Kenmore 111.6121 Series Service Manual page 54

12. Cooling Cycle Heavy repair
12-3. Practical Work for Heavy Repair
Items
1. Removal of
residual refrigerant
2. Nitrogen
blowing welding
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 (dryer part) with a nipper and then cut low pressure side.
- When replacing a dryer:
Weld ①and② parts by blowing nitrogen (40 kg-f/cm
pressure side after assembling a dryer.
- When replacing a compressor:
Weld ③and④ 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.
※ KEYPOINTING
Welding without nitrogen blowing produces oxidized scales inside
a pipe, Which affect on performance and reliability of a product
Precautions
54
.↑) to high
2