GR-322W — LG Refrigerator Service Manual (repair manual)

Model
GR-322W
Pages
16
Size
500.57 KB
Type
PDF
Document
Service Manual
Brand
Device
Refrigerator
File
gr-322w.zip
Date

View LG GR-322W Service Manual online

4-1 COMPRESSOR
4-1-1 Role
The compressor inhales 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.
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 consists of 1/1000mm processing
precision components and is sealed after producing without dust
or humidity, deal and repair with care.
4-1-3 Note to Use
(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, poor operation and poor contact
may cause.
(5) Be careful that dust, humidity, and flux due to welding
don't inflow in Compressor inside in replacing
Compressor. Dust, humidity, and flux due to welding
which inflows to Cylinder may cause lock 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 and the material consists of BaTiO
3
.
(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) PTC is attached to Hermetic Compressor used for
Refrigerator, Show Case and starts Motor.
(2) Compressor for household refrigerator applies single-
phase induction Motor.
For normal operation of single-phase induction motor, in
the starting operation flows in both main coil and sub-
coil. After the starting is over, the current is cut off in
subcoil. The proper features of PTC play the above all
roles. So, PTC is used as a starting device of motor.
4-2-3 PTC-Applied Circuit Diagram
According to Starting Method of Motor
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 min. 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't 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 before PTC is cooled, (instant shut-off within 2 min.
or reconnect a power plug due to misconnecting), 
PTC isn't cooled and a resistance value grows. As a
result, current can't flow to the sub-coil and Motor can'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 OLP doesn't operate when PTC is not cooled,
Compressor Motor is worn away and causes circuit-
short and fire. Therefore, use a proper 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 inflows into PTC, 
PTC materials it may break due to insulation
breakdown of material itself.
(4) Don't change PTC at your convenience.
Don't disassemble PTC and mold. If damaging to
outside of PTC-starter, resistance value alters and poor
starting of compressor motor may cause.
(5) Use a properly fixed PTC.
4. ADJUSTMENT
- 8 -
OVERLOAD PROTECTOR
PTC
5
6
C
S
M
S
M
MOTOR
HERMETIC
TERMINAL
RELAY
RSIR
COMPRESSOR
Figure  20
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 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
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
- 9 -
CONTACTING
POINT
HEATER
TERMINALS
BIMETAL
COVER
CONTACTION
POINT
ADJUST
SCREW
BIMETAL
HEATER
Figure  21
NOTE : This is a basic diagram and specifications vary in different localities.
3
BK
COMP -
RESSOR
CAPACITOR  PART PTC STARTER
GN
(GN/YL)
BK
BK
BK
BK
BK
F.I.R
LAMP
F.I.R
LAMP
F.I.R  PART 
FUSE  PART 
EARTH PART
YL
(250V/15A)
PR
YL
GY
BK
BN
BO
WH
(A)
(B)
WH
WH
DEFROST. TIMER
THERMOSTAT
EARTH PART
BL
RD
RD
BL
RD
RD
BL
PK
BL
BL
OVER  LOAD
PROTECTOR
LAMP
  -R
FUSE-M(72 C
)
FAN  MOTOR
CAPACITOR
  F/L
POWER  SUPPLY
CORD
CAPACITOR-S
DEF-THERMO
CAPACITOR-R
6
5
2
3
1
4
2
S
C
M
T
WH : WHITE        BL  : BLUE          RD : RED            PK : PINK           
BK : BLACK         BN : BROWN      PR : PURPLE     YL : YELLOW
BO : BRIGHT ORANGE                  GY : GRAY         GN : GREEN 
3854JD1031B
F.I.R PART CAN BE APPLIED 
BY THE REQUEST OF BUYERS.
CAPACITORS, THE PLUG TYPE, 
AND EARTH PART ON CIRCUIT
DIAGRAM ARE SUBJECT TO
CHANGE IN DIFFERENT 
LOCALITIES.
FUSE & F.I.R SPECIFICATION
NON FUSE
100V ~ 127V
250V 15A
(B)
(A)
250V 9A
200V ~ 240V
    FUSE
ITEM
RATING
    F.I.R
CIRCUIT DIAGRAM
M
(250V/9A)
DOOR 
S/W-R
3-1 DOOR
● 
PRECAUTION
1. Before replacing the
door opening type,
first of all, you should
take out of foodstuffs
and accessories like
shelves or trays, and
so on which are not
fixed in the
refrigerator.
2. Use the ‘+’Driver,
Bolt Driver, Torque
Wrench or Spanner
to fix or remove the bolt.
3. Be careful not to fall down the refrigerator in
disassembling or assembling the Hinge Lower and the
Adjustable Screw Asm.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.
5. This refrigerator, according to the install position or
user’s liking, can be used as the type of opening from
the right or the left.
HOW TO REPLACE THE DOOR OPENING TYPE
(when converting from the left-opening type to right
opening type)
1. Separate the Cap 
A
and Hinge Upper 
B
.
2. Separating the Freezer Door 
C
.
3. Separating the Hinge-C 
D
and the Refrigerator Door 
E
.
4. Separating the Hinge Lower 
G
.
5. Move the Position of Adjustable Screw Assembly 
G
.
6. Assemble the Hinge Lower 
F
.
7. Move the Cap 
H
, Bracket 
I
of the Refrigerator Door.
8. Move the Cap 
J
and Assemble the Hinge-C 
D
.
9. Assemble the Door Stopper-F 
K
for Right Opening Type.
3. DISASSEMBLY
- 6 -
4
5
2
1
3
7
7
6
9
8
10
4
11
3
- Converting Door is Optional
Page of 16
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Download LG GR-322W Service Manual (Repair Manual)

Here you can view online or download LG GR-322W Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair LG GR-322W Refrigerator. Information contained in LG GR-322W service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).