LG Styler S3RERB Service Engineering Manual page 46

6-4-3. Precautions When Performing Major Repair
Category
1. Using tools Be sure to use the parts and tools that are designed for R134a.
1) Remove the remaining refrigerant at least 5 minutes after you turn off the styler. (Otherwise, the Internal
oil may leak.)
2. Removing
the remaining
2) When you remove the refrigerant, first cut the high pressure side (dryer part) with the wire cutter and
refrigerant
then cut the low pressure side to drain the remaining refrigerant. (If you do this in the opposite order, large
amount of oil may leak. So, be sure to follow the cutting order.)
3. Replacing dryer Be sure to use the dryer for F134a when repairing the pipe or injecting the refrigerant.
4. Nitrogen
To prevent oxidation scale from forming inside the pipe due to the welding heat, be sure to perform
substitution
nitrogen substitution at the specified nitrogen pressure while welding (nitrogen pressure: 0.1 - 0.2 kg/㎠).
welding
1) Be sure to use only the nitrogen gas or R134a refrigerant when you are cleaning up the inside of the cycle
pipe or refilling it.
2) Be sure to conduct leakage inspection using the electronic leakage detector.
5. Others
3) Be sure to use the pipe cutter when you cut the pipe.
4) Make sure that no water penetrates into the cycle.
6-4-4 Details of Major Repair
Category
1. Removing
the
remaining
refrigerant
① Remove the remaining refrigerant at least 5 minutes after you turn off the styler.
(Otherwise, the Internal oil in the compressor may leak.)
② When you remove the refrigerant, first cut the high pressure side (dryer part) with the wire cutter and
then cut the low pressure side to drain the remaining refrigerant slowly.
If you perform welding without nitrogen substitution, oxidation scale may form inside the pipe and
2. Welding
Replacing dryer
using
Assemble the dryer and conduct welding while blowing nitrogen gas (0.1 - 0.2 kg/) to the high pressure
nitrogen
side.
substitution
Replacing compressor
Conduct welding while blowing nitrogen gas to the low pressure side.
Note) Possibility of oxidation scale forming in other parts is very low due to the short welding time. So, the
High pressure
Important: Follow the order for removing the refrigerant.
(Otherwise, the compressor oil may leak.)
deteriorate the performance and reliability of the
nitrogen substitution is not necessary in those parts.
Precautions
Precautions
Important
46
Low pressure
product.