LG Styler S3RERB - Page 44

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6-4. Conducting Major Repair of Heat Pump Cycle
6-4-1. Repair Work Standards for the Styler that Uses Refrigerant R134a
No. Work Category
Unit Work Standards Purpose Remarks
Opening time for pipe
and pipe parts
Minutes
Pipe parts: Within 1 hour
Compressor: Within 10 minutes
Dryer: Within 20 minutes
To prevent water from
penetrating
When it is rainy, reduce the time to
lower than half of the specied time.
(Water penetrating into pipe can be
detrimental.)
Welding work
Nitrogen
supply
pressure
Be sure to perform welding while
supplying nitrogen.
(Nitrogen pressure: 0.1 - 0.2 kg/cm
2
)
To prevent oxidation
scale from forming
inside the pipe due to
the welding heat
- For the details on the work methods
for dierent parts, refer to the
Precautions for Major Repair.
- When you weld the pipes, delicate
welding is required since the size of
R134a refrigerant molecule is very
small. Otherwise, the refrigerant may
leak through tiny holes.
- Do not apply force to the pipe parts
before/after welding. Otherwise, it
may cause crack (leakage) on the
pipe.
Styler
cycle
Vacuum time Minutes 40 minutes or more To remove moisture
Vacuum level
Torr
0.03 Torr or below (reference value)
Vacuum area
Apply high/low pressure vacuum at
the same time.
Vacuum pipe
EA
Use manifold for R134a.
Pipe coupler
EA
Model and manufacturer compatible
with R134a
Socket
EA
Plug for
R134a
EA
For R134a
Measuring the amount of
refrigerant
(Cylinder)
EA
Use R134a. The measurement
tolerance is ±5 g.
Note) In the winter, you may want to
reduce the amount by 5 g and, in the
summer, increase the amount by 5 g.
Do not mix it with
other refrigerant.
- Do not measure the refrigerant
amount in a place where the ambient
temperature is too high or too low
(the ambient temperature of approx.
25  is most suitable).
- Use the copper (Cu) on the body
part when you manufacture another
cylinder.
Replacing dryer
- Use the one for R134a.
- Be sure to replace the dryer when
you repair the cycle pipe.
To remove the
moisture left inside
the pipe.
Leakage inspection
- Never use soapy water to check for
the leakage. Soapy water may ow
into the pipe during the vacuum
cycle due to the vacuum inside the
pipe.
- Leakage detector model:
10170.16500 Manufacturer:
Robinair, U.S.A
To detect the leakage
of refrigerant
- When you check for the leakage of
refrigerant, be sure to check whether
oil has leaked. If you cannot detect
the oil leakage, use an electronic
leakage detector.