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TROUBLE DIAGNOSIS
3. Cooling Cycle Heavy Repair
3-1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant
NO.
Items
1
Pipe and piping
system opening time.
2
Welding.
3
N
sealed parts.
2
4
Refrigeration
Evacuation
Cycle.
time
Vacuum
degree
Vacuum
Vacuum
piping
Pipe
coupler
Outlet
(Socket)
Plug
5
Refrigerant weighing.
6
Drier replacement.
7
Leak check.
NOTE) Please contact Songso company on +82-53-554-2067 if you have inquiry on heavy repair special facility.
Unit
Standards
Min.
Pipe:within 1 hour.
Comp:within
10 minutes.
Drier:within
20 minutes.
Nitrogen
Weld under
Pressure. Nitrogen
atmosphere
(N
pressure:
2
0.1~0.2 kg/cm
2
Confirm N
Confirm air leaking
2
leak.
sounds when
removing rubber
cap.
Sound:usable
No sound:not usable
Min.
More than
40 minutes.
Torr
Below 0.03(ref)
EA
High and low
Pressure sides are
evacuated at the
same time for
models above 200
EA
Use R134a
exclusive
manifold.
EA
Use R134a
cxclusive.
R134a exclusive.
R134a exclusive
EA
Use R134a
exclusively.
Weighing
allowance:±5g
Note:Winter:-5g
Summer:+5g
-Use R134a exclusively
for R134a refrigerator the moisture
-Use R12 exclusively
for R12 refrigerator
-Replace drier whenever
repairing refrigerator
cycle piping.
-Do not use soapy
water for check.
it may be sucked
into the pipe by.
- 76 -
Purposes
To protect
The opening time should be reduced to a
Moisture
half of the standards during rain and
Penetration. rainy seasons (the penetration of water
into the pipe is dangerous).
To protect
- Refet to repair note in each part.
oxide scale - R134a refrigerant is more susceptible to
formation.
leaks than R12 and requires more care
during welding.
)
- Do not apply force to pipes before and
after welding to protect pipe from
cracking.
To protect
- In case of evaporator parts, if it doesn't
moisture
noise when removing rubber cap blow
penetration.
dry air or N
use the parts.
To remove
moisture.
Note:Only applicable to the model
equipped with reverse flow protect
plate.
Vaccum efficiency can be improved by
operating compressor during evacuation.
L
To protect
The rubber pipes for R12 refrigerant shall
mixing of
be melted when they are used for R134a
mineral and refrigerant(causes of leak).
ester oils.
To protect
R12 Refri-
gerant mixing.
Do not mix
- Do not weight the refrigerant at too hot or
with R12
too cold an area.(25°C is adequate.)
refrigerant.
- Use copper bombe
Socket:2SV Plug: 2PV R134a
Note:Do not burn O-ring (rubber) during
welding.
To remove
from pipe.
Detect
-Check oil leak at refrigerant leak area.
refrigerant
Use electronic leak detector if oil leak is
leak area.
not found.
-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.
Remarks
gas for more than 1 min
2
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