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3-3. Practical Work For Heavy Repair
Items
1. Removal of residual
refrigerant.
2. Nitrogen blowing
welding.
3. Replacement of drier.
Suction
Service tube
Discharge tube
1) Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator off.
2) Install a piercing type valve on the high pressure line (drier side). Then use the appropriate
recovery equipment to recover the refrigerant from the system. When the refrigerant has
been recovered, install a piercing type valve on the low pressure side. IT IS IMPORTANT
TO OPEN THE SYSTEM IN THIS ORDER TO KEEP THE OIL FROM BEING FORCED OUT .
The use of piercing type valves will allow future servicing and eliminates the possibility of a
defective pinch off.
Suction
4
3
Service tube
Discharge tube
After to be assembled drier (weld
pressure side (0.1~0.2 Kg/cm²)
3
Weld
and
4
parts and apply blowing nitrogen to the low pressure side.
Inserting a capillary tube
Measure distance with a ruler and put a mark(
mark and weld it
Precautions
Capillary
Tube
Capillary
Tube
2
1
and
parts) apply nitrogen to high
1
2
0.748
±
0.04
)on the capillary tube. Insert tube to the
0.748
±
0.04
104
KEY POINT
Observe the sequence for
removal of refrigerant.
(If not, compressor oil may
leak.)
KEY POINT
Welding without nitrogen
blowing produces oxidized
scales inside a pipe, which
affect performance and
reliability of a product.
KEY POINT
Be sure to check the
inserted length of capillary
tube when it is inserted.
(If inserted too far, the
capillary tube will be
blocked by the filter.)
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