Daewoo FRU-541 Series - Cooling Cycle Repair: Vacuum and Refrigerant Charging; Vacuum Degassing and Refrigerant Charging Procedures

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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.

PrecautionsItems

* 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

ressure

Suction

Discharge tube

Condense

Hot