Refrigerating Cycle - LG LTCS24223D Service Manual

7-5 REFRIGERATING 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
RESTRICTION
compartment and
Refrigerator don't
cool normally.
WHOLE
Freezer
RESTRICTION
compartment and
Refrigerator don't cool.
MOISTURE
Cooling operation
RESTRICTION
stops periodically.
COMP-
Freezer and
RESSION
Refrigerator
don't cool.
NO COMP-
No compressing
RESSION
operation.
Leakage Detection
Check sealed system for leak.
Check if compressor runs.
(If don't , wait a while until it start to work)
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 there is
no frost.
YES
Check frost pattern on Evaporator.
(Eva In, Eva Out)
If frost is formed normally
Only check that there is not any
hole or bad welding in Eva in-Eva
out.
Moisture restriction.
intermittent problem.
TEMPERATURE
OF THE
COMPRESSOR
A little higher
than ambient
temperature.
Equal to ambient
temperature.
A little higher
than ambient
temperature.
Equal to ambient
temperature.
Lower than
ambient
temperature.
A little higher
ambient
temperature.
Equal to ambient
temperature.
No frost or frost forms
in inlet only
Normal Amount
None or too much.
Faulty
Compressor
No frost
Replace
normally
Compressor
Restriction
- 26 -
REMARKS
‡ Refrigerant level is low due
to a leak.
‡ Normal cooling is possible by
restoring the normal amount of
‡ Refrigerant and repairing the leak.
‡ No discharging of Refrigerant.
‡ Normal cooling is possible by
restoring the normal amount of
refrigerant and repairing the leak.
‡ Normal discharging of the
refrigerant.
‡ The capillary tube is faulty.
‡ Normal discharging of the
refrigerant.
‡ Cooling operation restarts
when heating the inlet of the
capillary tube.
‡ Low pressure at high side
of compressor due to low
refrigerant level.
‡ No pressure in the high
pressure part of the
compressor.
Check for oil leak on high
side (Machinery Room)
YES
Gas leakage
Confirm refrigerant
amount
Recharge refrigerant Repair it.
(check correct quantity)
Frost formed
Frost formed
normally
normally
Finished OK