LG Electronics GR-P227/L227 Cooling Cycle Heavy Repair, Trouble Diagnosis, Items, Unit, Standards

TROUBLE DIAGNOSIS

3. Cooling Cycle Heavy Repair

3-1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant

NO.	Items		Unit	Standards	Purposes	Remarks
1	Pipe and piping		Min.	Pipe:within 1 hour.	To protect	The opening time should be reduced to a
	system opening time.			Comp:within	Moisture	half of the standards during rain and
				10 minutes.	Penetration.	rainy seasons (the penetration of water
				Drier:within		into the pipe is dangerous).
				20 minutes.
2	Welding.		Nitrogen	Weld under	To protect	- Refet to repair note in each part.
			Pressure.	Nitrogen	oxide scale	- R134a refrigerant is more susceptible to
				atmosphere	formation.	leaks than R12 and requires more care
				(N2 pressure:		during welding.
				0.1~0.2 kg/cm2)		- Do not apply force to pipes before and
						after welding to protect pipe from
						cracking.
3	N2 sealed parts.		Confirm N2	Confirm air leaking	To protect	- In case of evaporator parts, if it doesn't
			leak.	sounds when	moisture	noise when removing rubber cap blow
				removing rubber	penetration.	dry air or N2 gas for more than 1 min
				cap.		use the parts.
				Sound:usable
				No sound:not usable
4	Refrigeration	Evacuation	Min.	More than	To remove
	Cycle.	time		40 minutes.	moisture.
		Vacuum	Torr	Below 0.03(ref)		Note:Only applicable to the model
		degree				equipped with reverse flow protect
						plate.
		Vacuum	EA	High and low		Vaccum efficiency can be improved by
				Pressure sides are		operating compressor during evacuation.
				evacuated at the
				same time for
				models above 200L
		Vacuum	EA	Use R134a	To protect	The rubber pipes for R12 refrigerant shall
		piping		exclusive	mixing of	be melted when they are used for R134a
				manifold.	mineral and	refrigerant(causes of leak).
					ester oils.
		Pipe	EA	Use R134a	To protect
		coupler		cxclusive.	R12 Refri-
					gerant mixing.
		Outlet		R134a exclusive.
		(Socket)
		Plug		R134a exclusive
5	Refrigerant weighing.		EA	Use R134a	Do not mix	- Do not weight the refrigerant at too hot or
				exclusively.	with R12	too cold an area.(25°C is adequate.)
				Weighing	refrigerant.	- Use copper bombe
				allowance:±5g		Socket:2SV Plug: 2PV R134a
				Note:Winter:-5g		Note:Do not burn O-ring (rubber) during
				Summer:+5g		welding.
6	Drier replacement.			-Use R134a exclusively	To remove
				for R134a refrigerator	the moisture
				-Use R12 exclusively	from pipe.
				for R12 refrigerator
				-Replace drier whenever
				repairing refrigerator
				cycle piping.
7	Leak check.			-Do not use soapy	Detect	-Check oil leak at refrigerant leak area.
				water for check.	refrigerant	Use electronic leak detector if oil leak is
				it may be sucked	leak area.	not found.
				into the pipe by.		-The electronic leak detector is very
						sensitive to halogen gas in the air. It also
						can detect R141b in urethane. Please
						practice, therfore, many times before use.

NOTE) Please contact Songso company on +82-53-554-2067 if you have inquiry on heavy repair special facility.

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