LG GR-122SJ Service Manual ▷ View online
ANOTHER ELECTRIC COMPONENTS
▼
Cooling is impossible
- 12 -
Compressor
doesn't run.
doesn't run.
Running state of
Compressor is poor.
Compressor is poor.
Check a starting voltage.
Check if current flows to the
following components.
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.
the Compressor.
Replace
each component.
each component.
Raise the voltage.
Replace
each component.
each component.
Cause
Check if current flows to
starting devices.
starting devices.
Check current flowing in
sub-coil of Compressor.
sub-coil of Compressor.
Check capacity of OLP.
The items described
above are normal.
above are normal.
▼
Cooling ability is poor
Fan motor
doesn't run.
doesn't run.
Much frost are
sticked to the cooler.
sticked to the cooler.
Poor contacting.
Coil is shorted.
Shorted.
Replace
each component.
each component.
Replace
each component.
each component.
Replace
each component.
each component.
Running is poor.
(Coil is shorted.)
(Coil is shorted.)
Check current flowing
in door switch.
in door switch.
Check current flowing
in the Fan Motor.
in the Fan Motor.
Check the running
condition of Timer.
condition of Timer.
• Defrost Thermostat
• Fuse-M
• Fuse-M
• L-cord
• TE-Plate Heater
• TE-Plate Heater
Check current flowing of
the following components.
the following components.
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 setted 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 putting in hot foods.
• Put in foods after they get cold.
• 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 Thermostat is set to WARM.
• Set the knob to MID.
Foods in the
• Are foods placed in cooling air outlet?
• Place foods in high temperature section.
refrigerator
•
(Front Part)
are frozen.
• Check if the Thermostat is set to COLD.
• Set the knob to MID.
• Is the ambient temperature within 5°C?
• Set the knob to WARM.
Dew or ice
• Is watery foods kept?
• Seal up watery foods with wrap.
forms in the
• Check if putting in hot foods.
• Put in foods after they get cold.
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 happening
in the out case.
•
are high.
•
is solved in low temperature and humidity
•
naturally.
• Is the gap in the door packing?
• Fill up the gap.
Abnormal
• Is the set positioned in a firm and even place?
• Adjust the Adjust screw, and position
noise generates.
•
in the firm place.
• Does any unnecessary objects exist
• Remove the objects.
•
in the back side of the set?
• Check if the Drip Tray is omitted.
• Place it on an original position.
• Check if the cover of mechanical from
• Place the cover at an original position.
•
in below and front side is taken out.
To close the door
• Check if the door packing becomes dirty
• Clean the door packing.
is not handy.
•
by filth such as juice.
• Is the set positioned in a firm and even place?
• Position in the firm place and adjust the
•
Adjust screw.
• Are too much foods putted in the set?
• Keep foods not to reach to the door.
Ice and foods
• Check if the inside of the set becomes dirty.
• Clean the inside of the set.
smell unpleasant.
• Did you keep smelly foods without wraping?
• Wrap smelly foods.
• It smells plastic.
• The new products smell plastic, but it is
•
removed after 1-2 weeks.
REFRIGERATING CYCLE
▼
Troubleshooting Chart
- 14 -
▼
Leakage Detection
Observe discharging point of refrigerant which may be in oil discharging part in Compressor and hole of Evaporator.
Whether Compressor
runs or not.
runs or not.
Whether frost forms
or not in Evaporator.
or not in Evaporator.
Observe the discharging
amount of refrigerant.
amount of refrigerant.
Inject refrigerant to Compressor
and check cooling operation.
and check cooling operation.
Clogged by dust.
Gas leakage.
Faulty
Compressor.
Compressor.
Moisture
Clog.
Clog.
Whether oil leaks or not.
YES
YES
Normal formed frost
Normal amount
No or much amount
(Check the leakage point)
Normal formed
frost in Evaporator
frost in Evaporator
No frost
or forms
in inlet only
or forms
in inlet only
Check Comprossor
Partial
Freezer and
Low flowing sound of
A little high
• A little refrigerant
Leakage
refrigerator
refrigerant is heard and
more than
•
discharges.
don't get cold
frost forms in inlet only.
ambient
• Normal cooling is possible
normally.
temperature.
•
when injecting refrigerant
•
of regular amount.
Whole
Freezer 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 get cold
formed.
•
when injecting refrigerant
at all.
•
of 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 get cold
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 get cold.
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 room and
Low flowing sound of
A little high
• The pressure of high
RESSION
refrigerator
refrigerant is heard and
than ambient
•
pressure part in
don't get cold.
frost forms in inlet only.
temperature.
•
compressor is low.
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 compressor.
CAUSE
TEMPERATURE
OF THE
COMPRESSOR
REMARKS
STATE OF
THE SET
STATE OF THE
EVAPORATOR
LEAKAGE
CLOGGED
BY
DUST
DEFECTIVE
COMPRESSOR
▼
General Control of Refrigerating Cycle
- 15 -
NO.
ITEMS
UNIT
STANDARDS
PURPOSES
REMARKS
Pipe and
piping system
opening time
piping system
opening time
Welding
N
2
sealed
parts
Refrige-
ration
Cycle
ration
Cycle
Refrigerant
weighing
weighing
Drier
replacement
replacement
Leak check
1
2
3
4
5
6
7
Min.
Nitrogen
pressure
pressure
Confirm
N
N
2
leak
Min.
Torr
EA
EA
EA
EA
Pipe: within 1 hour.
Comp: within 10 minutes.
Drier: within 20 minutes.
Comp: within 10 minutes.
Drier: within 20 minutes.
Weld under Nitrogen
atmosphere.
(N
atmosphere.
(N
2
pressure:
0.1~0.2 kg/cm
2
)
Confirm air leaking sounds
when removing rubber cap.
Sound: usable
No sound: not usable
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
are evacuated at the same
time for models above 200
l
.
Use R-134a exclusive
manifold.
manifold.
Use R-134a exclusive.
R-134a exclusive.
R-134a exclusive.
Use R-134a exclusively.
Weighing allowance:
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.
into the pipe by vacuum.
To protect
moisture
penetration.
moisture
penetration.
To protect oxide
scale formation.
scale formation.
To protect
moisture
penetration.
moisture
penetration.
To remove moisture.
To protect mixing
of mineral and
ester oils.
of mineral and
ester oils.
To protect R-12
refrigerant mixing.
refrigerant mixing.
"
"
Do not mix with
R-12 refrigerant.
R-12 refrigerant.
To remove the
moisture from
pipe inside.
moisture from
pipe inside.
Defect
refrigerant leak
area.
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).
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
- R-134a refrigerant is more
susceptible to leaks than R-12 and
requires more care during welding.
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 N
rubber cap, blow dry air or N
2
gas for
more than 1 min and use the parts.
Note: Onlu applicable to the model
equipped with reverse flow
protect plate.
protect plate.
Vacuum efficiency can be improved
by operating compressor during
evacuation.
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).
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.)
(77°F[25°C] is adequate.)
- Make Copper bombe
Socket: 2SV Plug: 2PV R-134a
Note: Do not burn O-ring (rubber)
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.
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.
also can detect R-141b in urethane.
Please practice, therefore, many
times before use.
Evacuation
time
time
Vacuum
degree
degree
Vacuum
Vacuum
piping
piping
Pipe
coupler
coupler
Outlet
(Socket)
(Socket)
Plug
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