LG LRTP0931W Owner’s Manual

2. PARTS IDENTIFICATION

FREEZER

COMPARTMENT

Twisting Ice Service

Freezer Shelf

Freezer Temperature

Control Knob

REFRIGERATOR

COMPARTMENT

ChinedCompartment

Refrigerator Temperature

ControlMicom

Shelves

Lamp

Deodorizer

Vegetable Drawer

Used to keep fruits

and vegetables, etc.

fresh and crisp,

Base Grille

" Freezer Door Rack

- Egg Storage Rack

Refrigerator Door
Rack (optional)

Re_igerator Door

Rack

LevelingScrews

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3. DISASSEMBLY

3-1. DOOR

• Freezer Door

1. Remove the hinge cover by pulling it upwards.

2. Loosen hexagonal bolts attaching the upper hinge to the

body and lift the freezer door.

_ HINGE COVER

HINGE

BOLT

Figure 6

3. Pufioutthe doorgasketto remove from the doorfoam

assembly.

GASKET

3-2. DOOR SWITCH

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.

Figure 9

3-3. THERMISTOR

1. Remove the Cover Lamp-R by the use of slotted type
driver inserting in the low holes of the cover.

2. Loose 2 screw.

3. Pull the Control Box*Refrigerator.

4, Disconnect the Housing of lead wire.

5. Separate the INSU'Mulfi Duct and Control Box-Refrigerator.
6, Separate the Thermistor and Control Box-Refrigerator,

7. Separate the Thermistor and Display PCB.

- INSU'MULTI DUCT

Figure 7

• Refrigerator Door

1. Loosen hexagonal bolts attaching the lower hinge to the

body to removethe refrigerator door only.

LOWER HINGE

Figure 8

2. Pull out the door gasket to remove from the door foam
assembly,

_( DISPLAY PCS

-- -- THERMISTOR

-- CONTROL

LAMP-REFRIGERATOR

l

Figure 10

3-4. FAN AND FAN MOTOR

1. Remove the freezer sheff,

2. Separate the twist by pulling right.

3. Loose 1 screw.

4. Pull out the Gdlle Fan and Shroud-Freezer.

SCREW

Figure 11

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5. Disconnect the housing of lead wire.

6. Separate the Fan assembly.

7. Loose 2 screw attached to the Bracket.

8. Pull out Shroud-F remove the Fan Motor assembly.

9. Separate the Motor Bracket and bushing.
FAN MOTOR

SHROUD-FREEZER

'BRACKET

FAN

GRILLE FAN Figure 12

3-6. REFRIGERATOR ROOM LAMP

1. Remove the cover lamp-Refrigerator by pulling with a

slotted type driver.

2. Remove the lamp-Refrigerator by turning.

REFRIGERATOR ROOM LAMP

•_"_/ Figure 17

3-5. DEFROST CONTROL ASSEMBLY

Defrost Control Assembly consists of Defrost Sensor and

FUSE-M
Defrost Sensor functions to defrost automatically and it is

attached to the Evaporator and the metal side of the case
senses Temp.

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

At the temperature of 72°C, it turns the Defrost Heater off.

1. Pull out the shroud-Freezer after removing the Gnlle
Fan. (Figure 13)

2. Separate the connectors connected with the Defrost
Control Assembly and replace the Defrost Control

Assembly after cutting the _e Wrap. (Figure 14)

SHROUD-FREEZER

Figure 13

DEFROST CONTROL

ASSEMBLY

Figure 14

3-7. CONTROL BOX-REFRIGERATOR

1. Remove the Cover lamp-Re[rigerator.

BOX-REFRIGERATOR

COVER LAMP

FI

"gure 18

2. Loosen 2 screws.

3. Full the Control Box-Refrigerator.

4. Separate the lead wire Housing.

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3-8. REVERSING THE DOOR

• Precaution
1 Before reversing the door, remove all foods, shelves, etc. from the refrigerator.

2. Use the phillips Driver, Bolt Driver, Torque Wrench, or Spanner to fix or

remove the bolt.

3. Be sure not to drop the refrigerator or the doors while reversing the hinges.

Don't lay the refrigerator on its side while working on it; it will malfunction.

4. Be careful not to drop the door in disassembling or assembling the freezer or

the refrigerator door.

• HOW TO REPLACE THE DOOR OPENING TYPE

- Converting Door is Optional

Separate the cap O and upper hinge O-

Separating the center hinge O and the

refrigerator door 0-

Removing the freezer door O-

SeparaUng the lower hinge O.

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Reposition the adjustable screw assembly O. 6 Reassemble the lower hinge O.

@

Move the cap 0 and bracket 0 of the

refrigerator door.

° il

Reassemble the refrigerator door stopper O.

1 Move the pin position 0 of the upper hinge.

Move the cap _ and reassemble the center

hinge _ after removing the washer.

O

1/'11 Move the cap _ and replace the freezer door

t/O.

2 Assemble the upper hinge O and the cap _k

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4. ADJUSTMENT

4-1. COMPRESSOR

4-1-1. Role

The compressor intakes }ow temperature and low pressure
gas evaporated from Evaporator ofthe Refrigerator, and
condenses this gas to high temperature and high pressure

gas, and then delivers it _ the condenser.
4-1-2. Composition

The Compressor Assembly consists of a hermetica,y
sealed unit containing an electric motor, a compressor, and
their case. The PTC (Positive Temperature Coefficient) and

OLP (Overload Protector) are mounted outside the case.
The case is sealed to protect parts machined to one

micron (0.001 mm) and should not be opened.
4-%3. Note to Use

(1) Be careful not to allow over-voifage and over-current.

(2) Do not strike!

If applying force or pressure (dropping or careless
handling,) poor operation may result.

(3) Use proper electric components appropriate to the

Compressor.

(4) Note to Keep Compressor.

If the compressor _swet and the terminal pins rust, poor
contact and poor operation may result.

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

get into the refrigeration system during service. These
could cause leakage and noise.

4-2. PTC-STARTER

4-2-1. Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is no-contact

semiconductor starting device which uses ceramic
material consisting of BaT}O3.

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

value becomes. These features are used as starting
device of Motor.

4-2-2. Role of PTC-Starter
(1) The PTC is attached to the compressor and is used to

start the motor.

(2) The compressor in this refdgeretor is a single-phase

induction motor.

For normal operation of a single-phase induction motor,

in the starting operation, current flows in both the main
coil and the sub-coil. After starting, the current in the

sub coil is cut off. The PTC performs an these roles;
therefore it functions as a motor starting device.

4-2-3. PTC-Apptied Circuit Diagram

• According to Starting Method of Motor

OVERLOAD PROTECTOR

F-_-q // COMPRESSOR

, ,5 MOTOR

PTC STARTER HERMETIC

RSIR

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,

(2) During normal operation of Compressor Motor, PTC

elements generate heat continuously. Therefore,
if PTC isn_ cooled for a while after power off, Motor

can't operate again.

4-2-5. Relation of PTC-Starter and OLP
(1) If power off during operation of Compressor and power

on b_'ore PTC is cooled, (instant shut-off within 2 rain.
or reconnect a power plug due to misconnecting),

PTC isn'tcooled and a resistance value grows. As a
result, current can't flow to the sub-coil and Motor cen_t

operate and OLP operates by flowing over current in
only 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 the OLP doesn't operate when the PTC is not cooled,

the compressor motor wears away, causing a short and
fire. Therefore; always use a prepedy attached OLP.

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

(2) Do not stdke!

If applying force or pressure (dropping or careless
handling,) poor operation may result.

(3) Keep apart from any liquid.

If liquid such as oil or water inflows into PTC,
PTC materials if may break due to insulation

breakdown of matanal itself.

(4) Use ONLY the correct PTC for this operation. Purchase

part by part number, model number, and serial number.
Many PTCs may look and fit the same, but the

electrical characteristics may not match.

(5) Use a properly attached PTC.

TERMINAL

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4-3. OLP (OVERLOAD PROTECTOR)
4-3-1. Definition of OLP

(1) OLP (Overload Protector) is attached to the compressor and protects the motor by cutting off current to the motor when

the bimetallic strip opens the circuit when it overheats

(2) When over-volta9 e flows to Compressor motor. Bimetal works by heating the heater inside OLP.

and OLP protects Motor by cutting off current which flows to Compressor Motor.

4-3-2. Role of OLP
(1) OLP is attached to Hermetic Compressor used to Refrigerator and Show Case and prevents Motor Coil from being

started in the Compressor,

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

(Composition and connection Diagram of OLP

CONTACTING
POINT

COVER

___ BIMETAL

BIMETAL

SCREW

ADJUST

HEATER Figure 21

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6. TROUBLESHOOTING

6-1. COMPRESSOR AND ELECTRIC COMPONENTS

Remove the PTC-

[_ PowerSource.

Starter from the
Compressor and

measure the voltage
between Terminal C of

Compressor and
Terminals 5 or 6 of PTC.

__ (Rating Voltage YES

+10%)? i "[_

No Voltage.

Applied voltage isn't

]P- in the range of Rating

Voltage +10%.

Check the _ Check the resistance l YES
resistance of I ] among M-C, S-C and

Motor I I M-S in Motor Replace Compressor. I
Compressor. I I Compressor. I

[_ Check the _ Check the resistance of

[_ [ Check OLR

resistance of _ I two terminals in PTC-
PTC*Starter. _ LStarter.

a regular OLP. I 130sec. in forcible _[_

_ Check if applying _--'_"_ OLP w°rks within [ _-°-_ YES I

Replace OLP.

H OLP disconnected? YE_

I I Advisethesestomerto I J_J

usestandardpower;, h _]

condition.

Check connection I

Reconnect. I

I Ith i,.tlOVAC.60H=I I

NO _- Replace

YES

I I OLP operation by Replace OLP.
| turning instant power

/ on and off.

PTC-Starter.

starting state, starling voltage after 5

min. for batancing cycle

[_ I Check I_ Measure minimum

pressure and cooling the
PTC.

the voltage of Rating O.K.
Voltage ±10% below,

___ Components start in _ I

I .o

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6-2. PTC AND OLP

Compressor runs
poorly or not at all.

Separate the PTC-Starter
from Compressor and

measure the resistance
between No. 5 and 6 (only
RSIR type) or No. 4 and 5 of

PTC-Starter with a Tester or
Wheatstone Bridge.

(Figure 37)

Compressor and check the

--_ resistance value between
two terminals of OLP with

a Tester. (Figure 38)

t Separate the OLP from the YE__oS

Observation va]ue is
220V/50Hz : 22_30%
115V/60Hz : 6.8.Q_30%
240V150Hz : 33(L_30%
127, 220V/60Hz : 2211

-+30%

The resistance value is 0
or serveral hundreds _.

__The value is oo.

Check another
electric components.

Replace OLP.

electric
components.

_ heck other

PTC-Starter.

_ Replace

]

}

Figure 37 Figure 38

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6-3. OTHER ELECTRIC COMPONENTS

• Cooling is impossible

doesn't run.
Compressor {_>

Check if current flows to ]
the following / Cause.

components,i I

a, Thermistor Poor contacting.
b. Starting devices Shorted or broken.

c, OLP Poor contacting

d. Compressor coil Coil shorted.
e. Circuit Parts Poor contacting

r

or shorted.

or shorted.

1

z_> component.

Replace theapprq0nate

Compressor runs
poor y.

• Cooling ability is poor

doesn't run.

Fan motor

Much frost is stuck to

the evaporator.

___J Check a starting

vl voltage.

_ Checkif current flows _ Poor contacting

to starting devices. I _ I and broken.

in sub-coil of Shorted.

._ Check current flowing

Compressor.

i
/

The items described ILl Coil of motor

above are normal. _ Coropressor,

Check current flowing
in door S/W.

Check current flowing
in the Fan Motor.

ofthe _llowing
components.

• De[Sensor

Checkcurrentflowing _}_[Shorted.

•FUSE-M

_ Poor contacting.

_[ Coil is shorted.

Low voltage.

{ Raise the voltage.

__ _ Reptscethe appropnatecomponenL

_t Replacethe appropriatecomponent. ]

Replacetheappropriate
component.

_ eplacetheappropriate

component.

]
]

Check current flowing
of the following

components.

• L-Cord

• Plate Heater

_ eplace theappropriate

component.

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