LG LRSC26980TT Service Manual - Page 90

Cooling Cycle Heavy Repair

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TROUBLE DIAGNOSIS Cooling Cycle Heavy Repair 1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant NO. Items Unit Standards Purposes Remarks 1 Pipe and piping system opening time. Min. Pipe:within 1 hour. To protect The opening time should be reduced to a 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 Pressure. Weld under Nitrogen atmosphere (N2 pressure: 0.1~0.2 kg/cm2) To protect oxide scale formation. - Refer to repair note in each part. - R134a refrigerant is more susceptible to leaks than R12 and requires more care during welding. - Do not apply force to pipes before and after welding to protect pipe from cracking. 3 N2 sealed parts. Confirm N2 leak. Confirm air leaking sounds when removing bushing cap. Sound:usable No sound:not usable To protect moisture penetration. - In case of evaporator parts, if it doesn't make noise when removing bushing cap blow dry air or N2 gas for more than 1 min use the parts. 4 Refrigeration Evacuation Cycle. time Min. More than 40 minutes. To remove moisture. Vacuum degree Torr Below 0.03(ref) Note:Only applicable to the model equipped with reverse flow protect plate. Vacuum EA High and low Pressure sides are evacuated at the L same time for models above 200 Vacuum efficiency can be improved by operating compressor during evacuation. Vacuum piping EA Use R134a exclusive manifold. To protect The bushing pipes for R12 refrigerant shall mixing of be melted when they are used for R134a mineral and refrigerant causes of leak. ester oils. Pipe coupler EA Use R134a cxclusive. To protect R12 Refrigerant mixing. Outlet (Socket) R134a exclusive. ˝ Plug 5 Refrigerant weighing. R134a exclusive ˝ EA Use R134a Do not mix - Do not weigh the refrigerant at too hot or exclusively. with R12 too cold an area. (25°C[77°F] is adequate.) Weighing refrigerant. - Use copper charging canister 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 -Replace drier whenever from pipe. repairing refrigerator cycle piping. 7 Leak check. -Do not use soapy water for check. It may be sucked into the pipe. Detect refrigerant leak area. -Check oil leak at refrigerant leak area. Use electronic leak detector if oil leak is not found. -The electronic leak detector is very sensitive to halogen gas in the air. It also can detect R141b in urethane. Please practice, therefore, many times before use. - 90 -

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Cooling Cycle Heavy Repair
1. The Heavy Repair Standards for Refrigerator with
R134a Refrigerant
TROUBLE DIAGNOSIS
- 90 -
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
- Refer 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.
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
make noise when removing bushing
removing bushing
penetration.
cap blow dry air or N
2
gas for more than
cap.
1 min 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
Vacuum efficiency can be improved by
Pressure sides are
operating compressor during evacuation.
evacuated at the
same time for
models above 200
Vacuum
EA
Use R134a
To protect
The bushing 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 weigh the refrigerant at too hot or
exclusively.
with R12
too cold an area. (25°C[77°F] is adequate.)
Weighing
refrigerant.
- Use copper charging canister
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
-
Replace drier whenever
from pipe.
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.
-The electronic leak detector is very
sensitive to halogen gas in the air. It also
can detect R141b in urethane. Please
practice, therefore, many times before use.