Refrigerating Cycle - LG GC-B379S*QA Service Manual

General Control of Refrigerating Cycle
NO. ITEMS
1. WELDING ROD
2. FLUX
LOKRING
3.
(Figure 23,24)
4. DRIER ASM
5. VACUUM
DRY AND AIR
6.
NITROGEN GAS
NIPPLE
7.
AND COUPLER
PIPE
8.
CONTENTS AND SPECIFICATIONS
(1)H30
• Chemical Ingredients Ag: 30%, Cu:
27%, Zn: 23%, Cd: 20%
• Brazing Temperature: 710~840°C
(2) Bcup-2
• Chemical Ingredients Cu: About 93% P:
6.8-7.5% The rest: within 0.2%
• Brazing Temperature: 735~840°C
• Ingredients and how to make Borax 30%
Borax 35%
Fluoridation kalium: 35% Water: 4%
Mix the above ingredients and boil until they are
transformed into liquid.
(1) Both of the tube is inserted up to the stop.
(2) Both of the LOKRING is pushed up to the stop
(3) The bending point is not too close to the
joint ending.
(4) During the assembly it is important that
both ends remain completely within the
joint.
(1) Assemble the drier within 3Omin.
after unpacking.
(2) Keep the unpacked drier at the temperature
of80~100°C.
(1) When measuring with pirant Vacuum
gauge the charging / , vacuum
degree is within 1 Torr.
(2) If the vacuum degree of the cycle inside is
10 Torr. below for low pressure and 20 Torr.
for high pressure, it says no vacuum
leakage state.
(3) Vacuum degree of vacuum pump must be
0.05 Torr. below after 5 min.
(4) Vacuum degree must be same to the
value described item (2) above for more
than 20 min.
(1) The pressure of dry air must be more
han 12~16kg/cm2
(2) Temperature must be more than
-20~-70°C.
(3) Keep the pressure at 12~6kg/cm2 also
when substituting dry air for Nitrogen Gas.
(1) Check if gas leaks with soapy water.
(2) Replace Quick Coupler in case of leakage.
(1) Put all Joint Pipes in a clean box and cover
tightly with the lid so that dust or humidity
is not inserted.
TROUBLESHOOTING (Mechanical Part)
• Recommend H34 containing
34% Ag in the Service Center.
• Make amount for only day.
Holding period: 1 day
• Close the cover of container to prevent dust
putting in the FLUX.
• Keep it in a stainless steel container.
• For a hermetically sealed metal/metal
connection, the tube ends have to be clean.
• LOKPREP is distributed all of out-surface of
the tube ends.
• Don't keep the drier in a outdoors because
humidity damages to it.
• Apply / Vacuum Gauge without fail.
• Perform vacuum operation until a proper
vacuum degree is built up.
• If a proper vacuum degree isn't built up,
check the leakage from
the Cycle Pipe line part and Quick Coupler
Connecting part.
• Check if gas leaks from joint of the Coupler
18
REMARKS