LG GR-T622 User manual

CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
MODEL: GR-T622/GR-T722
REFRIGERATOR
SERVICE MANUAL

SAFETY PRECAUTIONS....................................................................................................................................................... 2
SERVICING PRECAUTIONS.................................................................................................................................................. 3
SPECIFICATIONS................................................................................................................................................................... 4
PARTS IDENTIFICATION....................................................................................................................................................... 5
DISASSEMBLY.................................................................................................................................................................... 6-7
DOOR................................................................................................................................................................................... 6
DOOR SWITCH.................................................................................................................................................................... 6
THERMOSTAT ..................................................................................................................................................................... 6
FAN AND FAN MOTOR........................................................................................................................................................ 7
DEF' CONTROL ASM .......................................................................................................................................................... 7
LAMP.................................................................................................................................................................................... 7
CONTROL BOX-R................................................................................................................................................................ 7
ADJUSTMENT........................................................................................................................................................................ 8
COMPRESSOR.................................................................................................................................................................... 8
PTC-STARTER..................................................................................................................................................................... 8
OLP (OVERLOAD PROTECTOR) ....................................................................................................................................... 9
CIRCUIT DIAGRAM................................................................................................................................................................ 9
TROUBLESHOOTING..................................................................................................................................................... 10-15
COMPRESSOR AND ELECTRIC COMPONENTS ........................................................................................................... 10
PTC AND OLP.................................................................................................................................................................... 11
DEFROST TIMER .............................................................................................................................................................. 11
ANOTHER ELECTRIC COMPONENT............................................................................................................................... 12
SERVICE DIAGNOSIS CHART.......................................................................................................................................... 13
REFRIGERATING CYCLE............................................................................................................................................ 14-15
EXPLODED VIEW .......................................................................................................................................................... 16-17
REPLACEMENT PARTS LIST............................................................................................................................................ 18-
CONTENTS
- 2 -
Please read the following instructions before servicing your
refrigerator.
1. Check the refrigerator for current leakage.
2. To prevent electric shock, unplug before servicing.
3. Always check line voltage and amperage.
4. If you use any kind of appliance, check regular current,
voltage and capacity.
5. Don't touch metal products in the freezer with wet
hands. This may cause frostbite.
6. Prevent water from following onto electric elements in
the mechanical parts.
7. Close the top door before opening the bottom door.
Otherwise, you might hit your head when you stand up.
8. When tilting the refrigerator, remove any materials on
the refrigerator, especially the thin plates(ex. Glass
shelf or books.)
9. When servicing the evaporator, wear cotton gloves.
This is to prevent injuries from the sharp evaporator
fins.
10. Leave the disassembly of the refrigerating cycle to a
specialized service center. The gas inside the circuit
may pollute the environment.
SAFETY PRECAUTIONS

AIR RECHARGING IN COMPRESSOR
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)
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)
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 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
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
±5 grams that can be added. (Figure 4)
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)
In addition, 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 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 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 between 0.30 to
0.6(0.10 to 0.4) atmosphere.
SERVICING PRECAUTIONS
- 3 -
POINT TO BE BROKEN
SERVICE TUBE EXTENSION
CHARGE TUBE
EXTENSION FEMALE HANSEN
MALE HANSEN
SOLDERING POINT
Figure 1 Figure 2
TO THE
VACUUM
PUMP
PRESSURE
GAUGE
Figure 3
TO THE R-134a CYLINDER
TO THE REFRIGERATION
SYSTEM
Figure 4
FILLING OR
CHARGE TUBE VALVE TO BE OPENED WHEN REFILLING
VALVE TO BE CLOSED
AFTER VACUUM
TO THE CHARGE
CYLINDER
TO THE REFRIGERATION
SYSTEM
TO THE
VACUUM
PUMP
Figure 5

1. SPECIFICATIONS
- 4 -
ITEMS SPECIFICATIONS
DOOR DESIGN Side Rounded
DIMENSIONS (mm) 750
X 723 X 1732(W X D X H)
NET WEIGHT (kg) 90
COOLING SYSTEM Fan Cooling
TEMPERATURE CONTROL Knob Dial
Full Automatic
DEFROSTING SYSTEM Heater Defrost
With a Timer
DOOR FINISH Embossed Metal
HANDLE TYPE Bar
INNER CASE ABS Resin
INSULATION Polyurethane Foam
ITEMS SPECIFICATIONS
VEGETABLE TRAY Transparent Drawer Type
COMPRESSOR PTC Starting Type
EVAPORATOR Fin Tube Type
CONDENSER Wire Condenser
REFRIGERANT R-134a (140 g)
LUBRICATING OIL Freol @ 15G (320 cc)
DEFROSTING DEVICE SHEATH HEATER
FREEZER 15 W*
LAMP REFRIGERATOR 40 W
ITEMS SPECIFICATIONS
DOOR DESIGN Side Round
DIMENSIONS (mm) 750
X 776 X 1732(W X D X H)
NET WEIGHT (kg) 93
COOLING SYSTEM Fan Cooling
TEMPERATURE CONTROL Knob Dial
Full Automatic
DEFROSTING SYSTEM Heater Defrost
With a Timer
DOOR FINISH Pre Coated Metal
INNER CASE ABS Resin
INSULATION Polyurethane Foam
ITEMS SPECIFICATIONS
VEGETABLE TRAY Transparent Drawer Type
COMPRESSOR PTC Starting Type
EVAPORATOR Fin Tube Type
CONDENSER Wire Condenser
REFRIGERANT R-134a (140 g)
LUBRICATING OIL Freol @ 15G (320 cc)
DEFROSTING DEVICE SHEATH HEATER
FREEZER 15 W*
LAMP REFRIGERATOR 40 W
1-1. Ref. No.: GR-T622DE
1-2. Ref. No.: GR-T722DE
* Freezer lamp is optional part.
* Freezer lamp is optional part.

2. PARTS IDENTIFICATION
- 5 -
FREEZER
COMPARTMENT
Freezer Temperature
Control Dial
Automatic Ice Maker
and Ice Bank
(Optional)
Freezer Shelf
Door Cooling
On the refrigerator door,
the cold air passageway is
installed to supply
cold air to the doorside of
the refrigerator
compartment.
Temperature
Control Dial
Lamp
Shelves
Snack Corner
Crisper
Used to keep fruits
and vegetables
fresh and crisp.
Freezer Door Bin
Refrigerator Door
Rack
Dairy Corner
Can Server
Adjustable
Door Bin
Leveling Screw
(Inside)
Base Grille
General Type
Ice Tray (Optional)
Wine Rack (Optional)
Lamp (Optional)

3-1 DOOR
● Freezer Door
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.
3. Pull out the door gasket to remove from the door foam
Ass'y.
●Refrigerator Door
1. Loosen hexagonal bolts fixing the lower hinge to the
body to remove the refrigerator door only.
2. Pull out the door gasket to remove from the door foam
Ass'y.
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.
3-3 THERMOSTAT
1. Remove Control Box-R by loosening 2 screw fixed to
ceiling of Refrigerator compartment (Figure 10)
2. Separate the thermostat and dial knob F.
3. Remove the thermostat by disconnecting the lead wire.
3. DISASSEMBLY
- 6 -
BOLT
HINGE
HINGE COVER
Figure 6
GASKET
Figure 7
LOWER HINGE
BOLT
Figure 8
DOOR SWITCH
LEAD WIRE
Figure 9
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 Grille 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.
3-5 DEF' CONTROL ASSY
Def control Assy consists of Defrost Thermostat and 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-
heating of the Heater when defrosting.
At the temperature of 77°C, it stops the emission of heat
from the Heater.
1. Pull out the Grille Ass'y.
2. Separate the connector connected with the Def Control
Assy and replace the Def Control Assy after cutting the
Tie Wrap. (Figure 14)
3-6 LAMP
3-6-1 Freezer room lamp
1. Unplug the power cord from the outlet.
2. Remove the room lamp lid by taking down while pushing
it backward with your hand after grabbing the hook of
lamp lid as shown in the figure at right.
3. Remove the lamp by turning it clockwise and replace new one.
4. Assemble in reverse order of disassembly.Replacement
bulb must be the same specification as original. (Max 15W)
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.
2. Remove the Control Box-R by pulling it downward.
3. Disconnect the L/wire on the right position and seperate
timer, themostat, Lamp socket, etc.
- 7 -
FAN
BRACKET
SHROUD
GRILLE
FAN MOTOR
Figure 12
SHROUD-F
Figure 13
DEF-THERMO
FUSE-M
HOLDER FUSE
Figure 14
CONTROL BOX
COVER LAMP
Figure 17
FREEZER ROOM LAMP
Figure 15
REFRIGERATOR ROOM LAMP
Figure 16

4-1 COMPRESSOR
4-1-1 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.
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 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-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 lockage 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 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.
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 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.
4-2-3 PTC-Applied Circuit Diagram
● According to Starting Method for the 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 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 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.
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 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. 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 properly fixed PTC.
4. ADJUSTMENT
- 8 -
PTC STARTER HERMETIC
TERMINAL
COMPRESSOR
MOTOR
C
M
SM
36
5
S
PTC
OVERLOAD PROTECTOR(O.L.P)
RSIR
Figure 19

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)
- 9 -
5. CIRCUIT DIAGRAM
CONTACTING
POINT COVER
BIMETAL
CONTACTING
POINT
HEATER
TERMINALS
ADJUST
SCREW
HEATER
BIMETAL
NOTE : 1. This is a basic diagram and specifications vary in different localities.
Figure 21

6. TROUBLESHOOTING
- 10 -
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
1
2
3
4
5
2
5
5
3
5
4
5
5
1
43
YES
YES
YES
YES
NO
NO
YES YES
YES
NO
NO
NO
Power Source.
No Voltage.
(Rating Voltage
±10%)?
Replace OLP.
Reconnect.
Replace
PTC-Starter.
Replace OLP.
O.K.
Check connection
condition.
OLP disconnected?
Advise the customer
to use a regular
TRANS.
Replace Compressor.
OLP works within
30 sec. in forcible OLP
operation by turning
instant power on and
off.
Components start in
the voltage of Rating
Voltage ±10%
below.
Applied voltage isn't
in the range of Rating
Voltage ±10%.
Remove the PTC-
Starter from the
Compressor and
measure the voltage
between Terminal C of
Compressor and
Terminals 5 or 6 of PTC.
Check the resistance
among M-C, S-C and
M-S in Motor
Compressor.
Check the resistance
of two terminals in
PTC-Starter.
Check if applying
a regular OLP.
Measure minimum
starting voltage after 5
min. for balancing cycle
pressure and cooling the
PTC.
Check the
resistance of
Motor
Compressor.
Check the
resistance of
PTC-Starter.
Check OLP.
Check
starting state.

- 11 -
6-2 PTC AND OLP
65
YES
NO
NO
YES
NO
Cam Shaft
Normal operation of
Compressor is
impossible or poor.
Separate the PTC-
Starter from
Compressor and
measure the
resistance between
No. 5 and 6 of PTC-
Starter with a Tester or
Whistone Bridge.
(Figure 21)
Separate the OLP from
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§
±30%
The resistance value
is 0 or several
hundreds §.
The value is ¡˜.
Check another
electric components.
Replace OLP.
Check another
electric components.
Replace PTC-
Starter
Figure 21 Figure 22
Figure 23
Normal operation of
the Defrost Timer is
impossible.
No defrosting.
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.
Shake about 3 times
with holding the Cam
Shaft and Body softly.
The resistance is ¡˜
The resistance is
0§or variable.
The resistance is about
220V/50Hz : 20K§
115V/60Hz : 7.8K§.
Loud 'click' sound.
Replace the
Defrost Timer.
Replace the
Defrost Timer.
Replace the
Defrost Timer.
Check the another
electric components.
Replace the
Defrost Timer.
6-3 DEFROST TIMER

- 12 -
▼Cooling is impossible
Compressor
doesn't run.
Running state of
Compressor is poor. Check a starting
voltage.
Check if current flows to
the following
components.
a. Thermostat
b. Starting devices
c. OLP
d. Compressor coil
e. Defrost Timer
f. Circuit parts
Low voltage.
Poor contacting and
gas leakage.
Shorted or broken.
Poor contacting
or shorted.
Coil shorted.
Poor contacting
or shorted.
Poor contacting
and broken.
Shorted.
Lack of capacity.
Coil of motor
Compressor. Replace the compressor.
Replace
each component.
Raise the voltage.
Replace
each component.
Cause
Check if current flows
to starting devices.
Check current flowing
in sub-coil of
Compressor.
Check capacity of OLP.
The items described
above are normal.
▼ Cooling ability is poor
Fan motor
doesn't run.
Much frost are sticked
to the EVAPORATOR.
Poor contacting.
Coil is shorted.
Shorted.
Replace
each component.
Replace
each component.
Replace
each component.
Running is poor.
(Coil is shorted.)
Check current flowing
of the door S/W.
Check current flowing
in the Fan Motor.
Check the running
condition of Timer.
Check current flowing
of the following
components.
• Defrost Thermostat
• Fuse-M
Check current flowing
of the following
components.
• L-cord
• TE-Plate Heater
6-4 ANOTHER ELECTRIC COMPONENTS

6-4 SERVICE DIAGNOSIS CHART
- 13 -
COMPLAINT POINTS TO BE CHECKED REMEDY
Cooling is • Is the power cord unplugged from the outlet? • Plug to the outlet.
impossible. • Check if the power S/W is set to OFF. • Set the switch to ON.
• Check if the fuse of power S/W is shorted. • Replace a regular fuse.
• Measure the voltage of power outlet. • If voltage is low, wire newly.
Cooling ability • Check if the set is placed close to wall. • Place the set with the space of about 10cm.
is poor. • Check if the set is placed close to stove, gas • Place the set apart from these heat
• cooker and direct rays. • appliances.
• Is the ambient temperature high or • Make the ambient temperature below.
• the room door closed?
• Check if put in is hot. • Put in foods after cooled down.
• Did you open the door of the set too often • Don't open the door too often and close
• or check if the door is closed up? • it firmly.
• Check if the Control is set to WARM. • Set the control to mid-position.
Foods in the • Is foods placed in cooling air outlet? • Place foods in high temperature section.
Refrigerator • (Front Part)
are frozen. • Check if the Dial is set to COLD. • Set the dial to MID.
• Is the ambient temperature below 5°C? • Set the dial to WARM.
Dew or ice • Is liquid food stored? • Seal up liquid foods with wrap.
forms in the • Check if put in is hot. • Put in foods after cooled down.
chamber of • Did you open the door of the set too • Don't open the door too often and close
the set. • often or check if the door is closed up. • it firmly.
Dew forms • Check if ambient temperature and humidity • Wipe dew with a dry cloth. This occurrence
in the Exterior Case. of surroumcling air are high. • is solved naturally in low temperature and humidity.
• Is there gap in the door packed? • Fill up the gap.
Abnormal • Are the set positioned in a firm and even place? • Adjust the Adjust Screw, and position
noise generates. • in the firm place.
• Are any unnecessary objects set • Remove the objects.
• in the back side of the set?
• Check if the Drip Tray is not firmly fixed. • Fix it firmly on the original position.
• Check if the cover of mechanical room • Place the cover at the original position.
• in below and front side is taken out.
To close the door • Check if the door packing is dirty • Clean the door packing.
is not handy. • with filth such as juice.
• Is the set positioned in a firm and even place? • Position in the firm place and adjust the
• Adjust Screw.
• Is too much food putted in the set? • Keep foods not to reach the door.
Ice and foods • Check if the inside of the set is dirty. • Clean the inside of the set.
smell unpleasant. • Did you keep smelly foods without wrapping? • Wrap smelly foods.
• It smells of plastic. • The new products smells of plastic, but it is
• eliminated after 1-2 weeks.
●In addition to the items described left, refer to the followings to solve the complaint.
Check if dew forms in
the Freezer.
Replace the
Components of
defrosting circuit.
Check Refrigerating
Cycle.
Check the
Thermistor
Defrosting
is poor.
The cycle
is faulty. Repair the cycle.
Replace the
Thermistor.
The operation of
the Thermistor is
poor.

6-5 REFRIGERATING CYCLE
- 14 -
▼Troubleshooting Chart
▼Leakage Detection
● Observe discharging point of refrigerant which may be in the oil discharging part in the compressor and hole of evaporator.
YES
YES
Whether Compressor
runs or not.
Whether frost
forms or not in
Evaporator.
Observe the discharged
amount of Refrigerant.
Inject Refrigerant to Compressor
and check cooling operation.
Clogged by dust. Gas leakage.
Faulty
Compressor.
Moisture Clog.
Whether oil
leaks or not.
Frost formed normally
Normal amount
No or much amount
(Check the leakage point)
Frost formed normally
No frost
or forms
in inlet only
Check Compressor
PARTIAL Freezer room and Low flowing sound of A little high • Refrigerant level is low due
LEAKAGE Refrigerator Refrigerant is heard and more than • to a leak.
don't cool frost forms in inlet only ambient • Normal cooling is possible
normally. temperature. • when injecting of Refrigerant
• the regular amount.
WHOLE Freezer room and Flowing sound of Refrigerant Equal to ambient • No discharging of Refrigerant.
LEAKAGE Refrigerator is not heard and frost isn't temperature. • Normal cooling is possible
don't cool formed. • when injecting of Refrigerant
normally. • the regular amount.
PARTIAL Freeze room and Flowing sound of Refrigerant A little high • Normal discharging of
CLOG Refrigerator is heard and frost forms more than • refrigerant.
don't cool in inlet only. ambient • The capillary tube is faulty.
normally. temperature.
WHOLE Freezer room and Flowing sound of Refrigerant Equal to ambient • Normal discharging of
CLOG Refrigerator is not heard and frost isn't temperature. • Refrigerant.
don't cool. formed.
MOISTURE Cooling operation Flowing sound of Refrigerant Low than • Cooling operation restarts
CLOG stops periodically. is not heard and frost melts. ambient • when heating the inlet of
temperature • capillary tube.
COMP- Freezer and Low flowing sound of A little high • Low pressure at high side
RESSION Refrigerator Refrigerant is heard and than ambient • of compressor due to low
don't cool. frost forms in inlet only. temperature. • refrigerant level.
NO COMP- No compressing Flowing sound of Refrigerant Equal to ambient • No pressure of high pressure
RESSION operation. is not heard and no frost. temperature. • part in the compressor.
CAUSE TEMPERATURE
OF THE
COMPRESSOR REMARKS
STATE OF
THE SET STATE OF THE EVAPORATOR
LEAKAGE
CLOGGED BY DUST
DEFECTIVE
COMPRESSION

- 15 -
NO. ITEMS UNIT STANDARDS PURPOSES REMARKS
▼General Control of Refrigerating Cycle
Pipe and
piping system
opening time
Welding
N2sealed
parts
Refrige-
ration
Cycle
Refrigerant
weighing
Drier
replacement
Leak check
1
2
3
4
5
6
7
Min.
Nitrogen
pressure
Confirm
N2leak
Min.
Torr
EA
EA
EA
EA
Pipe: within 1 hour.
Comp: within 10 minutes.
Drier: within 20 minutes.
Weld under Nitrogen
atmosphere.
(N2pressure:
0.1~0.2 kg/cm2)
Confirm air leaking sounds
when removing rubber cap.
Sound: usable
No sound: not usable
More than 40 minutes
Below 0.03 (ref)
High and low pressure sides
are evacuated at the same
time for models above 200 l.
Use R-134a exclusive
manifold.
Use R-134a exclusive.
R-134a exclusive.
R-134a exclusive.
Use R-134a exclusively.
Weighing allowance: ±5g
Note: Winter: -5g
Summer: +5g
- Use R-134a exclusively for
R-134a refrigerator.
- Use R-12 exclusively for
R-12 refrigerator.
-
Replace drier whenever repairing
refrigerator cycle piping.
- Do not use soapy water for
check. It may be sucked
into the pipe by vacuum.
To protect
moisture
penetration.
To protect oxide
scale formation.
To protect
moisture
penetration.
To remove moisture.
To protect mixing
of mineral and
ester oils.
To protect R-12
refrigerant mixing.
"
"
Do not mix with
R-12 refrigerant.
To remove the
moisture from
pipe inside.
Defect
refrigerant leak
area.
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).
- 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 force to pipes before and
after welding to protect pipe from cracking.
- In case of evaporator parts, if it
doesn't make sound when removing
rubber cap, blow dry air or N2gas for
more than 1 min and use the parts.
Note: Onlu applicable to the model
equipped with reverse flow
protect plate.
Vacuum efficiency can be improved
by operating compressor during
evacuation.
The rubber pipes for R-12 refrigerant
shall be melted when they are used for
R-134a refrigerant (causes of leak).
- Do not weigh the refrigerant at too
hot or too cold an area.
(77°F[25°C] is adequate.)
- Make Copper bombe
Socket: 2SV Plug: 2PV R-134a
Note: Do not burn O-ring (rubber)
during welding.
- Check oil leak at refrigerant leak
area. Use electronic leak detector if
oil leak is not found.
- The electronic leak detector is very
sensitive to halogen gas in the air. It
also can detect R-141b in urethane.
Please practice, therefore, many
times before use.
Evacuation
time
Vacuum
degree
Vacuum
Vacuum
piping
Pipe
coupler
Outlet
(Socket)
Plug

8. EXPLODED VIEW & REPLACEMENT PARTS LIST
- 16 -
▼The parts of refrigerator and the shape of each part are subject to change in different localities.
▼Capacitors and fuse are optional parts.
GR-T622, GR-T722
*: Option
106A
104A
106A
401A
304A
103C
309A
318A
308A
314A 307A
312A
317A
310A
103A
105A
301A
283B
282B
406B
103B
411A
327A
328A
334B
323B
334A
315B
315A 315B
319A
329C
420A
319C
113D
113B
113C
410G
110A
158A*
408A*
409B*
410C
120B
409B
120C
158C
120A
406A*
158B*
145B
145A
282H*
282E*
282C
418A
281A
281B
282J

- 17 -
154A
151A
151C
151D
151B
170A
241C
241A
241D
241C
241C
241B
205A
205A
243A
210A
233A
230A
203A
200A
201A
231A
244B
244A
149A*
149A*
125C
330B 405C
405A
404A
329A
332A 281E*
212C
212A
212G
110C
125A
244E*
212C
281E*
140B
140C 140A*
146A*
141B
141C
141A*
140D
140E
140B
140A*
141D
141E
141B
141A*
151C
151D
*: Option

P/No. 3828JD8291A MAY, 2000 Printed in Korea