LG GC-B207, Service Manual

Page: 123 / 145

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3-6. Practical Work For Heavy Repair
Item Precaution Utilities
1. Removal of
residual
refrigerant
2. Installed with
a Scharader
valve By
using the
LOKRING.
3. Vacuum
process
Pipe Cutter
Piercing Pliers
Schrader valve.
LOKRING
Vacuum pump
LOKRING
Nitrogen
cylinder
Portable
Leakage
Detector
Manometer
• You must discharge the residual refrigerant
(R600a) in the outdoor.
• For discharging the refrigerant R600a,
break the narrow portion of tube extension
by hand or with a pipe cutter as shown in
Figure.
• Leave if for 30~60min in outside to
stabilize the pressure with ambient.
• Check the pressure by piercing the dryer
part with pierching pliers. If the refrigerant
is not completely discharged, let the
refrigerator alone for more 30min in
outside.
• After the refrigerant is completely
discharged, repair any defective parts
and replace the dryer. At any case you
must use the LOKRING for connecting or
replacing any part in the cycle (No Fire,
No Welding).
• Connect the Schrader valve to pump with
the coupler. And then turn the pump on
for vacuum state.
• Let the pump run until the low-pressure
gauge indicates the vacuum (gauge
pressure 0, absolute pressure - 1atm or -
760mmHg).
• Recommended vacuum time is 30 min.
• Charge the N
2
gas in order to check for
leakage from welding points and the
LOKRING.
• If leakages are found, repair the defects
and repeat the vacuum process.
TROUBLE DIAGNOSIS
POINT TO BE
BROKEN
SERVICE TUBE EXTENSION
CHARGE TUBE
EXTENSION
LORKING
SCHRADER VALVE
(ONE-WAY VALVE)
TO THE VACUUM
PUMP
PRESSURE
GAUGE