LG Styler S3RERB Service Engineering Manual page 45

6-4-2. Overview of Major Repair Work
Work sequence
1. Diagnosing
failure
2.
Cut the ends of the pipe on the dryer side (high pressure) and the
Removing the remaining
compressor charging side to drain the refrigerant.
refrigerant
- Be sure to use the R134a refrigerant and the compressor, dryer, and oil
that are designed for R134a.
- If the part you are using is nitrogen- or vacuum-packed, check whether
you can hear the sound of nitrogen gas coming out when you open the
3.
packing. If you can, it means the packing is in good condition. Only use
Replacing and
the part whose packing is in good condition. Assemble or weld the part
welding parts
immediately once you open the packing.
- Be sure to perform nitrogen substitution when you weld the parts.
Nitrogen pressure: 0.1 - 0.2 kg/cm2
- Be sure to conduct repair work on a clean and dry place.
- Connect the hose and vacuum pump of the manifold gauge to the high
4.
pressure side (dryer part) and low pressure side (compressor refrigerant
Vacuum
charging part) and apply vacuum for 60 minutes or more.
degasification
- Vacuum degasification speed: 113 ℓ/min
- Measure the cylinder for R134a provided by LG using the electronic
5.
scale in vacuum state within ±5 g of the specified volume and inject the
Charging the
refrigerant into the refrigerant charging part of the
refrigerant and
(inject refrigerant while operating the product).
welding the inlet
- Pinch the inlet and carefully weld it.
- Conduct leakage inspection on the part that you welded.
- Fine leakage: Use the electronic leakage detector.
- Excessive leakage: Leakage of the compressor oil can be detected visually
6.
or with finger.
Checking leakage
* Caution: Do not conduct leakage inspection with soapy water.
and performance
- Cooling performance inspection
of refrigerant
 Check if it is warm when you touch the pipe, cond In, and condenser
with your hand.
 Check if the moisture is evenly distributed on the surface of the
evaporator.
- Clean the flux on the silver welding part with soft brush or wet cloth (flux
7. can be a cause of corrosion and leakage).
Cleaning machine - Wipe out the dust and moisture from the tools for R134a and store them
room and tools in a clean tool box. Put the tool box in a location where you can find it
easily.
8.
Installation after moving the product should be conducted according to the
installation method described in the Repair Work Standards for Styler. (Keep
Moving /
the distance of 5 cm or more from the wall.)
installation
Details of major repair
styler
45
Work tools
Plier, wire cutter
Pipe cutter, gas welding
machine, nitrogen gas
welding rod (silver soldering:
IS-430B, copper soldering:
Bcup-2)
Flux (Hydrox Korea)
Vacuum pump (for R134a),
manifold gauge
Cylinder for R134a, refrigerant
R134a, manifold gauge,
compressor
electronic scale, pinch-off
plier, gas welding machine
Electronic leakage detector,
screwdriver (+)
Brass brush, cloth, tool box