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LG LRTBC1825T Service Servicing Precautions page 13

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General Control of Refrigerating
Cycle
NO,
1
2
3
4
ffEMS
Pipe and
piping system
opening time
Welding
N2 sealed
3arts
rain
UNIT
Min,
STANDARDS
Pipe: within I hour.
Comp: within 10 minutes,
Drier; within 20 minutes,
Nitrogen
Weld under Nitrogen
)reesure
atmosphere.
N2 pressure:
0.1-0.2
kg/cm _)
Confirm
Confirm air leaking sounds
N21eak
when removing rubbercap.
Sound: usable
No sound: not usable
Min.
More than 40 minutes
PURPOSES
To protect
moisture
)enetration.
To protect oxide
scale formation.
To_otect
moi_um
)enetretlen.
TO removemoisture,
REMARKS
The opening time should be reduced
to a half of the standards dudng rain
and rainy seasons (the penetration of
water into the pipe is dangerous).
- Refer to repair note in each part.
- R-134a refrigerant is more
susceptible
to leaks than R-12 and
requires more care dudng welding.
- Do not apply force to pipes before and
a_er weldingtoproted pipefromcracking.
- In case of evaporator
parts, if it
doesn't make sound when removing
rubber cap, blow dry air or N2 gas for
more than 1 rain and use the parts,
Cycle .........................................................................................................................................................................................................................
Vacuum
Torr
Below 0.03 (ref)
Note: Only applicable
to the model
degree
equipped with reverse flow
protect plate,
Vacuum
EA
High and low pressure sides
Vacuum efficiency can be improved
are evacuated at the same
by operating compressor
during
time for models above 260/.
evacuation.
Vacuum
EA
Use R-134a exclusive
To protect mixing
The rubber pipes for R-12 refrigerant
piping
manifold,
of mineral and
shall be meRed when they are used for
ester oils.
R-134a refrigerant (causes of leak.)
Pipe
EA
Use R-134a exclusive.
To protect R-12
coupler
refrigerant m_ng.
Outlet
R-134a exclusive.
(Sod_et)
Plug
R-134a exclusive.
Refrigerant
weighing
Drier
replacement
Leak check
EA
Use R-134a exclusively.
Weighing allowance: :_Sg
Note: Winter: -5g
Summer: +5g
* Use R-134a exclusively for
R-134a refdgeretor.
* Use R-12 exclusively for
R-12 refrigerator.
- Replacedde-whenever repeidng
ref_era_ cyde piing.
- Do not use soapy water for
check. It may be sucked
into the pipe by vacuum.
Do not mix with
R-12 refrigerant.
To remove the
moisture from
pipe inside.
Defect
refrigerant
leak
aree.
- Do not weigh the refrigerant at too
hot or too cold an area.
(77°F[25°C]
is adequate.)
- MakeCopperbornbe(Device 1i11_g relfi_rant)
Socket: 2SV
Plug: 2PV R-134a
Note: Do not burn O-ring (bushing)
dunng 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 R-141b in urethane.
Practice many times before using
this type of detector.
-15-

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