LG LSSB2791ST Service Manual page 28

TROUBLE DIAGNOSIS
1-6. Brazing Reference Drawings
Compressor
Copper Brazing
Copper Brazing
1-7.
3-Way Valve Service
■ Since 3-way valve controls refrigerant with an inner plastic
damper, defect may occur because the plastic damper is
deteriorated and welding heat is delivered to a pipe during
welding for repair and replacement of the valve welding
part.
So perform service in following service method.
1) Replace 3-way valve assembly where refrigerant leakage
occurs at the joint pipe (ⓐ, ⓑ, ⓒ part) connected with the
service valve of valve welding part.
(For unavoidable welding, wrap the body part of valve with
a water towel so that delivery of welding heat is minimized
100 °C or less.
2) Service in replacement of valve (valve failure.) Perform
service in the same method as above.
3) Other cautions.
(1) Pipe for capillary tube should be welded through insertion by 20+3-3mm. (For preventing clogging during welding)
(2) Take care since inner ejecting objects may be damaged if falling a valve or giving a strong shock.(Poor operation and
leakage quantity may be increased due to damage of inner parts.)
(3) Entirely remove and check ice formation which occurred in the Evaporator before or after improvement work for
non-insertion of 3-way valve housing, defect or shortage of goods, defective welding.
Copper Brazing
Drain Pipe
Condenser
Silver Brazing
Coppper Brazing
Body
Freezer
28
Evaporator
Evaporator
Hot Line
Drier
Copper
Brazing
Dryer side
Refrigerator
(Sky blue colored
Copper Brazing
3 way valve
Hishi-Tube.)