defrosting.

• Hot start after defrost ends.

- 4 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

Outdoor Unit

Power relay control

Comp. Freq. control

Overheatng. Protection(Power module)

Freq. speed control(up/down speed)

V/F control

Total current control (over current protection)

DC peak current control

4 way valve control

Outdoor fan motor control

Discharge pipe temp. control

Overpressure protection

• If power is on, it will operate to chage capacitor on controller and power relay will operate after about
10sec.

• The final operating freq. of comp. is set the lowest freq. that limited outdoor temp., discharge pipe temp.,

target freq., owing to CT.

• It will be changed the drive voltage of comp. according to operating frequency.

• It is only operated in the heating operation mode except defrosting operation.

• High speed/Low speed

- 5 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
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 Timer

Weekly Program

(Cooling

model only)

(Heating

model only)

(Low) (Med) (High)

Cooling Operation Mode ( )
Heating Operation Mode ( ) Auto Operation Mode ( ) : Cooling model

Soft Dry Operation Mode ( )

Fan Operation Mode

Phase Control Setting

HI AUTOMEDLO

Auto change-over ( ) : Heating model

Program Holiday

SET/CLR

MinHour

Week

Timer CancelTimer Cancel

Timer

: 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

- 6 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

Power Source Ø, V, Hz"

Cooling Capacity kcal/h(BTU/h)

W

Input W

Heating Capacity kcal/h(BTU/h)

W

Input W

Rated Load Amp. Cooling A

Heating A

Air Volumn Cooling(H/M/L)

CMM(m

3

/min)

Heating(H/M/L)

Refrigerant(R-22) g

Drain Hose In. Dia mm

Main Cable

No. X mm

2

Connecting Cable

Remote Control Type

Refigerant Control Type

Fuction Soft Dry

Timer

Self Diagnosis

Deice Operation

Hot Start

Zone Control(Optional)

Central Control(Optional)

Group Control(Optional wiring)

Weekly Programning

2-Thermistor

Drain Pump (Optional)

Auto changeover(Auto Operation: CL)

Stand-by Consumption 0

Radio frequency control(Optional)

Tele Control(Optional)

PLASMA(Optional)

Connecting Pipe Liquid Inch

Gas (mm)

Dimension Indoor mm

Outdoor (WxDxH)

Net Indoor Kg
Weight

Outdoor

1, 220-240, 50

7,600(30,000)

8,792

3,550

8,064(32,000)

9,378

2,900

17.5

14.0

26/22/18

26/22/18

1,600

22.6

3*5.5

4*0.75

L.C.D Wired

LEV

Yes

24 Hours On/Off

Yes

Yes

Yes

Optional

Optional

Yes

Yes

Yes

Optional

Yes

Yes

Optional

Optional

Optional

1/4(6.35)

5/8(15.88)

1180*450*298

870*320*800

35

72

Model

LB-G3061YL

Product Specifications (Cooling & Heating)

- 7 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

Dimensions

W

H

D

(1) Indoor Unit

MODEL

DIM

W(mm) 1180

H(mm) 298

D(mm) 450

LBNG3061YL

H

W

D

MODEL

DIM

W(mm) 870

H(mm) 800

D(mm) 320

LBUG3061YL

(2) Outdoor Unit

Refrigeration Cycle Diagram

•

LB-G3061YL

• Rated performance for refrigerant line length of: 7.5m

• If it is installed at a distance of 15m, 300g of refrigerant should be added (15-7.5) x 40g = 300g

- 8 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

INDOOR UNIT OUTDOOR UNIT

HEAT
EXCHANGER

HEAT
EXCHANGER

LEV

COMPRESSOR

GAS PIPE
SENSOR

HEATING
SENSOR

DISCHARGE
PIPE SENSOR

GAS SIDE

LIQUID SIDE

COOLING

HEATING

REVERSING
VALVE

LIQUID PIPE
SENSOR

INDOOR
TEMPERATURE
SENSOR

LB-G3061YL 5/8" 1/4" 7.5 15 7.5 12.5 40

*Additional

refrigerant

(g/m)

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

MODEL

Gas Liquid Rated Max. Rated Max.

- 9 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

Wiring Diagram

Model : LBNG3061YL

Model : LBUG3061YL

INDOOR WIRING DIAGRAM

INDOOR

MOTOR

DRAIN
PUMP

YL

BR

BR

BL

RD

GN/YLGN/YL

ORRDBL

BL

BL

BK

GN/YL

COMP

FUSE

250V10A

ROOM.

THERMISTOR

PIPE

THERMISTOR

RF REMOTE

CONTROL

FLOAT S/W

REMOTE

CONTROL

ZONE

CONTROL

OPTIONAL
EXTRA

TERMINAL

BLOCK

TO OUTDOOR UNIT

3854A20172U

1(L) 2(N) 3 4 5

TELE

CONTROL

Comp.

U

UN

P

IPM

W

W

4WAY

V

V

RD

YL

RD

RD

RD

RD

RD

BR

CT

BR

BR

BL

RD

BK

BK

BK

BK BK

BK

BK

H/P SWITCH

BRIDGE
DIODE

BRIDGE
DIODE

CAPACITOR
(400V,165μF)

400V,2500μF(DC LINK)

CAPACITOR

POWER
RELAY

3561(L) 2(N)

1(L) 2(N)

BR

BR

BR

BL

10

24

GN/YL

GN/YL

BL

BL

BL

WH

WH

BL

WH

WH

WH

(WH)

(RD)

(WH)

(RD)

GND

YL

BR

BK

BK

NL

BK

WH

BK

BL

CN­GATE1

CN­GATE2

CN­IPM

CN­IPM

CN­GATE1

LEV

CN-DATA

CN-POWER CN-PWR

RY-START

250V, 3.15A

FUSE

RY-

PWR

CN-AC

REACTOR

POWER-OUT

FUSE

250V,25A

POWER-IN

(8PIN)

CN-LEV4CN-TH6

CN-TH3

CN-TH2

CN-TH1

COND
SENSOR

AIR
SENSOR

PIPE
SENSOR

SUCTION
SENSOR

DISCHARGE

SENSOR

(7PIN) (9PIN)

CN­GATE2

MAIN
PCB

CN-FAN

RY-LOW

RY-HIGH

CN-DC

CN-4WAY

WH

WH

WH

TO INDOOR UNIT

MAIN POWER

1Ø, 220~240V, 50Hz

3854A20179X

NOISE

FILTER

MOTOR

CAPACITOR

BL

BR YL

YL BR BL BK OR

BK

OR

- 10 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
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 selected the Cooling( ) Mode Operation, the unit will operate according to the setting by the remote con-

troller and the operation diagram is as follows.

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

Selected Selected Selected

fan speed fan speed fan speed

COMPRESSOR ON OFF ON OFF ON

INDOOR FAN Low Low

- 11 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
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 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 seleted fan
speed, when it becomes lower than 39°C, the fan operates at low 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 follows.

Hot Start

Low

Selected

Fan Speed

minimum 3min

Selected fan

speed

minimum

10sec.

1min

AA

minimum

10sec.

B

5. Hot-Start Control

• The indoor fan stops until the evaporator piping temperature will be reached to 31°C.

• The operation diagram is as following.

PIPING
TEMPERATURE

1min

COMPRESSOR

INDOOR FAN

ON

28°C

: Selected Fan : Low Fan : Fan Stop

31°C

- 12 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

6. Defrost Control

• Defrost control is availavle 45 minutes later since heating mode operation started, and it will not prolong over
10 minutes.

• Defrost control is carried out when the outdoor pipe temp. falls below -6°C for more than 3 minutes after 45
minutes passed from starting of heating operation.

• Defrost ends after 10 minutes passed from starting of defrost operation or when the outdoor pipe temp. rises
over 12°C after 5 minutes passed from starting of defrost.

7. Self-diagnosis Function

• 'CHECK' will display in the remote controller display when a problem occurs. Then please contact your dealer.

• Correct the accident point as shown in the table below before restarting operation.

• During the normal operation 'CHECK' won't be displayed in the remote controller.

Remote controller LCD Accident Point

CH 01 Indoor room or piping temperature thermistor error

CH 02 Outdoor air or piping temperature thermistor error

CH 03

Indoor main body / Remote controller unit communication error

CH 04(Optional) Water level float switch error

CH 05

Indoor and outdoor communication line error

CH 08

CT error

CH 09

DC peak error

CH 10

DC Low voltage error

CH 11

High pressure switch or instantaneous power failure

CH 14

Discharge pipe temperature overheating

More than 45 minutes

of heating operation

Within

9min. 45sec.

ON OFF

ON ON

ON

ON OFF

OFF

COMPRESSOR

4-WAY VALVE

INDOOR FAN

-6°C ON

12°C OFF

The outdoor

piping Temp.

ON

More than 10 min.

running of compressor

More than 45 minutes

of heating operation

5sec.

HOT-

START

ON

- 13 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

Installation of Indoor, Outdoor Unit

1. Selection of the best location

1) Indoor unit

Select location

Install the air conditioner in the location that satis­fies the following conditions.

• The place shall easily bear a load exceeding four
times the indoor unitʼs weight.

• The place shall be able to inspect the unit as the
figure.

• The place where the unit shall be leveled.

• The place shall allow easy water drainage.(Suit­able dimension “H” is necessary to get a slope to
drain as figure.)

• The place shall easily connect with the outdoor
unit.

• The place where the unit is not affected by an
electrical noise.

• The place where air circulation in the room will be
good .

• There should not be any heat source or steam
near the unit

2) Outdoor unit

• If an awning is built over the unit to prevent direct
sunlight or rain exposure, be careful that heat
radiation from the condenser is not restricted.

• There should not be any animals or plants which
could be affected by hot air discharged.

• Ensure the spaces indicated by arrows from the
wall, ceiling, fence or other obstacles.

3) Piping length and the elevation

Indoor unit

Outdoor unit

B

A

H

600600

Top view�

(unit: mm)

Front view

Front

Inspection hole

(600X600)

Control box

1000

More than
30cm

More than
30cm

More than
70cm

Sunroof

Fence or�

obstacles

• If it is installed at a distance of 15m, 300g of refrigerant
should be added (15-7.5) x 40g = 300g

• Capacity is based on standard length and maximun
allowance length is on the basis of reliability.

• Improper refrigerant charge may result in abnormal
cycle.

Capacity

Gas Liquid

Elevation B(m)

Length A(m)

*Additional
refrigerant

(g/m)

Pipe Size

(Diameter: Ø)

Standard StandardMax. Max.

4030K BTU/h 5/8" 1/4" 7.5 7.515 12.5

- 14 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

2. Indoor unit installation

n Installation of Unit

Install the unit above the ceiling correctly.

• Apply a joint-canvas between the unit and duct to
absorb unnecessary vibration.

• Apply a filter Accessory at air return hole.

• Install the unit leaning to a drainage hole side as a
figure for easy water drainage.

• A place where the unit will be leveled and that can
support the weight of the unit.

• A place where the unit can withstand its vibration.

• A place where service can be easily performed.

CASE 1

POSITION OF SUSPENSION BOLT

CASE 2

POSITION OF CONSOLE BOLT

(Unit:mm)

Drainage hole

M10 Nut

M10 SP. washer

M10 washer

X 4

X 4

(Local
supply)

X 4

M10 Nut

M10 SP. washer

M10 washer

X 4

X 4

(Local
supply)

X 4

A

B

C

1-3 mm

D

(G)

H

I

EF

NOTE:

• Thoroughly study the following installation locations:

1. In such places as restaurants and kitchens, considerable amount of oil steam and flour adhere to the fan, the fin of the heat
exchanger, resulting in heat exchange reduction, spraying, dispersing of water drops, etc.
In these cases, take the following actions:

• Make sure that the ventilation fan for smoke-collecting hood on a cooking table has sufficient capacity so that it draws oily

steam which should not flow into the suction of the air conditioner.

• Make enough distance from a cooking room to install the air conditioner in such a place where it may not suck in oil steam.

2. Avoid installing air conditioner in such circumstances where cutting oil mist or iron powder is in suspension in factories, etc.

3. Avoid places where inflammable gas is generated, flows in, is stored or vented.

4. Avoid places where sulfurous acid gas or corrosive gas is generated.

5. Avoid places near high frequency generators.

ABCDEF(G)HI

1232 1182 355 45.5 450 30 87 830 186

Dimension

Capacity

30K BTU/h

- 15 -

Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

3. The Indoor Unit Installation

• Select and mark the position for fixing bolts.

• Drill the hole for set anchor on the face of ceiling.

• Insert the set anchor and washer onto the suspen­sion bolts for locking the suspension bolts on the ceil­ing.

• Mount the suspension bolts to the set anchor firmly.

• Secure the installation plates onto the suspension
bolts (adjust level roughly) using nuts, washers and
spring washers.

4. Remote Controller Installation

• Although the room temperature sensor is in the indoor unit, the remote controller should be installed
in such places away from direct sunlight and high humidity.

Installation of the remote controller

• Select places that are not splashed with water.

• Select control position after receiving customer approval.

• The room temperature sensor is built in the indoor unit.

• This remote controller equipped with liquid crystal display. If this position is higher or lower, display is difficult
to see.(The standard height is 1.2 ~ 1.5m high)

Routing of the remote controller cord

• Keep the remote controller cord away from the refrigerant piping and the drain piping.

• To protect the remote controller cord from electrical noise, place the cord at least 5cm away from other power
cables (audio equipment, television set, etc.)

• If the remote controller cord is secured to the wall, provide a trap at the top of the cord to prevent water

droplets from running.

Tighten the nut and bolt to prevent unit falling.

CAUTION

1 Set anchor

Old building New building

2 Plate washer
3 Spring washer

4 Nut

5 Suspension
bolts

• Local supply

¿ Set anchor
¡ Plate washer - M10
¬ Spring washer - M10
√ Nut - W3/8 or M10
ƒ Suspension bolt - W3/8 or M10