LG GC-W061 series Service Manual page 19

5-4-2. General Control of Refrigerating Cycle
NO. ITEMS
WELDING
ROD
1
FLUX
2
LOKRING
(Figure 15,16)
3
DRIER
ASM
4
VACUUM
5
DRY AND
AIR
6 NITROGEN
GAS
NIPPLE
7
AND
COUPLER
PIPE
8
CONTENTS AND SPECIFICATIONS
(1) H 30
• 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 30min.
after unpacking.
(2) Keep the unpacked drier at the temperature
of 80~100 °C.
(1) When measuring with pirant Vacuum
gauge the charging M/C, 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/cm 2
(2) Temperature must be more than
-20~-70 °C.
(3) Keep the pressure at 12~6kg/cm
when substituting dry air for Nitrogen Gas.
(1) Check if gas leaks with soapy water.
(2) Replace Quick Coupler in case of leakage.
• Put all Joint Pipes in a clean box and
cover tightly with the lid so that dust or
humidity is not inserted.
• 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 M/C 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.
2 also
• Check if gas leaks from joint of the
Coupler.
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REMARKS