LG LSC27914SB Owner's Manual - Page 124

Practical Work For Heavy Repair

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3-3. Practical Work For Heavy Repair Items Precautions 1. Removal of residual refrigerant. Suction Service tube Discharge tube Capillary Tube KEY POINT Observe the sequence for removal of refrigerant. (If not, compressor oil may leak.) 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. 2. Nitrogen blowing welding. Suction 4 Service tube 3 Discharge tube KEY POINT Welding without nitrogen blowing produces oxidized scales inside a pipe, which Capillary affect performance and 2 Tube reliability of a product. 1 After to be assembled drier (weld 1 and 2 parts) apply nitrogen to high pressure side (0.1~0.2 Kg/cm²) Weld 3 and 4 parts and apply blowing nitrogen to the low pressure side. 3. Replacement of drier. 0.748 ± 0.04 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.) Inserting a capillary tube Measure distance with a ruler and put a mark(0.748 ±0.04)on the capillary tube. Insert tube to the mark and weld it - 123 -

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3-3. Practical Work For Heavy Repair
- 123 -
Items
Precautions
1. Removal of residual
refrigerant.
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.
2. Nitrogen blowing
welding.
3. Replacement of drier.
Inserting a capillary tube
Measure distance with a ruler and put a mark(
)on the capillary tube.
Insert tube to the
mark and weld it
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.)
0.748
±
0.04
0.748
±
0.04
Service tube
Discharge tube
3
Suction
4
1
2
Capillary
Tube
Suction
Service tube
Discharge tube
Capillary
Tube
After to be assembled drier (weld
and
parts) apply nitrogen to high
pressure side (0.1~0.2 Kg/cm²)
3
4
1
2
Weld
and
parts and apply blowing nitrogen to the low pressure side.