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TROUBLE DIAGNOSIS
3-4. Practical Work For Heavy Repair
Precautions
Items
1. Removal of residual
refrigerant.
2. Nitrogen blowing
welding.
3. Replacement of drier.
Evaporator
Low pressure side
Compressor
/
_:_/
_'_
^
,J
_
Drier
I
_ide
R_enser
H._. r-........
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.
®
Condenser
Intake
Evaporator
KEYPOINTING
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 nitrogen(0, l~0.2kg/cm2) to high pressure side after
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 oxidizec
scales inside
pipe becausa of its short welding time.
* Unit : mm
Filter
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.)
Inserting a capillary tube
Measure distance with a ruler and put a mark(12*3_s0)On the capillary tube. Insert tube to the
mark, and weld it
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