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TROUBLE DIAGNOSIS
3-4. Practical Work For Heavy Repair
Items
1. Removal of residual
refrigerant.
2. Nitrogen blowing
welding.
3. Replacement of drier.
Low pressure side
Compressor
Suction
Release
Condenser
Refrigent
Intake
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.
1
Condenser
Refrigent
2
Intake
When replacing a drier:
Weld
and
parts by blowing nitrogen(0.1~0.2kg/cm
assembling a drier.
When replacing a compressor:
Weld
and
parts by blowing nitrogen to the low pressure side.
Note) For other parts, nitrogen blowing is not necessary because it does not produce oxidized
scales inside pipe because of its short welding time.
Filter
Inserting a capillary tube
Measure distance with a ruler and put a mark(12
mark, and weld it
Precautions
Evaporator
Drier
High pressure side
Evaporator
2
1
Drier
High pressure side
2
) to high pressure side after
* Unit : mm
+
3
12
-
0
+3/-0
)on the capillary tube. Insert tube to the
- 75 -
KEYPOINTING
Observe the sequence for
removal of refrigerant.
(If not, compressor oil may
leak.)
KEYPOINTING
Welding without nitrogen
blowing produces oxidized
scales inside a pipe, which
affect on performance and
reliability of a product.
KEYPOINTING
Be sure to check the
inserted length of capillary
tube when it is inserted. (If
too much inserted, a
capillary tube is clogged by
a filter.)
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