GE GCW200YAWC Series Service Manual page 48

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 (drier part) with a nipper and then cut low pressure side.
Suction
Compresso
Process
Discharge tube
③
Compresso
Process
④
* When replacing a drier:
Weld 1 and 2 parts by blowing nitrogen (0.1~0.2kg/cm2) to high
pressure side after assembling a drier.
* When replacing a compressor:
Weld 3 and 4 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.
47
COOLING CYCLE HEAVY REPAIR
Precautions
Evaporato
Low
pressure
Hot
High Pressure
Condense
Evaporato
Low
pressure
Hot
High Pressure
Condense
Drye
②
Drye
①