LG LTCS20020 Series Service Manual page 20

General Control of Refrigerating Cycle
NO. ITEMS
WELDING (1) H 30
ROD
(2) Bcup-2
1
FLUX
2
DRIER
(1) Assemble the drier within 30min. after
ASM
unpacking.
3
(2) Keep the unpacked drier at the temperature
of 80~100°C.
VACUUM (1) When measuring with pirant Vacuum gauge
of 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
4
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.
DRY AND (1) The pressure of dry air must be more than
12~16Kg/cm
AIR
5 (2) Temperature must be more than -20~-70°C.
NITROGEN
GAS (3) Keep the pressure to 12~6Kg/cm
substituting dry air for Nitrogen Gas.
NIPPLE AND
(1) Check if gas leaks with soapy water.
6
COUPLER
(2) Replace Quick Coupler in case of leakage.
PIPE
7
CONTENTS AND SPECIFICATIONS
Chemical Ingredients
Ag : 30%, Cu : 27%, Zn : 23%, Cd : 20%
Brazing Temperature : 710~840°C
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.
2
Put all Joint Pipe 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 a day.
Holding period : 1 day
Close the cover of container to prevent dust
putting in the FLUX.
Keep it in a stainless steel container.
Don't keep the drier in a outdoor 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.
also when
2
Check if gas leaks from connecting part of
Coupler.
20
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