Daewoo FPN-X22D3 Series, Service Manual

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3. Practical Work for Heavy Repair
COOLING CYCLE HEAVY REPAIR
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.
1. Removal of residual
refrigerant.
Precautions Items
Process
Compresso
Evaporato
Drye
High Pressure
Low
pressure
Suction
Discharge tube
Condense
Hot
Evaporato
* 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.
2. Nitrogen blowing
welding.
- KEYPOINTING
Welding without nitrogen blowing produces oxidized scales inside
a pipe, Which affect on performance and reliability of a product.
Process
Compresso
Evaporato
Drye
High Pressure
Low
pressure
③
Condense
④
①
②
Hot
50