Major Repair Method For Freezing Cycle - LG GR-K192UF Service Manual

Major repair method for freezing cycle

Chapter 8. Major repair method for freezing cycle
8-1. Major repair work standard for refrigerator using R134a refrigerant
No. Work item Unit
1 Opening time Min
for pipe and
piping parts
2 Welding work Nitrogen
supply
pressure
Vacuum
3 Refrig Min
time
erator
Torr
Vacuum
cycle
degree
Vacuum
part
Vacuum
EA
piping
Pipe
EA
coupler
Socket
EA
Plug
EA
Refrigerator
4 EA
cycle
Refrigerant
measurement
(BOMBE)
Exchange drier
5
Leakage test
6
Work standard
Pipe part: Within 1 hour
Compressor: Within 10 minutes
Drier: Within 20 minutes
Do the welding while supplying
the nitrogen.
(Nitrogen pressure: .1-0.2kg/cm 2 )
40 minutes or more
0.03 Torr or below (reference)
Simultaneous vacuum for high
and low pressure
Use manifold for R134a
Model name: 40134A
Manufacturer: US Robin Air
For R134a
Model name: PCV630-2SV 1EA
Model name: PCV400-2PV 1EA
Manufacturer: Japanese Nito
For R134a
Model name: 2SV
For R134a
Model name: 2PV
Use the one for R134a and the
measurement tolerance is ±5g.
Note) If it is -5g for winter and +5g
for summer, it is well
managed. (manufactured
by LG)
- For R134a
- When repairing the refrigerator
cycle piping, always exchange
the drier.
- Never do a soap water test. The
soap water can leak into the
piping from the vibration.
- Leakage detector model: 16170,
16500. Manufacturer: US Robin Air
- 35 -
Objective
Prevent moisture Specially manage to half or lower of the prior
penetration standard during rain or rainy season.
(Especially the water penetration within the
piping can be crucial)
Prevent oxidization - Refer to the Caution section of the major repair
scale generation part for work methods of each part.
within the pipe from - Because the R134a refrigerant has a smaller
high temperature molecular size than that of R12 refrigerant,
heat during welding special care is needed when welding the pipe
because leakage can occur more easily.
- Do not apply pressure to the parts of the piping
before and after the welding. It can cause the
pipe to crack and cause leakage.
Remove moisture Manufacturer of 113l/min model WVP-Z: US
Asco
Note) The model should have a counter-current
blocker.
The vacuum effect can be increased during a
Prevent mixed vacuum with both high and low pressure while
penetration of operating the compressor.
mineral oil and For the refrigerant piping (rubber type), using
ether oil the existing piping for R12 for the new R134a
Prevent mixed refrigerant can cause the rubber to be melted
penetration of R12 (can cause leakage).
refrigerant
Prevent mixed
penetration of R12
refrigerant
Prohibit mixed use
of R12 refrigerant
Prohibit mixed use - When measuring the refrigerant, do not measure
of R12 refrigerant it in a very hot or cold location (ambient
temperature of 25°C is best) When manufacturing
an additional bombe, use copper for the material.
- End socket: 2SV plug: Use the proper one for
Note) When welding the connection part of both ends,
make sure the internal O ring (rubber) does not burn.
Remove moisture
existing within the
piping
Detect refrigerant - For the refrigerant leaking part, check if oil is
leakage part leaked and if not found, use the electric leakage
detector.
(for reference)
Remarks
2PV R134a