LG GR-B-L-P207 SERIES Service Manual ▷ View online
2-4. Cooling
TROUBLE DIAGNOSIS
- 84 -
Problems
Causes
Checks
Measures
Remarks
High
Refrigerant leak.
Check sequence
Weld the leaking part, recharge the
Drier must be replaced.
temperature
1. Check the welded parts of the
refrigerant.
in the freezer
drier inlet and outlet and drier
compartment.
auxiliary in the compressor
compartment (high pressure side).
2. Check the end of compressor
sealing pipe (low pressure side).
3. Check silver soldered parts.
(Cu + Fe / Fe + Fe).
4. Check bending area of wire
condenser pipe in compressor
compartment (cracks can
happen during bending).
5. Check other parts (compressor
compartment and evaporators in
freezer compartment).
Shortage of refrigerant.
Check frost formation on the surface
- Find out the leaking area, repair,
Drier must be replaced.
of evaporator in the freezer
evacuate, and recharge the
compartment.
refrigerant.
- If the frost forms evenly on the
- No leaking, remove the remaining
surface, it is OK.
refrigerant, and recharge new
- If it does not, it is not good.
refrigerant.
TROUBLE DIAGNOSIS
- 85 -
Problems
Causes
Checks
Measures
Remarks
High
Cycle pipe is clogged.
Check sequence.
- Heat up compressor discharging
Direr must be replaced.
temperature in
1. Check temperature of condenser
weld joints with touch, disconnect
the freezer
manually.
the pipes, and check the clogging.
compartment.
If it is warm, it is OK.
Remove the causes of clogging,
If it is not, compressor discharging
weld, evacuate, and recharge
joints might be clogged.
the refrigerant.
2. Manually check whether hot line
- If it's warm, it's OK. If it's not,
pipe is warm.
condenser discharging line weld
If it is warm, it's OK.
joints might be clogged.
If it is not, condenser outlet weld
Disconnect with torch, remove the
joints might be colgged.
causes, evacuate, and recharge
seal refrigerant.
Leak at loop pipe weld joint
Check sequence.
Replace the compressor, weld,
Drier must be replaced.
(discharge) in compressor.
1. Manually check whether
evacuate, and recharge refrigerant.
condenser is warm, It is not warm
and the frost forms partly on the
evaporator in the freezer
compartment.
Faulty cooling fan in the compressor
Check sequence.
- Replace if motor does not operate.
compartment.
1. Check cooling fan operation.
- If fan is disconnected, check fan
2. Check that cooling fan is
damage and reassemble it.
disconnected from the motor.
■
Refer to fan motor disassembly
and assembly sequence.
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
- 99 -
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.