LG LRBP1031W, LRBP1031T, LRBP1031NI Owner’s Manual
SERVICING PRECAUTIONS
Air Recharging in Compressor
Test the refrigeration by connecting itelectrically before
refilling operation. It is necessary to ascertain the function
of the meter-compressor and identify the defects
immediately. If defects have been found, empty the old
system of possible R134a 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
solder it to the same tube again. (Figure 2)
POINTTO BE
BROKEN
SERVICE TUBE EXTENSION
Figure 1 Figure 2
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 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
EXTENSION
MALE HANSEN
SOLDERING POINT
vacuum operation is over, add the quantity in grams of
R134a to the refrigeration system. Remember that every
system has an exact quantity of R134a with a tolerance of
+5 grams that can be added. (Figure 4)
q\ i TO TiE R134aCYLINDER
'__ TOsTTHEEMREFRiGEF_lr_ N4
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
UM
PRESSURE
GAUGE
igure 3
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)
In case that a considerable leakage occurs it will be
necessary to stop the vaccum pump and to add a small
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
blocks 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
TO THE VACUUM PUMP
In addition, check the graduated scale on the cylinder for
the quantity of R134a to be added, for example, if we have
750 grams of Freon in the cylinder and must add 165
grams to the group, this amount will be reached when R-
134a has dropped to 585 grams, remembering that the
indicator shows a lower limit of meniscus. De 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 R134a flow into the system, open the valve
placed at the base of the cylinder and 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
the 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, in the safe way until reaching the
quantity of R134a established for the system being
charged. When the system is running, the suction pressure
must be stabilized between 0.30 to 0.6 atmosphere.
Figure 5
-3-
98.12.04 80/120
CIRCUIT DIAGRAM
_a
BK
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DISPLAY CONI_OL P_.B
PWBASSY,MAIN
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LOC_JTE8 ANDP_CO RDAk_E
wr_ MOOEL_tPE
. W_EN 6TARTMS ce,aJcrrcR
_sNOTLetuP, MC_4 _ PTC
STARTISCONNE,_TED
_rTERNALLy
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C,_PA_m3_ p,TJC E_RmP/_T
3854JD1026A
BK:BLACK BN:BROWN RD:RED BO:BRIGHTORANGE
YL:YB.LOW GN,GREB_ BL:BLUE PR:PURPLE GY:GRAY WH:WHITE
SB:SKYBLUE PK:PINK GF_.:GREEN/YELLOW WH_K.'WHITF.._LACK
PARTS IDENTIFICATION
FreezerTemperature _
Control
Removable
Glass Shelf(2 or 3)
Lam
Multi-air Flow
Fresh Meat Kee
(Optional)
Temperature Control
Used to keep fruits
and vegetables, etc.
fresh and crisp.
or 2)
Door Basket
(3 or 5)
Utility Comer
(movable)
Bottle Holder
-2J_ Bottle
Door Basket
Compartment
Plinth
NOTE : This is a basic model. The shape of refrigerator is subject to change.
-5-
Screw
REPLACEMENT OF DOOR OPENING TYPE
1. PRECAUTION
1) Before reversing the door, first of all, you should take
out food and accessories like shelves or trays which are
not fixed in the refrigerator.
2) Use Torque Wrench or Spanner to fix or remove the
bolt.
3) Don't lay the refrigerator down in working with it, it will
cause to get out of order,
4) Be careful not to drop the door in disassembling or
assembling the freezer or the refrigerator door.
2. HOW TO REVERSE THE DOORS
1) Seperate screw O and remove lower cover O and move
cap lower cover 0. And, seperate screw O, lower hinge
!_, and remove pin O. Separating the freezer door @ in
opening, and more the position the cap I@.
2) Separating screw @ and remove the center hinge @
and the refrigerator door @. Move the position of cap@.
3) Move the position of upper hinge pin @, and cap @.
Assemble the refrigerator door @.Assemble center
hinge @ and bolt @, Assemble freezer door @,
Assemble the lower hinge @, bolt O and lower cover 0.
@
-6-
DISASSEMBLY
1 DOOR
• Freezer Door
1) Loosen 2 screws and pull the Lower Cover.
2) Loosen hexagonal bolts fixing the lower hinge to the
body to remove the freezer door only.
Lower Hinge
_ Figure 6
3) Pull out the Door Gasket to remover from the
Door Foam Assy, F.
GASKET
2 DOOR SWITCH
1) Loosen four screws in upper part and disconnect top
cover.
2) Disconnect Lead Wire from switch.
3) Disengage hook behind the switch by pressing it with
hands.
Figure 9
3 REFRIGERATOR ROOM LAMP
1) Remove the Cover Lamp, R by pulling with a '-' type
driver.
2) Remove the Lamp by turning.
Figure 7
• Refrigerator Door
1) Loosen hexagonal bolts fixing the center hinge(Hinge,C)
to the body to remove the refrigerator door only.
e,C
Figure 8
2) Pull out the Door Gasket to remove from the
Door Foam Assy, R.
Figure 10
-7-
4 FAN AND FAN MOTOR
1) Remove freezer drawers.
2) Remove two cap, screws and loosentwo screws in Grille Fan.
3) Pull out the Grille Fanand Shroud, R
4) Disconnect the housing of lead wire.
5) Separate the Fan Assy.
6) Losse 2 screw fixed to the Bracket.
7) Pull out Shroud, F remove the Fan Motor Assy.
8) Separate the Motor Bracket and Rubber.
6 DAMPER CONTROL
1) Remove the Cover Lamp, R and loosen 2 screw.
2) Pull the Control Box, R and separate the lead wire
housing.
3) Remove the Cover Lamp, R.
4) Separate the Insulation Multi Duct and Control Box, R.
5) Disassemble the Knob.
6) Separate the Damper Control and Control Box, R.
7) Separate the Damper Control and Resistor.
8) Disconnect the lead wire.
FAN MOTOR
_L3-_ " GRILLE
_,"_k "', Figure 11
5 DEFROST CONTROL ASSY
Defrost Control Assy consists of Thermistor and Fuse, Melting.
Thermistor functions to defrost automatically and it is attached to
metal side of the Evaporator and senses temperature,
Fuse, Melting is a kind of safety device for preventing overheating
of the Heater when defrosting,
At the temperature of 72°C, it stops the emission of heat from the
Heater,
1) Pull out the Shroud, F after removing the Gdlle,
2) Separate the connector connected with the Defrost Control
Assy and replace new one.
REFRIGERATOR ROOM LAMP
Figure 13
7 HEATER, SHEATH
In this refrigerator, Heater, Sheath is used for defrosting
heater. During heating, the temperature of heater rises
about 300-500°C. Therefore, be careful not to burn while
servicing.
1) After removing the Grille and Shroud, separate the
Heater, Sheath by disconnecting the connectors.
2) Exchanged Heater, Sheath and connected the housing.
Melting
Figure 12
Heater, Sheath
Figure 14
-8-
ADJUSTMENT
1 COMPRESSOR
1) 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 delivering role to Condenser.
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 consists of 1/1000ram processing
precision components and is sealed after production in absence
of dustor humidity, deal and repair with care.
3) Note for Usage
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike
If applying forcible power or strike (dropping or careless
dealing), poor operation and noise may occur.
(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.
(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.
2 PTC-STARTER
1) Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is a no-contact
semiconductor starting device which uses ceramic
material and this material 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.
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 is over, the current in
subcoil is cut off. The proper features of PTC play all
the above roles. So, PTC is used as a motor starting
device.
3) PTC-Applied Circuit Diagram
• According to Starting Method for the Motor
OVERLOAD PROTECTOR(O.L.P)
PTCq= _ COMPRESSOR
PTC STARTER HERMETIC
RSIR
4) Motor Restarting and PTC Cooling
(1) For restarting after power off during normal
Compressor Motor operation, plug the power cord after
5 min. for pressure balance of Refrigerating 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.
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 shut-
off within 2 min. or reconnect a power plug due to
misconnecting), 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.
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 materials 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. Ifthe 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 properly fixed PTC.
TERMINAL
Figure 19
-9-
30LP (OVER LOAD PROTECTOR)
1) Definition of OLP
(1) OLP (OVER LOAD PROTECTOR) is attached to the
Hermetic Compressor and protects the Motor by cutting
off current in Compressor Motor in case of over-rising
temperature by Bimetal 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.
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) De not turn the Adjust Screw of the OLP in any way for
normal operation of the OLP.
(Composition and connection Diagram of OLP)
CONTACTINGD
POINT
ADJUSTB
SCREW
COVER
BIMETAL
BIMETAL
CIRCUIT DIAGRAM
CIRCUIT DIAGRAM
HEATER
Figure 20
BK:BLACK BN:BROWN RD;RED BOBRIGHTORANGE
YL:YELLOW GN:GREEN BL:BLUE PR;PURPLE GY:GRAY WH:WHITE
SB:SKYBLUE PK:PINK GN/YL:GREENHELLOW WH/BK;WHITEtBLACK
NOTE :1. This is a basic diagram and specifications vary in different localities.
-10-
3854JD1026A
TROUBLESHOOTING (Mechanical Part)
1 COMPRESSOR AND ELECTRIC COMPONENTS
Source.
Power
Check the
resistance of
Motor
Compressor.
Remove the PTC-
]_ Starter from the
Compressor and
measure the voltage
between Terminal C of
Compressor and
Terminals 5 or 6 of PTC.
in the range of Rating
}Dj Applied voltage isn't
Voltage _+10%.
among M-C, S-C and
M-S in Motor
_ heck the resistance
Compressor.
(Rating Voltage
_+10%)?
OLP disconnected?
Advise the customer
to use a regular
Trans.
YES
Replace Compressor.
YES _
YES Replace OLR
condition.
_ Check connection
Reconnect.
Check the
resistance of
PTC-Starter.
Check OLR
Check
starting state.
two terminals in PTC-
_I heck the resistance of
Starter.
a regular OLP.
_ heck if applying
starting voltage after 5
min. for balancing cycle
pressure and cooling the
_,_ easure minimum
PTC.
NO _- PTC-Starter.
YES
YES
30 sec. in forcible
OLP operation by Replace OLP.
turning instant power
OLP works within b YES
on and off.
the voltage of Rating
Voltage -+10%below.
_ Components start in
I NO
I Replace
O_K_
-11 -
2 PTC AND OLP
Normal operation of
Compressor is
mposs b e or poor.
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-Stader with a Tester or
Whistone Bridge.
(Figure 21)
Separate the OLP from the
Compressor and check the
resistance value between
two terminals of OLP with
a Tester. (Figure 22)
Observation value is
220V/50Hz :22§ _+30%
115V/60Hz : 6.8§ _+30%
240V/50Hz :33§ _+30%
127, 220V/60Hz : 22§
+_3O%
or serveral hundreds §.
. 'oros,'a c v esOt
_ Check another
electric components.
}_ Replace OLP.
electric
t Check another
components.
Replace
PTC-Starter.
Figure 21 Figure 22
-12-
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