Practical Work For Heavy Repair - Kenmore STEP UP Service Manual

10. Cooling Cycle Heavy Repair

10-3. Practical Work for Heavy Repair

Items
1. Removal of
residual refrigerant
2. Nitrogen
blowing
welding
To avoid risk of electrical shock that can cause death or severe personal injury,
WARNING
!
disconnect unit from power before servicing unless tests require power.
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 (0.1~0.2kg/cm2) to high 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
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