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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.
5
Welding.
N2sealed parts.
Refrigeration
Cycle.
Unit
Min.
Nitrogen
Pressure.
6
Evacuation
Confirm N2
leak.
Min.
Standards
Pipe:within
1 houn
Comp:within
10 minutes,
Dhar:within
20 minutes,
Weld under
Nitrogen
atmosphere
(N2 pressure:
0.1-0.2 kg/cm 2)
Confirm air leaking
sounds when
removing rubber
cap.
Sound:usable
No sound:not usable
More than
Purposes
To protect
Moisture
Penetration,
To protect
oxide scale
formation.
To protect
moisture
)enetration.
To remove
Remarks
The opening time should be reduced to a
half of the standards during rain and
rainy seasons (the penetration of water
into the pipe is dangerous).
-Refet 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.
- In case of evapc)rator parts, if it doesn't
noise when removing rubber cap blow
dry air or N2 gas for more than 1 rain
use the parts.
t!me
.....
40 m!nutes.
.
mois!ure.
.
Vacuum
Tort
Below O.03(ref)
Note:Only applicable to the model
degree
equipped with reverse flow protect
........
I......
p!a!e.
.........
vacuum
EA
High and low
Vaccum efficiency can be improved by
Pressure s des are
, operat ng compressor during evacuation.
evacuated at the
same time for
models above 20_
Vacuum
EA
Use R134a
To protect
The rubber pipes for R12 refrigerant shall
piping
exclusive
mixing of
i be melted when they are used for R134a
manifold,
mineral and
refdgerent(causes of leak).
ester oils,
Pipe
EA
Use R134e
To protect
coupler
cxclusive.
R12 R, e fr_-
Outlet
R134a exclusive.
(Socket)
Plug
Refrigerant
weighing.
Dder replacement.
EA
Leak check.
R134a exclusive
Use R134a
exclusively.
Weighing
allowa nce::t:Sg
Note:Wiater:-Sg
Summer:+5g
-Use R134aexclusively
forR134a refdgerator
-Use R12 exclusively
for R12 refngerator
-Replace drierwhenever
repairing refrigerator
cycle piping.
-Do not use soapy
water for check.
it may be sucked
into the pipe by.
erantmixing.
Do not mix
with R12
refrigerant,
To remove
the moisture
from pipe.
Detect
refrigerant
leak area.
Do not weight the refrigerant at too hot or
too cold an area.(25°C is adequate.)
Use copper bombe
Socket:2SV
plug: 2PV R134a
Note:Do not burn O-dng (rubber) dutll_J
welding.
-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, therfore, many times before use
NOTE) Please contact Songso company on +82-53-554÷2067if you have inquiryon heavy repair special facility.
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