LG GR-L247ER Parts List And Instructions Manual page 73

TROUBLE DIAGNOSIS
3-4. Practical Work For Heavy Repair
Precautions
items
1. Removal of residual
refrigerant.
2. Nitrogenblowing
welding.
3. Replacement of drier,
Evaporator
Low pressure side
Compressor / _/
__ I High pressure side
R_denser "-_ _ .....
Intake
KEYPOINTING
Observe the sequence for
removal of refrigerant.
(If not, compressor oil may
leak,)
1) Remove residual refrigerant more than 5 minutes later after turning off the refrigerator.
( If not, compressor oil may leak inside.)
2) Remove retained refrigerant slowly by cutting first high pressure side (drier part) with a
nipper and then cut low pressure side.
Evaporator
_. _ _ I High pressure side
Re_igen_ -J (_) Condenser "
Intake
KI=YPOINTING
Welding without nitrogen
blowing produces oxidized
scales inside a pipe, which
affect on performance and
reliability of a product.
When replacing a drier:
Weld (]) and _) parts by blowing nitregen(0, l~0.2kg/cm 2) to high pressure side after
assembling adder.
When replacing a compressor:
Weld (D and (_) parts by blowing nitrogen to the low pressure side.
Note) For other parts, nitrogen blowing is not necessary because it does not produce oxidize
scales inside pipe because of its short welding time.
Filter
KEYPOINTING
Be sure to check the
inserted length of capillary
tube when it is inserted. (if
too much inserted, a
capillary tube is dogged by
a filter.)
Inserting a capillary tube
Measure distance with a ruler and put a mark(12*3_-0)oo the capillary tube, Insert tube to the
mark, and weld it
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