Precaution During Heavy Repair - Daewoo FRN-U20IE series Service Manual

9-2. Precautions During Heavy Repair
Items
Use of tools.
Removal of retained
refrigerant.
Replacement of drier.
Nitrogen blowing
welding.
Others.
1) Use special parts and tools for R-134a or R-600a
1) Remove retained refrigerant more than 5 minutes after turning off
a refrigerator. (If not, oil will leak inside.)
2) Remove retained refrigerant by cutting first high pressure side
(drier part) with a nipper and then cut low pressure side.
(If the order is not observed, oil leak will happen.)
Suction tube
Compressor
Process tube
Discharge tube
1) Be sure to replace drier when repairing pipes
and injecting refrigerant.
1) Weld under nitrogen atmosphere in order to prevent oxidation
inside a pipe. (Nitrogen pressure : 0.1~0.2 kg/cm2.)
1) Nitrogen only should be used when cleaning inside of cycle pipes
inside and sealing.
2) Check leakage with an electronic leakage tester.
3) Be sure to use a pipe cutter when cutting pipes.
4) Be careful not the water let intrude into the inside of the cycle.
70
Precautions
Evaporator
Low pressure
side
Hot Pipe
High Pressure side
Condenser
Dryer