Refrigerating Cycle - LG LTCS20020 Series Service Manual

7-5 REFRIGERATING CYCLE

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
Refrigerant is heard and
formed.
is heard and frost forms
in inlet only.
is not heard and frost isn't
formed.
is not heard and frost melts.
refrigerant is heard and
frost forms in inlet only.
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
than ambient
than ambient
temperature.
ambient
temperature.
ambient
temperature.
temperature.
No frost or frost forms
in inlet only
Normal Amount
None or too much.
Faulty
Compressor
(check correct quantity)
No frost
Replace
normally
Compressor
Restriction
26
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REMARKS
to a leak.
restoring the normal amount of
restoring the normal amount of
refrigerant and repairing the leak.
refrigerant.
refrigerant.
when heating the inlet of the
capillary tube.
of compressor due to low
refrigerant level.
pressure part of the
compressor.
Check for oil leak on high
side (Machinery Room)
YES
Gas leakage
Confirm refrigerant
amount
Recharge refrigerant
Repair it.
Frost formed
Frost formed
normally
normally
Finished OK