LG LRTBC2025W, LRTBC2025BS, LRTBC2025BK Owner’s Manual

SERVICING PRECAUTIONS

AIR RECHARGING IN COMPRESSOR

Test the refrigeration system connecting it electrically before
refilling operation. It is necessary to ascertain the function
of the moter-comprassor and identify the defects

immediately. If defects have been found, empty the old
system of possible R-134a residue by breaking off the end
of the extension piece at its narrow point. (Figure 1)

Replace the filter and any damaged components. Uneelder

and pull off the piece remaining inside the service tube and

then attach an complete extension with male Hansen and

at last, solder itto the same tube again. (Figure 2)

POINT TO BE BROKEN

SERVICE TUBE EXTENSION

Figure f

It is necessary to execute the soldering operation with

valve open so that the fumes caused by oil residue can
come out freely without blowholes between two tubes
during the heating the of the point to be soldered.
The extension fitted with the male Hansen is connected to

the female fitting of the vacuum pump tube. (Figure 3)

CHARGE TUBE FEMALE
EXTENSION HANSEN

"_ MALE HANSEN

SOLDERING POINT

Figure 2

vacuum operation is over, add the quantity in grams of
R-134a to the refrigeration system. Remember that every
system has an exact quantity of R-134a with a tolerance of

-+5grams that can be added. (Figure 4)

TO THE R-t34a CYLINDER

L

_ _ TOTHE REFRIGERATION

Before performing this operation (if the vacuum pump and
refilling cylinder are connected), make sure that the valve

placed between the vacuum pump and the refilling tube are
closed in order to keep the Freon for addition to the system.

(Figure 5)

FILLING OR VALVE TO BE OPENED

CHARGE TUBE WHEN REFILLING

SYtTEM Figure 4

__RESS!E

GAUGE

Air evacuating from the system begins as soon as the

pump starts. The refrigeration system must be kept under
vacuum until the reading on the low-pressure gauge

indicates vacuum (0 absolute, -1 atm., -760 mm hg) inany
case it is advisable to keep the pump running for about 30

minutes. (Figure 3)
In case that a considerable leakage occurs it will be

necessary to stop the vacuum pump and to add asmall

quantity of Freon to the system, if vacuum should not be
obtained (pressure gauge can't fall to 1 atmosphere), start

the refrigeration unit and find the leakage with the special

leak-finder, When the defective soldering point is visible,
re-do it after opening the extension tube valve and
reestablishing the normal outside pressure inside the

group.
Because the melted alloy is sucked into the tubes and

block them, the pressure must be rebalanced when
vacuum is in the system in soldering. As soon as the

TO THE REFRIGERATION TO THE CHARGE

SYSTEM CYLINDER

VALVE TO BE CLOSED
AFTER VACUUM

TOTHE
VACUUM _ Figure 5

PUMP

In addition, check the graduated scale on the cylinder for

the quantity of Ro134a to be added, for example, if we
have 750 grams of Fraon in the cylinder and must add 140
grams to the group, this amount will be reached when
R-134a has dropped to 610 grams, remembedng that the

indicator shows a lower limit of meniscus. Do this after
choosing the scale corresponding to the gas pressure

different scales reported as the same gas pressure
indicated by the pressure gauge on the top of the column.

To make R-134a flow into the system, open the valve
placed at the base of the cylinder and connected to the

fillingtube. The amount of Freon cannot be added to the
system all at once because it may cause a blocking of motor°

compressor. Therefore, proceed by adding the original
quantity of about 20-30 grams and close the valve
immediately.

The pressure rises and the motor compressor must start

sucking the gas and lowering the pressure again. Regulate

the valve again, maintaining the same manner until

reaching to the quantity of R-134a established for the
system being charged. When the system is running, the
suction pressure must be stabilized b_ween 0.30 to

0.6(0.10 to 0.4) atmosphere.

I

1. SPECIFICATIONS

1-1. Ref. No.: GR-T622DE

ITEMS

DOOR DESIGN

DIMENSIONS (ram)

NET WEIGHT (kg)
COOLING SYSTEM

TEMPERATURE CONTROL

DEFROSTING SYSTEM

DOOR FINISH

HANDLE TYPE

INNER CASE
INSULATION

1-2. Ref. No.: GR-T722DE

SPECIFICATIONS

Side Rounded

750×723×1732(WxDxH)

9O

Fan Cooling

KnobDial

FullAutomatic

Heater Defrost

Witha "i3mer

EmbossedMetal

Bar

ABS Resin

Polyurethane Foam

ITEMS

VEGETABLE TRAY

COMPRESSOR

EVAPORATOR

CONDENSER

REFRIGERANT

LUBRICATING OIL

DEFROSTING DEVICE

LAMP

* Freezer lamp is optional part,

FREEZER

REFRIGERATOR

SPECIFICATIONS

TransparentDrawer Type

PTC Starting Type

Fin Tube Type

Wire Condenser

R-134a (140 g)

Freol@ 15G (320 cc)

SHEATH HEATER

15W*
4OW

ITEMS

DOOR DESIGN

DIMENSIONS (ram)
NET WEIGHT (kg)

COOLING SYSTEM

TEMPERATURE CONTROL

DEFROSTING SYSTEM

DOOR FINISH

INNER CASE

INSULATION

SPECIFICATIONS

Side Round

750x776x1732(WxDxH)

93

Fan COoling
Knob Dial

Full Automatic
Heater Defrost

With a Timer
Pre Coated Metal

ABS Resin

Polyurethane Foam

ITEMS
VEGETABLE TRAY
COMPRESSOR

EVAPORATOR

CONDENSER

REFRIGERANT

LUBRICATING OIL

DEFROSTING DEVICE

LAMP

* Freezer lamp is optional part.

FREEZER

REFRIGERATOR

SPECIFICATIONS

Transparent Drawer Type

PTC Starting Type

FinTube Type

Wire Condenser

R-134a (140 g)

Freol@ 1,5G(320 co)
SHEATH HEATER

15 W*

40 W

2. PARTS IDENTIFICATION

FREEZER

COMPARTMENT

Freezer Shelf

Automatic Ice Maker

Freezer Temperature

and Ice Bank

(Optional)

General Type

Ice Tray (Optional)

Control Dial

Temperature

Control Dial

Lamp

Shelves

Snack Corner

Crisper

Used to keep fruits

and vegetables

fresh and crisp.

Lamp (Optional)

Freezer Door Bin

Door Cooling
On the refrigeratordoor,

the cold air passageway is
installedto supply

coldair to the doorsideof

the refrigerator
compartment.

Can Server

Dairy Corner

Wine Rack (Optional)

Adjustable

Door Bin

Rack

Screw

(Inside)

Base Grllle

3. DISASSEMBLY

3-1 DOOR

• Freezer Door

1. Remove the hinge cover by pulling it upwards.

2. Loosen hexagonal boils fixing the upper hinge to the
body and lift the freezer door.

{_ HINGE COVER

HINGE

BOLT

Figure 6

3. Pull out the door gasket to remove from the door foam

Ass'y.

GASKET

3-2 DOOR SWITCH

1. To remove the door switch, pull out it with a '-' type

driver as shown in (figure 9).

2. Disconnect the lead wire from the switch.

LEAD Wl RE

Figure 9

3-3 THERMOSTAT

1. Remove Control Box-R by loosening 2 screw fixed to

ceiling of Refdg_ator compadrnent (Figure 10)

2. Separate the thermostat and dial knob F_

3. Remove the thermostat by disconnecting the lead wire.

Figure 7

• Refrigerator Door

1. Loosen hexagonal botts fixing the lower hinge to the

body to remove the refrigerator door only.

LOWERHINGE

BOLT

Figure 8

2. Pulloutthe door gasket to removefrom the door foam

Ass'y.

Figure 10

3.4 FAN AND FAN MOTOR

1. Remove the freezer shelf. (If your refrigerator have an
Ice Maker, disassemble the ice maker first)

2. Remove the Gritle by pulling it out and by loosening a

screw.

3. Remove the Fan Motor Assy by loosening 4 screws and
disassemble the shroud.

4. Pull out the fan and, separate the Fan Motor, Bracket.

SHROUD

FAN

3_6 LAMP

FREEZER ROOM LAMP

Figure 15

3-6-1 Freezer room lamp

1. Unplug the power cord from the outlet,

2. Remove the room lamp lid by taking down while pulling

it forward with your hand after inserting finger into the
inside bole as shown in (figure 15).

3. Remove the lamp by taming it counterclockwise.
4, Assemble in reverse order of disassembly. Replacement

bulb must be the same specication a_ original.

-GRILLE Figure 12

3-5 DEF" CONTROL ASSY
Def controlAssy consistsof DefrostThermostatand FUSE-M.

Defrost Thermostat functions to defrost automatically and it
is attached to metal side of the Evaporator and senses

Temp.
Fuse-M is a kind of safety device for preventing over-

beating of the Heater when defrosting.
At the temperature of 77°C, it stops the emission of heat

from the Heater.

1. Pull out the Gdlle Ase'y.

2. Separate the connector connected with the Def Control
Assy and replace the Def Control Assy after cutting the
Tie Wrap. (Figure 14)

SHROUD-F

DEF-THERMO

FUSE-M

Figure 13

HOLDERFUSE

Figure 14

REFRIGERATOR ROOM LAMP

Figure 16

3-6-2 Refrigerator room lamp

1. Unplug the power cord from the outlet,

2. Remove refrigerator shelves.

3. Upper Refrigerator Lamp.

Release the hooks on both ends of the lamp shield and
pull the shield downward to remove it.

4. Turn the lamp counterclockwise.

5. Assemble in reverse order of disassembly, Replacement
bulb must be the same specification as original.
(Max 40 W)

3-7 CONTROL BOX-R

1. First, remove all shelves in the refrigerator and Control
Box-R by loosening 2 screw.

CONTROL BOX-

COVER LAMP_)@ Figure 17

2. Remove the Control Box-R by pulling it downward,

3. Disconnect the L/wire on the right position and seperate
timer, themostet, Lamp socket, etc.

4. ADJUSTMENT

_ICOMPRESSOR

4-1-I Role
The compressor intakes low temperature and low pressure

gas evaporated from Evaporator of the Refrigerator, and
condenses this gas to high temperature and high pressure
gas, and then plays delivehng role to Condenser.

4-1-2 Composition
The Compressor is Composed of Compressor Apparatus
compressing gas, Compressor Motor moving Compressor

Apparatus and Case protecting Compressor Apparatus
and Motor. There are PTC-Starter, and Over Load

protector (OLP) in the Compressor outside. On the other
hand, because the Compressor consistsof 1/100gram pmcassing

precisioncomponentsand issealedafter production in absence
of dust or humidity, deal and repair with care.

4-1-3 Note for Usage
(1) Be careful not to allow over-voflage and over-current.
(2) No Strike

If applying forcible power or strike (dropping or careless

deaitng), poor operation and noise may occur.

(3) Use proper eiecbic components appropriate to the

Compressor.

(4) Note to Keep Compressor.

If Compressor gets wet in the rain and rust in the pin of
Hermetic Terminal, the result may be poor operation

and poor contact may cause.

(5) Be careful that dust, humidity, and flux welding don't

inflow in the Compressor inside in replacing the
Compressor. Dust, humidity, and flux due to welding

which inflows to Cylinder may cause Iockage and noise.

4-2 PTC-STARTER

4-2-1 Composition of PTC-Starter

(1) PTC (Positive Temperature Coefficient) is a no-contact

semiconductor starting device which uses ceramic
material and this matedal consists of BaTiO3.

(2) The higher the temperature is, the higher becomes the

resistance value. These features are used as starting
device for the Motor.

4.2-2 Role of PTC-Starter
(1) PTC is attached to Hermetic Compressor used for

Refrigerator, Show Case and starts Motor.

(2) Compressor for household refrigerator applies to

single-phase induction Motor.
For normal operation of the single-phase induction

motor, in the starting operation flows in both main coil
and sub-coil. After the starting isover, the current in
subceit is cut off. The proper features of PTC play all

the above roles. So, PTC is used as a motor starting
device.

4,.2-3 PTC-Applied Circuit Diagram

• According to Starting Method for the Motor

OVERLOAD PROTECTOR(O.L.P)

_ [--_-C7 = _'_ COMPRESSOR

' '"* MOTOR

PTC STARTER HERMETIC

RSIR

4-2-4 Motor Restarting and PTC Cooling

(1) For restarting after power off d udng normal

Compressor Motor operation, plug the power cord after
5 rain. for pressure balance of Refngerating Cycle and
PTC cooling.

(2) During normal operation of the Compressor Motor, PTC

elements generate heat continuously. Therefore,

if PTC isn't cooled for a while after the power has been

shut off, Motor can't operate again.
4-2-5 Relation of PTC-Starter and OLP
(1) If the power is offduring operation of Compressor and

the power is on before the PTC is cooled, (instant shut-
off within 2 rata, or reconnect a power plug due to

misconneotthg), the PTC isn't cooled and a resistance
value grows. As a result, current can't flow to the sub-

coil and the Motor can't operate and the OLP operates
by flowing over current in only in the main-coil,

(2) While the OLP repeats on and off operation about 3-5

times, PTC is cooled and Compressor Motor performs

normal operation.
If OLP doesn't operate when PTC is not cooled,

Compressor Motor is worn away and causes circuit-

short and fire. Therefore, use a properly fixed OLP

without fail.

4-2-6 Note to Use PTC.Starter
(1) Be careful not to allow over-voltage and over-current.

(2) No Strike

Don't apply a forcible power or strike.

(3) Keep apart from any liquid.

If liquid such as oil or water away enter the PTC,
PTC matedals it may break due to insulation

breakdown of the material itself.

(4) Don't change PTC at your convenience.

Don't disassemble PTC and mold. If the exterior to the
PTC-starter is damaged, resistance value is altered and

it may cause poor starting of the compressor motor
may cause,

(5) Use a prepedy flied PTC.

TERMINAL

Figure 19

4-30LP(OVERLOAD PROTECTOR)

4-3-1 Definition of OLP

(1) OLP (OVERLOAD PROTECTOR) is attached to the

Compressor and protects the Motor by cutting the
current to the Motor ifthe temperature rises and

activates the bimetal spring in the OLP.

(2) When over-voltage flows to Compressor motor, the

Bimetal works by heating the heater inside the OLP,
and the OLP protects Motor by cutting off current which
flows to the Compressor Motor.

4-3-2 Role of the OLP

(1) The OLP is attached to the Hermetic Compressor used

for the Refrigerator and Show Case and prevents the

Motor Coil from being started in the Compressor.

(2) Do not turn the Adjust Screw of the OLP in any way for

normal operation of the OLP.
(Composition and connection Diagram of OLP)

5. CIRCUIT DIAGRAM

CIRCUIT DIAGRAM ]

CONTACTING
POINT

SCREW

ADJUST

COVER

BIMETAL

CONTACTING

POINT

HEATER

BIMETAL

HEATER

WATERSUPPLYING
TIMECONTROLOPTION

Figure 21

=-,

W CAPACITORS, T_E PLUG TYPE, EARTH p_,R ]t _ND ICE MAKE R OPTION pART ON CIRCU _T DIAG

ARE StJBJE_T TO C_,ANGE IN DIFFeReNT LOC,t_.ITIES

WH: WHITE BL : BLUE RD : RED PK : PINK

BK : BLACK BN : BROWN PR : PURPLE YL : YELLOW

BO : BRIGHT ORANGE GY : GRAY GN :GREEN

NOTE : 1. This is a basic diagram and specifications vary in different localities.

b"CAUTION : Pleaseunplugthe

power cordfromthe wailoutlet.

SWITCH NO

SW1 SW2 SW3
OFF OFF OFF 10,5sec

ON OFF OFF 9sec

OFF ON OFF 10 sec

ON ON OFF 11 sec

OFF OFF ON 12sec

ON OFF ON 13sec

OFF ON ON 14sec

ON ON ON 15sec

swITCH ' "_ ON

SWITCH _ 2 3
OFF _

SWt SW2SW'3

TIME

3854JD1033,

6. TROUBLESHOOTING

6-1 COMPRESSOR AND ELECTRIC COMPONENTS

Remove the PTC-

[_ Power Source.

Starter from the
Compressor and

measure the voltage
between Terminal C of

Compressor and
Terminals 5 or 6 of PTC.

_ (Rating Voltage

±10%)? I YES _,[_

No Voltage. _ OLP disconnected?

_,,_ Check connection

| condition, _-_

-_. in the range of Rating
Applied voltage isnl

Voltage ±10%.

Check the
resistance of

Motor
Compressor.

[_ Check the YES

[_ Check OLP. _-_ Check if applying _ OLP works within il YES _I I a regular OLP. L 130 sec. in forcible OLPI t

resistance of [ Replace
PTC-Starter. NO ]D/ PTC-Starter.

among M-C, S-C and

M-S in Motor

_ heck the resistance N_O

Compressor.

of two terminals in

ChocktheresistanceI

PTC-Starter.

I I I_ Ioperationbytuming _ ReplaceOLP.

_._ dvise the customer

to use a regular
TRANS.

YES v_"=_

Replace Compressor.

YES

Replace OLP.

ReconnectI

I

NO

starting state. I r I starting voltage after 5 I I the voltage of Rating " '

I I rain. for balancing cycle I I Voltage ±10%

| pressure and cooling the I I below. ]l, _'_

/ PTc" I I / "°

LY

6-2 PTC AND OLP

Normal operation of I--

Compressor is
impossible or poor.

6-3 DEFROST TIMER

Separate the PTC-
Starter from

/

Compressor and
measure the

resistance between

No. 5 and 6 of PTC-

Starter with a Tester or
Whistone Bddge.

(Figure 21)

Separate the OLP from [YESJ

">' Compressor and check

the resistance value I I
between two terminals I

of OLP with a Tester,
(Figure 22)

F_Figure21

Observation value is I _1
220V/50Hz : 225 ±30%

115V/60Hz : 6.8§ ±30%
240V!50Hz : 33_ ±30%
127, 220V/6OHz : 225
±30%

The resistance value J _1

is 0 or several
hundreds § .

The value is i "i

elec_c components.

Check another j

Replace OLP.

I

22

Check another ielectdccomponents.

Replace PTC-

Starter

I

Normal operation of

the Defrost Timer is

impossible.

I No defrosting.

I Poor cooling.

Position the Cam Shaft to
the point of first *click'

sound and check the
current flowing between

terminals No. 1(brown)
and No. 2(bright orange).

Next, position the Cam
Shaft to the point of
second "click" sound and

check the current flowing
between terminals

No. 1(brown) and
NO. 4(black)
(Figure 23).

Turn the Cam Shaft.

with holding the Cam

I Sheke about 3 times

Shaft and Body softly.

p

-_The resistance is _- t_

0_ or variable.

._The resistance is _{

220V/5OHz :20Ks

_]_ The resistanceis about _f

t15V/6OHz : 7.8K5 .

I ,!

I_ Loud 'click' sound. I_

r_ Figure 23

Defrost Timer.

Replace the I

Defrost Timer.

Replace the I

Checkthe another i

electric components. I

Defrost Timer.

Replace the I

Defrost Timer,

Replace the I

ii