LG Electronics GR-P257/L257 Practical Work For Heavy Repair, Trouble Diagnosis, Items

TROUBLE DIAGNOSIS

3-4. Practical Work For Heavy Repair

Items		Precautions
1. Removal of residual		Evaporator
refrigerant.	Low pressure side
			KEYPOINTING
Compressor			Observe the sequence for
			removal of refrigerant.
		Drier
	Suction		(If not, compressor oil may
		High pressure side	leak.)
Refrigent	Release
		Condenser
Intake

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.

2. Nitrogen blowing
welding.				Evaporator
					KEYPOINTING
					Welding without nitrogen
		1	2	1	blowing produces oxidized
					scales inside a pipe, which
				Drier
					affect on performance and
			High pressure side		reliability of a product.
Refrigent		2	Condenser
Intake
When replacing a drier:
Weld	and	parts by blowing nitrogen(0.1~0.2kg/cm2) to high pressure side after
assembling a drier.
When replacing a compressor:
Weld	and	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.

3. Replacement of drier.

		* Unit : mm
			KEYPOINTING
			Be sure to check the
			inserted length of capillary
			tube when it is inserted. (If
	+3		too much inserted, a
	12-0		capillary tube is clogged by
			a filter.)
Filter

Inserting a capillary tube

Measure distance with a ruler and put a mark(12+3/-0)on the capillary tube. Insert tube to the

mark, and weld it

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