Refrigerating Cycle - LG GR-642AVP Service Manual

6-5 REFRIGERATING CYCLE

Troubleshooting Chart
STATE OF
CAUSE
THE SET
PARTIAL Freezer and
LEAKAGE Refrigerator
don't get cold
normally.
WHOLE Freezer and
LEAKAGE Refrigerator
don't get cold
at all.
PARTIAL Freeze room and
CLOG Refrigerator
don't get cold
normally.
WHOLE Freezer and
CLOG Refrigerator
don't get cold.
MOISTURE Cooling operation
CLOG stops periodically.
COMP- Freezer and
RESSION Refrigerator
don't get cold.
NO COMP- No compressing
RESSION operation.
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.
Normal formed frost
Moisture Clog.
STATE OF THE
EVAPORATOR
Low flowing sound of
Refrigerant is heard and
frost forms in inlet only
Flowing sound of Refrigerant
is not heard and frost isn't
formed.
Flowing sound of Refrigerant
is heard and frost forms
in inlet only.
Flowing sound of Refrigerant
is not heard and frost isn't
formed.
Flowing sound of Refrigerant
is not heard and frost melts.
Low flowing sound of
Refrigerant is heard and
frost forms in inlet only.
Flowing sound of Refrigerant
is not heard and no frost.
Whether frost
forms or not in
YES
Evaporator.
Normal amount
Faulty
Compressor.
Check Comprossor
TEMPERATURE
OF THE
COMPRESSOR
A little high
more than
ambient
temperature.
Equal to ambient
temperature.
A little high
more than
ambient
temperature.
Equal to ambient
temperature.
Low than
ambient
temperature
A little high
than ambient
temperature.
Equal to ambient
temperature.
No frost or forms
in inlet only
Inject Refrigerant to
Compressor and check
cooling operation.
Clogged by dust.
Normal formed
frost in Evaporator
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REMARKS
• A little Refrigerant
• discharges.
• Normal cooling is possible
• when injecting Refrigerant
• of regular amount.
• No discharging of Refrigerant.
• Normal cooling is possible
• when injecting Refrigerant
• of regular amount.
• Normal discharging of
• refrigerant.
• The capillary tube is faulty.
• Normal discharging of
• Refrigerant.
• Cooling operation restarts
• when heating the inlet of
• capillary tube.
• The pressure of high
• pressure part in
• compressor is low.
• No pressure of high pressure
• part in compressor.
Whether oil leaks
or not.
Observe the discharging
amount of Refrigerant.
No or much amount
Gas leakage.
(Check the leakage point)
YES