LG GR-267 Service Manual ▷ View online
TROUBLE DIAGNOSIS
- 63 -
CLAIMS.
CAUSES AND CHECK POINTS.
HOW TO CHECK
8. Faulty lamp
(freezer and
refrigerator
compartment).
compartment).
9. Faulty internal
voltage(short).
1) Lamp problem.
Filament blows out.
Glass is broken.
Glass is broken.
2) Bad lamp assembly.
Not inserted.
Loosened by vibration.
Loosened by vibration.
3) Bad lamp socket.
Disconnection.
Bad soldering.
Bad rivet contact.
Bad rivet contact.
Short.
Water penetration. Low water
level in tray.
Bad elasticity of contact.
Bad contact(corrosion).
Bad contact(corrosion).
4) Door switch.
Its own defect.
Refrigerator and freezer switch is reversed.
Travlel distance.
Bad connection.
Bad terminal contact.
P/U liquid leak..
Refrigerator and freezer switch is reversed.
Travlel distance.
Bad connection.
Bad terminal contact.
P/U liquid leak..
1) Lead wire is damaged.
Wire damage when assembling P.T.C. Cover.
Outlet burr in the bottom plate.
Pressed by cord heater. lead wire, evaporator pipe.
Outlet burr in the bottom plate.
Pressed by cord heater. lead wire, evaporator pipe.
2) Exposed terminal.
Compressor Compartment terminal. - Touching other
components.
Freezer compartment terminal. - Touching evaporator pipe.
3) Faulty parts.
Transformer.
Coil contacts cover.
Welded terminal parts contact cover.
Welded terminal parts contact cover.
Compressor.
Bad coil insulation.
Plate heater.
Melting fuse.
Melting fuse.
Sealing is broken.
Moisture penetration.
Cord heater.
Pipe damaged.
Moisture penetration.
Bad sealing.
Sheath heater.
■
Connect conduction and
non-conduction parts and
check with tester.
Conduction: NG.
Resistance
non-conduction parts and
check with tester.
Conduction: NG.
Resistance
∞
: OK.
3. Cooling Cycle Heavy Repair
3-1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant
NOTE) Please contact Songso company on +82-53-554-2067 if you have inquiry on heavy repair special facility.
TROUBLE DIAGNOSIS
- 82 -
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
(N
2
pressure:
during welding.
0.1~0.2 kg/cm
2
)
- Do not apply force to pipes before and
after welding to protect pipe from
cracking.
cracking.
3
N
2
sealed parts.
Confirm N
2
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 N
2
gas for more than 1 min
cap.
use the parts.
Sound:usable
No sound:not 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.
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 200
same time for
models above 200
L
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.
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.
can detect R141b in urethane. Please
practice, therfore, many times before use.
3-2. Summary Of Heavy Repair
TROUBLE DIAGNOSIS
- 83 -
Process
Contents
Tools
- Cut charging pipe ends and discharge refrigerant from
Filter, side cutters
drier and compressor.
- Use R134a oil and refrigerant for compressor and drier
Pipe Cutter, Gas welder, N
2
gas
- Confirm N
2
sealing and packing conditions before use.
Use good one for welding and assembly.
- Weld under nitrogen gas atmosphere.(N
2
gas pressure:
0.1-0.2kg/cm
2
).
- Repair in a clean and dry place.
- Evacuate for more than forty minutes after connecting
Vacuum pump(R134a
manifold gauge hose and vacuum pump to high (drier)
exclusively), Manifold gauge.
and low (compressor refrigerant discharging parts)
pressure sides.
- Evacuation Speed:113
l
/min.
- Weigh and control the allowance of R134a bombe in a
R134a exclusive bombe(mass
vacuum conditions to be
±
5 g with electronic scales and cylinder), refrigerant(R134a)
charge through compressor inlet
manifold gauge, electronic
(Charge while refrigerator operates).
scales, punching off flier,
- Weld carefully after inlet pinching.
gas welding machine
- Check leak at weld joints.
Electronic Leak Detector,
Minute leak: Use electronic leak detector
Driver(Ruler).
Big leak: Check visually or fingers.
Note:Do not use soapy water for check.
- Check cooling capacity
➀
Check radiator manually to see if warm.
➁
Check hot line pipe manually to see if warm.
➂
Check frost formation on the whole surface of the
evaporator.
- Remove flux from the silver weld joints with soft brush
Copper brush, Rag, Tool box
or wet rag.(Flux may be the cause of corrosion and
leaks.)
- Clean R134a exclusive tools and store them in a clean
tool box or in their place.
- Installation should be conducted in accordance with the
standard installation procedure.(Leave space of more
than 5 cm from the wall for compressor compartment
cooling fan mounted model.)
Trouble
diagnosis
Remove refrigerant
Residuals
Parts
replacement
and welding
Compressor
compartment
and tools
arrangement
Transportation
and
installation
Check
refrigerant leak
and cooling
capacity
Vacuum
Refrigerant
charging and
charging
inlet welding
3-3. Precautions During Heavy Repair
TROUBLE DIAGNOSIS
- 84 -
Items
Precautions
1. Use of tools.
1) Use special parts and tools for R134a.
2. Removal of retained
1) Remove retained refrigerant more than 5 minutes after turning off a refrigerator.
refrigerant.
(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.)
3. Replacement of drier.
1) Be sure to replace drier with R134a only when repairing pipes and injecting refrigerant.
4. Nitrogen blowing
1) Weld under nitrogen atmosphere in order to prevent oxidation inside a pipe.
welding.
(Nitrogen pressure : 0.1~0.2 kg/cm
2
.)
5. Others.
1) Nitrogen or refrigerant R134a 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.
1
2
Compressor
Low pressure side
Condenser
High pressure side
Drier
Evaporator
Click on the first or last page to see other GR-267 service manuals if exist.