Refrigeration Cycle; Troubleshooting Chart; Leakage Detection - LG LRBN22514WW Service Manual

6-5 REFRIGERATION CYCLE

Troubleshooting Chart

STATE OF
CAUSE
THE UNIT
PARTIAL Freezer
LEAKAGE compartment and
Refrigerator don't
cool normally.
COMPLETE Freezer
LEAKAGE compartment and
Refrigerator don't
cool normally.
PARTIAL Freezer
CLOG compartment and
Refrigerator don't
cool normally.
WHOLE Freezer
CLOG compartment and
Refrigerator don't cool. formed.
MOISTURE Cooling operation
CLOG stops periodically.
COMP- Freezer and
RESSION Refrigerator
don't cool.
NO COMP- No compressing
RESSION operation.

Leakage Detection

Observe the discharging point of the refrigerant, which may be in the oil discharging part of the compressor and in a hole
in the evaporator.
Check if compressor
runs.
Frost formed normally
Faulty
Moisture Clog
Compressor.
Check Compressor
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
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 there is
no frost.
Check if frost
YES
forms in
Evaporator.
Normal amount
Inject refrigerant in compressor
and check cooling operation.
Clogged by dust.
- 15 -
TEMPERATURE
OF THE
COMPRESSOR
A little higher • Refrigerant level is low due
than ambient • to a leak.
temperature. • Normal cooling is possible by
• restoring the normal amount of
•refrigerant and repairing the leak.
Equal to ambient • No discharging of Refrigerant.
temperature. • Normal cooling is possible by
• restoring the normal amount of
• refrigerant and repairing the leak.
A little higher • Normal discharging of the
than ambient • refrigerant.
temperature. • The capillary tube is faulty.
Equal to ambient • Normal discharging of the
temperature. • Refrigerant.
Lower than • Cooling operation restarts
ambient • when heating the inlet of the
temperature. • capillary tube.
A little higher • Low pressure at high side
ambient • of compressor due to low
temperature. • refrigerant level.
Equal to ambient • No pressure in the high
temperature. • pressure part of the
• compressor.
Check if oil
leaks.
No frost
or frost forms
in inlet only
Observe the discharged
amount of Refrigerant.
None or too much
Frost formed normally
REMARKS
YES
Gas leakage.
(Find the leak and repair it)