LG LRTGC1815BK Service Manual page 13

• General Control of Refrigerating Cycle
NO, ITEMS UNIT
1 Pipe and Min,
piping system
opening time
Welding Nitrogen
pressure
N2 sealed Confirm
parts Nz leak
P, efiigeEvacuate
rati0n _me
STANDARDS
Pipe: within 1 hour.
Comp: within 10 minutes.
Drier: within 20 minutes.
Weld under Nitrogen
atmosphere.
(N2 pressure:
0.1 ~0.2 kg/cm =)
Confirm air leaking sounds
when removing robber cap.
Sound: usable
No sound: not usable
Min. More than 40 minutes
PURPOSES
To protect
moisture
penetration,
To protect oxide
scale formation.
To protect
moisture
penetration.
To remove moisture,
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-t34a refrigerant is more
susceptible to leaks than R-12 and
requires more care during welding,
- DOnot apply f_'ca to pipas before and
after welding to protect pipefrom cracking.
- In case of evaporator parts, if it
doesn't make sound when removing
rubber cap, blow dry air or N= gas for
more than I rain and use the parts.
Cycle ,.................t .................. _ ............................................................... ÷.................................... _ ................................................................................
Vacuum Ton" Below 0.03 (ref) Note: Onlu applicable to the model
degree equipped with reverse flow
protect piate.
................ i. .................. _............................................................... + .................................... b................................................................................
Vacuum EA High end low pressure sides Vacuum efficiency can be improved
are evacuated at the same by operating compressor during
time for models above 200 L evacuation.
Vacu_n EA Use R-134a exclusive To protect mixing The rubber pipes for R-12 refrigerant
piping manifold, of mineral end shall be melted when they ere used for
ester oils. R-134a refrigerant (causes of leak),
................ 1................... 1............................................................... ÷ .................................... _................................................................................
Pipe EA Use R-134a exclusive. To protect R-12
coupler refrigerant mixing.
................ 1................... 1............................................................... ÷ .................................... _................................................................................
Outlet R-134a exclusive.
(Socket)
Plug R-134a exclusive.
Refrigerant EA
weighing
Drier
replacement
Leak check
Use R-134a exolusiveiy.
Weighing allowance: +5g
Note: Winter: -5g
Summer: +5g
- Use R-134a exclusively for
R-134e refrigerator.
* Use R-12 exclusively for
R-12 refrigerator.
- Replace_er whenever repairing
reftigerater cyole p ipiog.
- Do not use soapy water for
check. It may be sucked
into the pipe by vacuum.
Do not mix with
R-12 refdgerent.
To remove the
moisture from
pipe inside.
Defect
refrigerant leak
area.
- Do not weigh the refrigerant at too
hot or too cold an area.
(77°F[25°C] is adequate,)
- Make Copper bombe
Socket: 2SV Plug: 2PV R-134a
Note: Do not burn O-dog (rubber)
during welding.
- Check oil leak at refrigerant leek
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.
Please practice, therefore, many
times before use.