LG GR-S512QVC Service Manual ▷ View online
6-5 REFRIGERATING CYCLE
- 14 -
▼
Troubleshooting Chart
▼
Leakage Detection
Observe discharging point of refrigerant which may be in oil discharging part in compressor and hole of evaporator.
YES
YES
Whether Compressor
runs or not.
runs or not.
Whether frost
forms or not in
Evaporator.
forms or not in
Evaporator.
Observe the discharging
amount of Refrigerant.
amount of Refrigerant.
Inject Refrigerant to
Compressor and check
cooling operation.
Compressor and check
cooling operation.
Clogged by dust.
Gas leakage.
Faulty
Compressor.
Compressor.
Moisture Clog.
Whether oil leaks
or not.
or not.
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
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 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 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
COMPRESSION
- 15 -
NO.
ITEMS
CONTENTS AND SPECIFICATIONS
REMARKS
WELDING
(1) H 30
ROD
(1)
• Chemical Ingredients
• Recommend H34 containing 34% Ag in the
(1) •
Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20%
•
Service Center.
(1)
• Brazing Temperature: 710~840°C
(2) Bcup-2
(1)
• Chemical Ingredients
(1) •
Cu: About 93%
(1) •
P: 6.8~7.5%
(1) •
The rest: within 0.2%
(1)
• Brazing Temperature: 735~840°C
FLUX
(1)
• Ingredients and how to make
• Make amount for only a day.
( 1 )
(1) ••
Borax 30%
•
Holding period: 1 day
(1) ••
Borax 35%
• Close the cover of container to prevent dust
(1) •
Fluoridation kalium: 35%
•
putting in the FLUX.
(1) •
Water: 4%
• Keep it in a stainless steel container.
(1) •
Mix the above ingredients and boil until
(1) •
they are transformed into liquid.
DRIER
(1) Assemble the drier within 30min.
• Don't keep the drier in a outdoor because
ASM
(1)
after unpacking.
•
humidity damages to it.
(2) Keep the unpacked drier at the temperature
of 80~100°C.
VACUUM
(1) When measuring with pirant Vacuum
• Apply M/C Vacuum Gauge without fail.
(1 )
gauge of charging M/C, vacuum
• Perform vacuum operation until a proper
(1 )
degree is within 1 Torr.
•
vacuum degree is built up.
(2) If the vacuum degree of the cycle inside is
• If a proper vacuum degree isn't built up,
•
(2)
10 Torr. below for low pressure and 20 Torr.
•
check the leakage from
(2)
for high pressure, it says no vacuum
•
the Cycle Pipe line part and
(2)
leakage state.
•
Quick Coupler Connecting part.
(3) Vacuum degree of vacuum pump must be
(3)
0.05 Torr. below after 5 min.
(4) Vacuum degree must be same to the
value described item (2) above for more than
20 min.
20 min.
(1) The pressure of dry air must be more
than 12~16Kg/cm
2
(2) Temperature must be more than
-20~-70°C.
(3) Keep the pressure to 12~6Kg/cm
2
also
(3)
when substituting dry air for Nitrogen Gas.
NIPPLE
(1) Check if gas leaks with soapy water.
• Check if gas leaks from connecting part of
AND
(2) Replace Quick Coupler in case of leakage.
•
Coupler.
COUPLER
PIPE
(1)
• Put all Joint Pipe in a clean box and
(1)•
cover tightly with the lid so that dust or
(1)•
humidity is not inserted.
1
2
3
4
5
6
7
DRY AND
AIR
NITROGEN
GAS
AIR
NITROGEN
GAS
▼
General Control of Refrigerating Cycle
The following description is basically for GR-S462/GR-S512. For the other models, refer to the diagram of the entire PCB
circuit.
circuit.
7-1 FUNCTION
7-1-1 FUNCTION
1. When the appliance is plugged in, it is set to ‘Medium’. Each time the button is pushed, it is set to
‘Medium’
→
‘Medium/High’
→
‘High’
→
‘Low’
→
‘Medium/Low’
→
‘Medium’ in order.
2. When the power is initially applied or restored after a power failure, it is automatically set to ‘Medium’.
7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM
- 16 -
Temp
Control
Control
Medium/
Medium/
Low
Low
Medium
High
High
TEMP(˚C)
7
4
2
0
-2
ROOM
REFRIGERATOR
7-1-2 DEFROSTING
1. The defrosting is performed each time when the total running time of the compressor reaches 7 hours.
2. After the power is turned on (or restored after a power failure), the defrosting starts when the total running time of the
compressor reaches 4 hours.
3. When the temperature of the defrosting sensor reaches 10 °C or above, the defrosting stops. If the temperature does not
reach 10 °C in 2 hours after the defrosting starts, the defrosting error code is displayed.
(Refer to 7-1-5 Error Diagnostic Mode.)
(Refer to 7-1-5 Error Diagnostic Mode.)
4. With the defective defrosting sensor (cut or short-circuited wire), the defrosting will not be performed.
7-1-3 SEQUENTIAL OPERATION OF ELECTRIC COMPONENTS
The electric components, such as the comp, defrosting heater, and cooling fan, start sequentially to avoid the noise and
damage to the part, which may result from the simultaneous start of various components on turning the power on or after
the completion of a test.
damage to the part, which may result from the simultaneous start of various components on turning the power on or after
the completion of a test.
7-1-4 CONTROL OF DOUBLE COOLING FAN IN THE REFRIGERATOR COMPARTMENT.
1. To raise the refrigerating speed, Fan Motor in the Refrigerator Compartment is operated when the door of freezer room or
refrigerator room is opened and then closed.
2. The Fan Motor is stoped after 20 sec. when the door is closed.
Condition of Operation
Operating Sequence
If the temp of the defrosting
sensor is 45 °C or above
(For the initial use after the
purchase or grounding)
sensor is 45 °C or above
(For the initial use after the
purchase or grounding)
If the temp of the defrosting
sensor is below 45 °C
(After a power failure or SVC)
sensor is below 45 °C
(After a power failure or SVC)
- 17 -
POWER
in 0.5 sec
COMP & COOLING FAN
ON
ON
POWER
in 0.5 sec
DEFROSTING
in 10 sec
DEFROSTING
ON
HEATER ON
HEATER OFF
in 0.5 sec
COMP & COOLING FAN
ON
When the power is turned on
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