LG LRTBC2025T User Manual REFRIGERATOR Manuals And Guides L0301141

LG Top Mount Refrigerator Manual L0301141 LG Top Mount Refrigerator Owner's Manual, LG Top Mount Refrigerator installation guides

User Manual: LG LRTBC2025T LRTBC2025T LG REFRIGERATOR - Manuals and Guides View the owners manual for your LG REFRIGERATOR #LRTBC2025T. Home:Kitchen Appliance Parts:LG Parts:LG REFRIGERATOR Manual

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SERVICING PRECAUTIONS
AIR RECHARGING

IN COMPRESSOR

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 that can be added
with a tolerance of +5 grams. (Figure 4)

Test the refrigeration system connecting it electrically before
refilling operation. It is necessary to ascertain the function
of the motor-compressor
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. Unsolder
and pull off the piece remaining inside the service tube and
then attach an complete extension with male Hansen and
at last, solder it to the same tube again. (Figure 2)
POINT TO BE BROKEN

CHARGE TUBE
EXTENSION

SERVICE

TO THE R-134a CYLINDER

FEMALE
HANSEN

MALE HANSEN

TUBE EXTENSION
Figure

SOLDERING
Figure

_,,

TO THE REFRIGERATION
SYITEM
Figure 4

POINT

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 is
closed in order to keep the Freon for addition to the system.
(Figure 5)
FILLING OR
VALVE TO BE OPENED
CHARGE TUBE
WHEN REFILLING

It is necessary to execute the soldering operation with
valve open so that the fumes caused by oil residue can
come out freely without blowhetes 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)

TO THE REFRIGERATION
SYSTEM

TO THE CHARGE
CYLINDER

VALVE TO BE CLOSED
AFTER VACUUM
TO THE
VACUUM
PUMP

GAUGE
Figure

Figure

In add:tion, check the graduated scale on the cylinder for
the quantity of R-134a to be added, for example, if we have
750 grams of Freon in the cylinder and must add 140
grams to the group, this amount will be reached when
R-134a has dropped to 610 grams, remembering 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 connected to the filling
tube. The amount of Freon cannot be added to the system
all at once because it may cause a blocking of motorcompressor. Therefore, proceed by adding the original
quantity of about 20-30 grams and close the vane
immediately.

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). In any
case it is advisable to keep the pump running for about 30
minutes. (Figure 3)
If considerable leakage occurs, it will be necessary to stop
the vacuum pump and to add a small quantity of Freon to
the system. If vacuum should not be obtained (pressure
gauge can't fall to f atmosphere), start the refrigeration
unit and find the leakage with special leak-finder. When the
defective soldering point is visible, repair 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
blocks them, the pressure must be rebalanced when
vacuum is in the system when soldering. As soon as the

The pressure rises and the motor compressor must start
sucking the gas and lowering the pressure again. Open 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 between 0.30 to 0.6 (0.10 to 0.4)
atmosphere.
-3-

2. PARTS IDENTIFICATION

FREEZER
COMPARTMENT
Freezer Shelf
Lamp
Automatic Ice Maker
Freezer

tce Cube Box
Freezer Temperature
Control Dial

Door Bin

Door Cooling
On the refrigerator door,
the cold air passageway is
installedto supply
cold air to the doorside of
the refrigerator
compartment.

REFRIGERATOR
COMPARTMENT
Temperature
Control Dial

Egg Tray
Lamp

Can Server

Shelves

Dairy Corner
Can Storage

Egg Box

Adjustable
Door Bin

Snack Corner

Refrigerator Door
Rack

Crisper
Used to keep fruits
and vegetables
fresh and cdsp,

Leveling Screw
(Inside)

Base Grille
Push the grille toward
the refdgerator
until it snaps
into place.

-5-

3. DISASSEMBLY
3-1 DOOR

3-2 DOOR

• Freezer Door

1. To remove the door switch, pull out it with a slotted type
driver as shown in (figure 9).
2. Disconnect the lead wire from the switch.

1, Remove the hinge cover by pulling it upwards.
2. Loosen hexagonal bolts fixing the upper hinge to the
body and lift the freezer door.

SWITCH

LEAD WIRE
DOOR SWITCH

HINGE COVER

HINGE
BOLT

Figure
Figure

6
3-3 THERMOSTAT

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

1. Remove Control Bc_-R by loosening 2 screws attached to
ceiling of Reffigerator comparb_ent (Figure 10)
Separate the thermostat and dial knob F.
Remove the thermostat by disconnecting the lead wire.

GASKET

Figure

• Refrigerator

Door

1, Loosen hexagonal bolts attaching the lower hinge to the
body to remove the refrigerator door only.

Figure 10

LOWER HINGE

BOLT

Figure

2. Pun out the door gasket to remove from the door foam
assembly.

-6-

3-4 FAN AND FAN MOTOR

3-6 LAMP

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

have an
REFRIGERATOR ROOM LAMP

2. Remove the grille by pulling it out and by loosening a
screw,
3. Remove the Fan Motor assembly by loosening 4 screws
and disassemble the shroud.
4. Pull out the fan and separate the Fan Motor and Bracket.
Figure

16-1

SHROUD

3-6-1 Refrigerator

room

lamp

1. Unplug the power cord from the outlet.
2. Remove refrigerator shelves.
3. 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 odginaL
(Max 40 W)
FREEZER

Figure

ROOM LAMP

3-5 DEFROST CONTROL ASSEMBLY
Defrost control assembly consists of Defrost Thermostat
and FUSE-M.

Figure

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

3-6-2 Freezer

of 77°C, it stops the emission

room lamp

1. Unplug refrigerator or disconnect power.

Fuse-M is a safety device for preventing over-heating of the
Heater when defrosting.
At the temperature
from the Heater.

16-2

2, Reach behind light shield to remove bulb.
3. Replace bulb with a 25-watt appliance bulb,

of heat

4. Plug in refrigerator

or reconnect power,

1. Pull out the grille assembly.
2. Separate the connector connected with the Defrost
Control assembly and replace the Defrost Control

3-7 CONTROL

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

assembly after cutting the Tie Wrap. (Figure 14)
SHROUD-F

BOX-R

DEF-THERMO

CONTROL

BOX-

COVER

LAMP_

FUSE-M
Figure

HOLDERFUSE

Figure

2. Remove the Control Box-R by pulling it downward.
3. Disconnect the lead wire on the right position and
seperate timer, themostat, Lamp socket, etc.

-7-

4. ADJUSTMENT
_1 COMPRESSOR

4-2°3 PTC-Applied

4-1-1 Role

• According

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 delivering role to condenser.

Circuit Diagram

to Starting

Method for the Motor

OVERLOAD PROTECTOR(O.L.P)

4-1-2 Composition

F- -c-q

The compressor includes overload protection. The PTC
starter and OLP (overload protector) are outside the
compressor. Since the compressor is manufactured to
tolerances of I micron, and is sealed in a dust - and
moisture - free environment, use extreme caution when

F COMPRESSOR

.....

repairing it.

PTC STARTER

4-%3 Note for Usage

HERMETIC
TERMINAL

RSIR
Figure

(1) Be careful not to allow over-voltage and over-current.
(2) No Strike
If applying forcible power or strike (dropping or careless
handling), poor operation and noise may occur.

4*2*4 Motor Restarting

and PTC Cooling

(1) For restarting after power off during normal
Compressor Motor operation, plug the power cord after
5 rain. for pressure balance of Refrigerating Cycle and
PTC cooling.

(3) Use proper electric 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.

(2) During normal operation of the Compressor Motor, PTC
elements generate heat continuously. Therefore,
if PTC iso't cooled for a while after the power has been
shut oft, the motor will not restart.

(5) Be careful that dust, humidity, and welding flux don't
contaminate the compressor inside when replacing the
Compressor. Dust, humidity, and flux due to welding
which contaminates the cylinder may cause leskage
and noise.

4-2-5 Relation of PTC-Starter

and OLP

(1) If the power is off during operation of Compressor and
the power is on before the PTC is cooled, (instant shutoff within 2 rain. or unplugging and reconnecting), the
PTC isn't cooled and a resistance value grows. As a
result, current can't flow to the sub-ceil, the Motor can't
operate, and the OLP operates by flowing over current
in only in the main-cofi.

4-2 PTC-STARTER
4-2-1 Composition

of PTC-Starter

(2) While the OLP repeats on and off operation about 3-5
times, PTC is cooled and Compressor Motor performs
normal operation.

(1) PTC (Positive Temperature Coefficient) is a no-centact
semiconductor starting device which uses ceramic
material consisting of BaTiO3.

If OLP doesn't operate when PTC is not cooled,
Compressor Motor is worn away and causes cimuit*
short and fire. Therefore, always use a properly
attached OLR

(2) The higher the temperature is, the higher the resistance
value. These ,features are used as starting device for
the Motor,
4-2-2 Role of PTC-Starter

4-2-6 Note to Use PTC-Starter

(1) PTC is attached to Hermetic Compressor used for
Refrigerator, Show Case, and starting Motor,

(1) Be careful not to allow over-voltage and over-current.
(2) Do not strike

(2) Compressor for household refrigerator applies to
single-phase induction Motor.

Don't apply a forcible power or strike.

For normal operation of the single-phase induction
motor, in the starting operation flows in both main coil
and sub-coil. After the starting is over, the current in

(3) Keep apart from any liquid.
If liquid, such as oil or water away enters the PTC,
PTC materials may Fail due to insulation breakdown of
the materiel itself.

subcoil is cut off. The proper features of PTC play aft
the above roles. So, PTC is used as a motor starting
device.

(4) Don't change PTC at your convenience.
Don't disassemble PTC and case. 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 propedy attached PTC.

-8-

4-30LP

(OVERLOAD

4-3-1 Definition

PROTECTOR)

CONTACTING
POINT

of OLP

COVER

(1) OLP (OVERLOAD PROTECTOR) is attached to the
Compressor and protects the Motor by catting the
current to the Motor if the temperature rises and
activates the bimetal spring in the OLP.
(2) When over-voltage flows to Compressor motor, the
Bimetat works by heating the heater inside the OLR
and the OLP protects Motor by catting off currant which
flows to the Compressor Motor.

__BIMETAL

4-3-2 Role of the OLP
(1) The OLP is attached to the Hermetic Compressor used
for the Refrigerator and prevents the Motor Coil from
being started in the Compressor.

BIMETAL

(2) Do not turn the Adjust Screw of the OLP in any way for
normal operation of the OLR
(Composition

SCREW

and connection diagram of OLP)

ADJUST
Figure
HEATER

5. CIRCUIT DIAGRAM

10.5=
9se(
lOse
11se
t2se
13se
14s_
15se

SWn_H0FF

SWI SW2 SW3
3854JD1046C

-9-

6. TROUBLESHOOTING
6-1 COMPRESSOR AND ELECTRIC COMPONENTS

.._

Remove the PTCStarter from the

Power Source.

_}_ +-10%)?
(Rating Voltage

YES

}l_[_

Compressor and
measure the voltage
between Terminal C of
Compressor and
Terminals 5 or 6 of PTC,

-_No

Voltage.

OLP disconnected?
_

Replace OLR
condition.
Check connection t_ 1

L-_

Reconnect.

/ Applied voltage isn't
H

to use a regular
Advise the customer
transformer.

N_O

Replace Compressor.
YES

-}P,_ in the range of Rating
/ Voltage +-10%.

i_
[_

heck the of
resistance
Motor

heck the resistance
among M-C, S-C and
M-S in Motor

Compressor.

--_
[_

resistance
Check the of
PTC-Starter,

heck the resistance
of two terminals

PTC-Starter.

}_
I

}__

YES
NO

PTC-Starter.
Replace

YES
[_

[ Check OLR

Check if applying

I.__

YES

a regular OLR

I I Ioperation
by turning
_
I-_ 130 sec. in forcible OLPI

OLP works within

Replace

I -'

.[_
OLR

NO
t_

[ sChartieCnkg
state.

Measure minimum
starting voltage after 5
min. for baiencing cycle
pressure and cooling the
PTC.

I--_
I r I the voltage of Rating
I
I Voltage +_10%
_
I
below.

I I

Components
startin I_

-10-

o.K.
NO

I
}1-[_

6-2 PTC AND OLP
Observationvalue is
.._
220V/5OHz : 22_:_30%
115V/6OHz ; 6.8_.__+30%
240V/50Hz ; 33(_±30%
127, 220V/60Hz : 22_
±30%

Sl_rter from
Compressor and
measure
Separate the
the PTCresistance between
' No. 5 and 6 of PTCStarter with a Tester or

Compressor is
I Normal
operationof
impossible
or poor.

Wheatstone
(Figure 21)

Bridge.

The resistance
is 0 or several
hundred Q.

The value

Check

"_'

Compressor and check I
electric
the resistance value
I
I
between two terminals I
,
Separate
of OLP with
the aOLP
Tester.
fmm_ NLN0_
YES_ _

is _.

I
I

components.

OLR

(Figure 22)

(_Figure

electric components.

value

another

Replace

Check another

21_igure

6-3 DEFROST TIMER
Normal operation of
the Defrost Timer is
impossible.

the point of first click
sound and check the
Position the Cam Shaft to
current flowing between
terminals No. t(brown)
and No. 2(bright orange).

--_

The resistance

Shaft
the point
Next, to
position
the of
Cam
second click sound and
check the current flowing
between terminals

__The

OQ or
variable. is
resistance

___

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

__The

220VISOHz : 20K_
resistance
is about
1t 5V/6OHz
: 7.8K3.2

No defrosting.

Poor cooling.

- Turn the Cam

"-_

Shaft.

Replace the
Defrost Timer.

is _o.

Figure

Check the another

i
I
i

electric components.

Loud click sound.

-11

-I

"°

with holding the Cam
Shake and
about
Shaft
Body3 times
softly.

Defrost
Replace Timer.
the

6-4 OTHER ELECTRIC COMPONENTS
•

Cooling is impossible
Check ff cuwentflowsto

doesn't
ran.
Compressor

I I:_

I
a. Thermostat

Poor contacting
gas leakage.

b. Starting devices

,._Shorted

c. OLP

Poorsenta_ing
_ orshorted.

d. Compressor

or broken.

_ Poor contacting

f. Circuit parts ____-_--_"or

runs

Replace
indicated component. I

shorted.

voltage.
heck a starting

Low voltage.

.}_

to
starting
devices,
Check
if currant
flows

t._

and
Poor broken.
oontecting

in sub-coil of
heckcum_nt
Compressor.

___

Shorted.

flo_ng

and

_Coilshorted.

coil

e. Defrost Timer

J poorly.
Compressor

Cause

the following
component.

Raise the voltage.

_'--

iRndiP_t6_dcemp°ne_"

Check capacity of OLR
Lack of capacity.
The items described
above are normal.

•

_
_,_

Compressor.
oil of motor

Replece
the compressor.

Cooling ability is poor
i

doesn't run.

of
the door
S/W.flowing
Check
current

_._

Poor contacting.

Check current flowing
in the Fan Motor.

Coil is shorted.

Check the running

condition of Timer.

Check current flowing

indicated component.
I Fan motor

Much frost is built upon
the EVAPORATOR.
I---

components.
• Defrost Thermostat
the following
i of
• Fuse-M
Check current flowing
of the following
components.
• L-cord
• TE-Piate Heater

-I

Replace

Running is poor.

(Coil is shorted.)
indicated component.
Replace
I

Shorted.

I
-12-

Replace
indicated component. I

6-4 SERVICE DIAGNOSIS CHART

COMPLAINT

POINTS TO BE CHECKED

REMEDY

Cooling is
impossible.

•
•
•
•

Is the power cord unplugged from the outlet?
Check if the power Sh/V is set to OFF
Check if the fuse of power S/W is shorted.
Measure the voltage of power outlet.

Cooling ability
is poor.

• Check if the set is placed close to wall.
• Check if the set is placed close to stove, gas
cooker and direct rays
• Is the ambient temperature high or
the room door closed?
• Check if put In is hot.
• Did you open the door of the set too often
or check if the door is closed up?
• Check if the Control is set to WARM.

• Place toe set wfih the space of abeut 10 ctn (4 inches).
• Place the set apart from these heat
appliances.
• Make the ambient temperature beidw.

Foods in the
Refrigerator
are frozen.

• Is food placed in cooling air outlet.?
• Check if the Dial is set to COLD.
• Is the ambient temperature below 5°C?

• Place foods in high temperature
(Front Part)
• Set the dial to MID
• Set the dial to WARM.

Dew or ice
forms inside
the set.

• Is liquid food stored?
• Check if put in hot.
• Did you open the door of the set too
often or check iftbe door is closed,

• Seal up liquid foods w_th wrap.
- Put in foods after cooled down.
• Don't open the door too often and close
it firml_

Dew forms
in the Exterior Case.

* Check if ambient temperature and humidify
of surroumding air are high.
• Is there gap in the door gasket?

• Wipe dew with a dry cloth, This occurrence
is solved naturally in low temperature and humidity.
• Fill up the gap.

Abnormal
noise,

• Is the set positioned

- Adjust the Adjust Screw, and position
in the firm place.
• Remove the objects.

in a firm and even place?

• Are any unnecessary objects set
in the back side of the set?

Door does not
dose well,

• In addition

to the items

• Put in ti_ds

after cooled down.

• Don't open the door too often and dose
it firmly.
• Set the control to mid-position.
section.

• Fix it firmly on the original position.
• Place the cover at the original position.

• Check if the door packing is dirty
with filth such as juice.
• Is the set positioned in a firm and even ptace?

• Clean the door packing.

• Check if the inside of the set is dirty
• Did you keep fragrant foods without wrapping?
• It smells of plastic.

described

Checkif
dew forms
the freezer.

Cycle.
Check Refrigerating

Check the
Thermistor

Plug to the outlet.
Set the switch to ON
Replace fuse.
If voltage is low. correct wiring.

• Check if the Drip Tray is not firmly fixed.
• Check if the cover of mechanical room
in below and front side is taken out.

• Is too much food putted in the set?
Ice and foods
smell unpleasant.

•
•
•
•

left, refer to the followings
/
/

• Clean the inside of the set.
- Wrap fragrant foods.
* The new products smells of plastic,
will go away after 1-2 weeks.

the complaint.

Replace the
Components of
defrosting circuit.

Defrosting
is poor.

F
t

to solve

• Position in the firm place and level the
Adjust Screw.
• Keep foods not to reach the door.

is
faulty.
The
cycle

The operation of
the Thermistor is
poor.

-13-

Repair the cycle.

Replace the
Thermistor,

but it

6-5REFRIGERATING
CYCLE
• Troubleshooting

Chart
STATE OF
THE SET

CAUSE

PARTIAL
LEAKAGE
mr>
_m WHOLE

Low flowing sound of
Refrigerant is heard and
frost forms in inlet only

REMARKS

A little higher
than ambient
temperature.

- Refrigerant level is low due
to a leak.
• Normal cooling is possible
when injecting of Refrigerant
the regular amount.

Freezer

Flowing sound of refrigerant

Equal to ambient

• No discharging

compartment and
Refrigerator don't
cool normally,

is not heard and frost isn't
formed,

temperature.

• Normal cooling is possible
when injecting of Refrigerant
the regular amount.

PARTIAL
CLOG

Freeze
compartment and
Refrigerator don't
cool normally.

Flowing sound of refrigerant
is heard and frost forms
in inlet only.

A little higher
than ambient
temperature,

• Normal discharging of
refrigerant,
o The capillary tube is faulty.

WHOLE
CLOG

Freezer
Flowing sound of refrigerant
compartment and
is not heard and frost isn't
Refrigerator don'tcool. formed.

Equal to ambient
temperature.

• Normal discharging
Refrigerant.

Cooling operation
stops periodically,

Flowing sound of refrigerant
is not heard and frost melts,

Lower than
ambient
temperature

• Cooling operation restarts
when heating the inlet of
capillary tube.

Freezer end
Refrigerator

Low flowing sound of
refrigerant is heard and

A little higher
ambient

• Low pressure at high side
of compressor due to low

don't cool.

frost forms in inlet only.

temperature,

No compressing
operation,

Flowing sound of refrigerant
is not heard and no frost,

Equal to ambient
temperature,

MOISTURE
CLOG

O
O m
-o"n
:o m
mO
u)--I
_
O
t m

Freezer
compartment and
Refrigerator don't
cool normally,

TEMPERATURE
OF THE
COMPRESSOR

LEAKAGE

C>
m

u_
•_

STATE OF THE
EVAPORATOR

COMPRESSION

NO COMPRESSION

refrigerant

of Refrigerant.

level.

• No pressure of high pressure
part in the compressor.

• Leakage Detection
• Observe dischargingpointof refdgerant which may be in the oil dischargingpart in the compressorand hole of evaporator,

Check if compressor

YES

[
I Check if frost
Evaporator.
J'l forms
or not in

runs or not.

No frost
or forms

leaks or not.
_- Check if oil

in inlet only

Observe the discharged
amount of Refrigerant.
i

Fr°st f°rmed

n°rmalli

Normal areount
YES

_, No or much amount
Moisture Clog

Faulty

Inject refrigerant

Compressor,

and check cooling operation.

Check Compressor

I Clogged by dust.

to compressor

I
Frost formed normally

-14-

r
>! Gas leakage.
(Check

the

leakage

I
point)

• General Control

of Refrigerating

Cycle

NO.

EEMS

Pipe and
piping system
opening time

Min.

Pipe: within 1 hour.
Comp: within 10 minutes.
Drier: within 20 minutes.

TO protect
moisture
penetration.

The opening time should be reduced
to a half of the standards during rain
and rainy seasons (the penetration of
water into the pipe is dangerous).

Welding

Nitrogen
)ressure

Weld under Nitrogen
atmosphere.
(Nz pressure:
0.1-0.2 kg/cm z)

To protect oxide
scale formation.

- Refer to repair note in each part.
- R+134a refrigerant is more
susceptible to leaks than R-12 and
requires more care during welding,
- Do not apply ferce to pipes before and
a_er welding toprotect pipe from cracking.

N_ sealed
parts

Confirm
N2 leak

Confirm air leaking sounds
when removing rubber cap.
Sound: usable
No sound: not usable

To pre_ct
moi_ure
penetmtion+

- in case of evaporator parts, if it
doesn't make sound when removing
rubber cap, blow dry air or N2 gas for
more than 1 rain and use the parts.

RefUge_
r'a_0n time

Min.

More than 40 min_es

To removemoisture.

Cycle

UNIT

STANDARDS

PURPOSES

REMARKS

................._..................._...............................................................
÷....................................
_................................................................................
Vacul._m Tort
Below 0.03 (ref)
Note: Only applicable to the model
deg'ee
equipped with reverse flow
protect plate.
.................

*_..................

1...............................................................

÷ ....................................

Vacuum = EA

High and low pressure sides
are evacuated at the saree
time for models above 200 L

Vacuum
p_oing

Use R-134a exclusive
manifold,

.................

Pipe
coupler
.................

_ .................

i ...................

+ ....................................

Use R-134a exclusive.

R-134a exclusive.

Plug

R*134a exclusive.

+ ..............................................................................

÷ ....................................

_................................................................................

Refrigerant
weighing

Drier
replacement

To remove the
- Use R-134a exclusively for
R-134a refdgeratoc
moisture from
- Usa R-12 exclusivelyfor
pipe inside,
R-12 refrigerator.
- Replacedrierwhenever
repaiing
refrigerator
cyclepiping.

Leak check

- Do not use soapy water for

Do not mix with
R+I2 refrigerant,

Use R-134a exclusively.
Weighing allowance: +5g
Note: Winter: -5g
Summer: +5g

The rubber pipes for R-12 refrkJerant
shall be melted when they are used for
R-134a refrigerant (causes of leak.)

To protect R-12
refrigerant mixing.

1...............................................................

Ou*Jet
(Sod_et)

Vacuum efficiency can be improved
by operating compressor during
evacuation.
To protect mixing
of mineral and
ester oils.

1...............................................................

i ................................................................................

check. It may be sucked into
the pipe by vacuum.

I
I
-15-

Defect
refrigerant
area.

- Do not weigh the refrigerant at too
hot or too cold an area.
(77°F[25=C] Js adequate.)
- MakeCopperbombe(Devicefillingrefrigerant)
Socket: 2SV Plug: 2PV R-134a
Note: Do not bum O-dng (bushing)
during welding.

- Check oil leak at refrigerant leak
leak

area.
electronic
oil leakUse
is not
found. leak detector if
- The electronic leak detector is very
sensitive to halogen gas in the air. It
also sen detect R-141b in urethane.
Practice many times before using
this type of detector.

7. OPERATION
PRINCIPLE
ANDREPAIR
METHOD
OFICEMAKER
This manuel describes function of models adhering Ice Maker.
7-1 OPERATION

PRINCIPLE

7-1-1 Operation principle of Ice Maker

• Keep a level of ice-removing tray with "initial control" inputting
power.

Icing

Control

• Wait until when water within ice-removing
after starting ice-making operation.

--T-

tray becomes cold

. ice
erform
check operation"
to ensure
ice is tilled
at an
bank "ice
by carrying
out reverse
turning that
and forward
tumiog
the ice-removing motor. Perform =icing-removing operation for
dropping ices of ice-removing tray from the ice bank If ices
are not fully tilled.

t _water
Contr._...._
Supply _

• Perform "ice-removing control" after supplying water to the iceremoving tray by operating solenoid of the ice valve.

• As
operation
for the Test
assembty
and service
of refdgerator,
pressing
a "l/Maker
Switch"lineallows
to operate
in the order
of =initial -_ ice-removing --_ water supply" control step.

1. Turning the ice-making
2. Ice-making

stop switch off stops ice-making function of the ice-maker and thus no ice is made.

function stops at the time of selecting

ice-making function

and release of the ice-making

perform the initial control function again.

* Make sure the switch on the ice maker assy is turned "on".

-16-

function allows to

7-2 Function of Ice maker
7-2-1 Initial control function
1. The level of the ice-removing tray (ice-removing container) after completing the MICOM initialization in the initial POWER
ON,returning to elactdcity failure and turning-off of ice-making stop switches. Namely, detection lever operates up and down.
2. The level of ice-removing container is detected with high / low output signal of hall sensor.
In another words, operation is performed in order to keep a level by operating ice-removing
age could be applied in the MICOM PIN.

motor so that high or low volt-

3. No signal change of hall sensors until a minute after operating the ice-removing motor should be considered as failure. In
this case, stop the automatic ice-remover and then reset the ice-maker initialization if considered as normal after performing continuous check in a cycle of an hour.
4. Keeping of the ice-remeving

tray (ice-removing

container) should be considered

initial control is completed.

7-2-2 Water supply control function
1. Supply water into the ice-removing tray by operating the ice solenoid placed at the machine room of refrigerator using the
time check function if considered as the level is kept after performing a horizontal operation of the ice-making tray after
the ice-removing control (normal ice-rameving control, ice-removing control of test function) is completed.
2. The quantity of water supply is determined by supplying water for a constant using the dip switch.

i SWITCH NO
:t;Wl

$W2

Sy,_*

iOFF

OFF

Rema_s

TIME
_5_

The quantity of water supply may differ depending

I o_ ___ o_=_9=,,=
_FF

O_t

OFF

10_'_

the setting status of the dip switch or on water pressure

f21_

as water supply method is of a pattern of direct connaction to water cock.

3. The change of the quantity of water supply setting may be done according to the changed time even after changing it
without powering off. In the change of dip switch during water supply, it is done according to the water supply time previously established and then done according to the additionally changed time from the next water supply.
Water supply control switch

Line indicating the
adequate amount
of water supply.

L!Adequate
waterlevel.
* Adjust the water supply control switch to adjustthe
amount of water being supplied.
* Make sure it is adjusted to meet the line indicating the
adequate amount of water supply.
7-2-3

Ice-making

control

function

1. Ico-making control is related with when considered as water within ice-making tray (ice container) turns into ice completely after completing water supply operation and performs ice-making completion operation by detecting temperature
of ice-making tray. (ice-making sensor is mounted on the bottom of the ice-making tray).
2. fae-making

control begins after completing

water supply control or initial control.

3. It is considered that ice-making is completed if temperature
from the time water is supplied to the ice-making tray.

of ice-making

sensor arrives at -6°C after 60 minutes pass

4. It is considered that ice-making
pass at the above status.

of ice-making

sensor arrives at below -7°C after 10 minutes

is completed if temperature

-17-

7-2-4 Ice-removing
1. Ice-removing
completed.

control function

control means operation to separate ice within ice-making

tray ( ice-making

container) after ice-making is

2. Step to check ices stored at the ice bank (container for storing ice) are fully filled. It is considered as they are tully filled if
signals of the hall sensor are at the On status ("high") before 3.6seconds after rotating positively the ice-making
this case, the ice-making

motor. In

motor remains at the waiting status without performing ice-removing function.

Perform ice-detacfing operation after rotating positively the ica-making motor in the cycle of an hour if the full ice status is
detected Perform water supply control function after completing ice-removing function in the short of ices stored.
Reversely rotating the ice-removing motor in the storage of full ices and then let the motor stop at the position of the icemaking or waiting status.
3. Ice-removing control performs ica-removing operation immediately if ices stored at the ice bank (container for storing ice)
are not fully filled (the hall sensor are at the Off status ("low") within 3.6seconds after rotating positively the ice-making
motor). In this case, it positively rotates (CW) the ice-removing motor and keeps the ice-making tray at the maximum distortion status and makes ices be separated from the

ice-making tray. In this case. ice-detecting lever automatically oper-

ates lifting operation with ice-removing operation.
4. ice-removing control positively rotates (CW) the ice-removing motor and stops it for a second as it considers as maximum
distortion point (ica-detecting axle = 160 °) if the sensor signal changes from the Off status (=low") to the On status ("high")
after 3.6 seconds pass.
5. Ice-removing control positively rotates (CW) the ice-removing motor at the cycle of an hour if problems in ice-making
motor or hall sensor are found and performs initial operation or operates initialization of product if normal.
6. Ice-removing control stops for a second at the maximum distortion status of the ice-removing
ice).

tray (container for stodng

7. Step that the ice-removing tray stops for a second and then returns to the level. It returns to the level status returns to the
ic.e-removing tray by reversely rotating the ice-making motor.
8. The cycle of "water supply -* ice-making

• ice-removing

, returning to the lever if becoming the level status.

Maximum distortion point

______ p_

tn the short of

,
'

•

:,
;
a

stor.%___]
of hall sensor
Output signal

ON_

OFF

............................

Ice-detectionlevel300
Operation of

-8" O" 10"
LOCk

loe-ma_ng

....

32'

,
L ....
i

41"

i
J-.J.
i

i
i

53" 50"

80"

loe-detec_on

-18-

160" 170"
loe_emovallockLock

7-2-5 Test Function
1. Function used compulsory operation for the purpose of performing operation test. service and cleaning. This test function
is performed if pressing the test switch mounted on the automatic ice-maker itself for 0.5 second or more.
2. The test button operates when the test function is not input but at the level status. It does not perform ice-removal control
and water supply control if ices are full during operation of test function
3. Pressing the test button for more than 0.5 seconds at the level the status immediately

performs ice-removing

operation

irrespective of the ice generation conditions of the ice-making tray.
Caution shall be exercised as water may overflow if operating the test function at the water status that ice-making
done. A cycle of water supply is performed

at the level adjusting operation after ice-removing

Therefore, the test button allows to check problems

in ice-removing

4. The test function operates in the normal cycle of ice-making
water supply is completed,

operation, level operation and water supply.

-_ ice-removal _' returning

* To check on the amount of water being supplied, press
the Test button, (Hold for 0.5 seconds)

-19-

is not

operation.

to the level --_ water supply if

7-3 Failure diagnosis method of ice maker

I
Defect of power terminal
• Check DC power (5V,12V)

Defect of ice-maklng

sensor

[ Replacement

MAiN PCB

ice-making
Replacementsensor
of

I
I

• Check resistance values of
both ends of ice-making sensor
(Pin for PCB CON2 1,2 PIN)
• Ice-making sensor-Defect
between (PIN NO # 4 of IC1)
boards

Yes

Defect of ice-making

kit

Replacement of
ice-making

kit

Resistance values at both
ends of ice-removing motor
(# 7,8 pin of PCB CON2 7,8)
is 18_-22_ ?

Replacementof
MAIN PCB

I
I

Ddve circuit of ice-removing
motor 0C5 and auxiliary
circuit) is normal?
HALL IC-Defect between
(PIN NO # 20 of IC1) boards
Be sure ice-removing and
returning to the level when
pressing the TEST S/W

Defect of ice-making KIT TEST S/W

Replacementkit of
ice-making

Replacementof
water
supplyvalve

• Both ends of TEST SP,_/
(# 3,6 pin of PCB CON2 3,6)
are at open status?
• TEST S/W - Defect between
r

_"'_ormal
"_nd

boards (PIN NO #19 of IC1)

after the ice-'malting tray_

Defect of water supply

returning to the level with the/
• Water supply valve conduct
current?
• Water supply pump normally
operates?
• Water supply line is normally
connected?
Normal

- 20 -

7-4 Explanation of ice maker circuits
7-4-1 Power circuit

CONI

I1_

ICl

_o._°°(M[COM)
TEST

The secondary party of transformer consists of power (12Vdc) for driving display and relay and power (5Vdc) supplying
power to MICOM and IC.
In this case, voltage at each part is as follows:
/
Part

Both ends of VA1

Voltage

115Vac

BothendsofCE2

12Vdc

Both

ends of CE3

5Vdc

VA1 is parts for preventing over-voltage and noise and plays a role of protecting elements of the secondary part of transformer as the inside of element becomes short and is broken and power fuse is cut off when power of more than 175V is
applied.
7-4-2 Vibration

circuit

XlN

IC1
xc_T(MICOM)

Circuit used for synchronous clock generation for transmitting/receiving information of the inside logic elements of IC and
basic time generation for calculating time. Rated parts must be used as counting time is changed at the IC1 or the OSC1
does not operate if SPEC would be changed.
7-4-3

Reset circuit

The reset circuit is a cimult that initializes vadous parts such as RAM, etc inside of the MICOM (ICl) and starts the whole of
function from the initial status and 'low' voltage is applied for a constant time (10ms) at the reset terminal of the MICOM at
the start of power input.
The reset terminal is at 5V during general operation (the MICOM does not operate in the defect of the reset IC).

-21 -

7-4-4 Load drive circuit
1. Load drive status check

WAT RVALVEN
D5

(ICE)

(_//

Load Type
Measurement

KRCIO2MI
I
u
Ill.oK

---

Water Valve

Location

(_)

I V below

OFF

12V

Condition

- 22 -

I _A_

_
-_ O_

IC1

(MICOM)

7-4-5

ICE MAKER drive/circuit

7
P42

4.7KX2

(REVERSE)

(FORWARD)

IOOUF

/zov

CON2

(so^Iso
P43

ICI

(MICOM)

19
CCLOJlo4

P11

ccllJ.
104

(,4_7',

cc)2J_
io,,_

This circuit is a circuit used to embody functions such as ice-removing, full-ice detection,
perature detection of ice-making

tray (ice-making container).

- 23 -

level noise, and ice-making

tem-

7-5 Main PWB Assembly and Parts List
7-5-1 MAIN PWB

- 24 -

7-5-2 Replacement

Part List

No.

_o" c_5¢m_

SPl_f

M_ER

_170,B20_ P_*MNN

-j_:117V,C_15V r._ SI_
5170JB200:TRANSPC1--

FR-I(DS-t!07k) )00 S_

_MA_<
:-1.6
PRANS

WAFER

;MW250--OB

_JBSOON

;MW250-04

--_IRH17B12_
,EGt3__TO1)BA17812T ROHM iC2
m
=PC7812J_F NEC

UlCOM _1

_P87C409N

CON2
CON3
rO_PIBA

ICI(=O_JB2_

0_E70420_
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LG LRTBC2025T User Manual REFRIGERATOR Manuals And Guides L0301141

LG Top Mount Refrigerator Manual L0301141 LG Top Mount Refrigerator Owner's Manual, LG Top Mount Refrigerator installation guides

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