LG LRTBC2021BS Service Servicing Precautions page 11

• General Control of Refrigerating Cycle
NO. ffEMS
1 Pipe and
piping system
opening time
2 Welding
3 N= sealed
3arts
4
UNIT STANDARDS
Min. Pipe: within 1 hour.
Comp: within 10 minutes.
Drier: within 20 minutes.
N_ogen Weld under Nitrogen
_ressure atmosphere.
(N2 pressure:
0.1-0.2 kg/cm _)
Confirm Confirm air leaking sounds
N_ leak when removing rubber cap.
Sound: usable
No sound: not usable
Refrige- E vacuation M in.
ram lime
More than 40 minutes
PURPOSES
To protect
moisture
)enetration.
To protect oxide
scale formation.
To protect
moisture
)enetration.
To remove nlo}sture.
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).
- 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 f_rce to pipes before and
after welding to protect pipe from cradling.
- In case of evaporator parts, if it
doesn't make sound when removing
rubber cap, blow dry air or N= gas for
more than 1 rain and use the parts.
Cycle ..........................................................................................................................................................................................................................
Vacuum Torr Below 0.03 (raf) 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 200 1. evacuation.
Vacuum EA Use R-134a exclusive I Toprotectmixng TberubberplpesforR-12rafdgerent
p_ng 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
coupk_ refrigerant mixing.
OLJtlet R-134a exclusive. "
(Sod_
P_
5 Refrigerant
weighing
6 Drier
replacement
7 Leak check
EA
R- 134a exclusive.
Use R-134a exclusively,
Weighing allowance:+5g
Note: Winter: -5g
Summer: +5g
- Use R-134a exclusively for
R-134a refrigerator.
- Use R-12 exclusively for
R-12 refrigerator.
- Replace dder whenever repaking
e_:jerat_ cy_ _g.
- 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
area.
-15-
- Do not weigh the refrigerant at too
hot or too cold an area.
(77°F[25°C] is adequate.)
- MakeCopperI_rnbe (De_cefiling_fdgerant)
Socket: 2SV Plug: 2PV R-134a
Note: Do not burn O-ring (bushing)
during welding.
- Check oil leak at refrigerant leak
area. Use electrenic 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.