LG GR-T622 Service Manual ▷ View online
6-5 REFRIGERATING CYCLE
- 14 -
▼
Troubleshooting Chart
▼
Leakage Detection
●
Observe discharging point of refrigerant which may be in the oil discharging part in the compressor and hole of evaporator.
YES
YES
Whether Compressor
runs or not.
runs or not.
Whether frost
forms or not in
Evaporator.
forms or not in
Evaporator.
Observe the discharged
amount of Refrigerant.
amount of Refrigerant.
Inject Refrigerant to Compressor
and check cooling operation.
and check cooling operation.
Clogged by dust.
Gas leakage.
Faulty
Compressor.
Compressor.
Moisture Clog.
Whether oil
leaks or not.
leaks or not.
Frost formed normally
Normal amount
No or much amount
(Check the leakage point)
Frost formed normally
No frost
or forms
or forms
in inlet only
Check Compressor
PARTIAL
Freezer room and
Low flowing sound of
A little high
• A little Refrigerant
LEAKAGE
Refrigerator
Refrigerant is heard and
more than
•
discharges.
don't cool
frost forms in inlet only
ambient
• Normal cooling is possible
normally.
temperature.
•
when injecting of Refrigerant
•
the regular amount.
WHOLE
Freezer room and
Flowing sound of Refrigerant
Equal to ambient
• No discharging of Refrigerant.
LEAKAGE
Refrigerator
is not heard and frost isn't
temperature.
• Normal cooling is possible
don't cool
formed.
•
when injecting of Refrigerant
normally.
•
the regular amount.
PARTIAL
Freeze room and
Flowing sound of Refrigerant
A little high
• Normal discharging of
CLOG
Refrigerator
is heard and frost forms
more than
•
refrigerant.
don't cool
in inlet only.
ambient
• The capillary tube is faulty.
normally.
temperature.
WHOLE
Freezer room and
Flowing sound of Refrigerant
Equal to ambient
• Normal discharging of
CLOG
Refrigerator
is not heard and frost isn't
temperature.
•
Refrigerant.
don't cool.
formed.
MOISTURE
Cooling operation
Flowing sound of Refrigerant
Low than
• Cooling operation restarts
CLOG
stops periodically.
is not heard and frost melts.
ambient
•
when heating the inlet of
temperature
•
capillary tube.
COMP-
Freezer and
Low flowing sound of
A little high
• The pressure of high
RESSION
Refrigerator
Refrigerant is heard and
than ambient
•
pressure part in
don't cool.
frost forms in inlet only.
temperature.
•
compressor is low.
NO COMP-
No compressing
Flowing sound of Refrigerant
Equal to ambient
• No pressure of high pressure
RESSION
operation.
is not heard and no frost.
temperature.
•
part in the compressor.
CAUSE
TEMPERATURE
OF THE
COMPRESSOR
REMARKS
STATE OF
THE SET
STATE OF THE
EVAPORATOR
LEAKA
G
E
CLOGGED
BY
DUST
DEFECTIVE
COMPRESSION
- 15 -
NO.
ITEMS
CONTENTS AND SPECIFICATIONS
REMARKS
WELDING
(1) H 30
ROD
(1)
• Chemical Ingredients
• Recommend H34 containing 34% Ag in the
(1) •
Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20%
•
Service Center.
(1)
• Brazing Temperature: 710~840
°
C
(2) Bcup-2
(1)
• Chemical Ingredients
(1) •
Cu: About 93%
(1) •
P: 6.8~7.5%
(1) •
The rest: within 0.2%
(1)
• Brazing Temperature: 735~840
°
C
FLUX
(1)
• Ingredients and how to make
• Make amount for only day.
( 1 )
(1) ••
Borax 30%
•
Holding period: 1 day
(1) ••
Borax 35%
• Close the cover of container to prevent dust
(1) •
Fluoridation kalium: 35%
•
putting in the FLUX.
(1) •
Water: 4%
• Keep it in a stainless steel container.
(1) •
Mix the above ingredients and boil until
(1) •
they are transformed into liquid.
DRIER
(1) Assemble the drier within 30min.
• Don't keep the drier in a outdoors because
ASM
(1)
after unpacking.
•
humidity damages to it.
(2) Keep the unpacked drier at the temperature
of 80~100
°
C.
VACUUM
(1) When measuring with pirant Vacuum
• Apply M/C Vacuum Gauge without fail.
(1 )
gauge the charging M/C, vacuum
• Perform vacuum operation until a proper
(1 )
degree is within 1 Torr.
•
vacuum degree is built up.
(2) If the vacuum degree of the cycle inside is
• If a proper vacuum degree isn't built up,
•
(2)
10 Torr. below for low pressure and 20 Torr.
•
check the leakage from
(2)
for high pressure, it says no vacuum
•
the Cycle Pipe line part and
(2)
leakage state.
•
Quick Coupler Connecting part.
(3) Vacuum degree of vacuum pump must be
(3)
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.
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
2
also
(3)
when substituting dry air for Nitrogen Gas.
NIPPLE
(1) Check if gas leaks with soapy water.
• Check if gas leaks from joint of the
AND
(2) Replace Quick Coupler in case of leakage.
•
Coupler.
COUPLER
PIPE
(1)
• Put all Joint Pipes in a clean box and
(1)•
cover tightly with the lid so that dust or
(1)•
humidity is not inserted.
1
2
3
4
5
6
7
DRY AND
AIR
NITROGEN
GAS
AIR
NITROGEN
GAS
▼
General Control of Refrigerating Cycle
- 15 -
NO.
ITEMS
CONTENTS AND SPECIFICATIONS
REMARKS
WELDING
(1) H 30
ROD
(1)
• Chemical Ingredients
• Recommend H34 containing 34% Ag in the
(1) •
Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20%
•
Service Center.
(1)
• Brazing Temperature: 710~840
°
C
(2) Bcup-2
(1)
• Chemical Ingredients
(1) •
Cu: About 93%
(1) •
P: 6.8~7.5%
(1) •
The rest: within 0.2%
(1)
• Brazing Temperature: 735~840
°
C
FLUX
(1)
• Ingredients and how to make
• Make amount for only day.
( 1 )
(1) ••
Borax 30%
•
Holding period: 1 day
(1) ••
Borax 35%
• Close the cover of container to prevent dust
(1) •
Fluoridation kalium: 35%
•
putting in the FLUX.
(1) •
Water: 4%
• Keep it in a stainless steel container.
(1) •
Mix the above ingredients and boil until
(1) •
they are transformed into liquid.
DRIER
(1) Assemble the drier within 30min.
• Don't keep the drier in a outdoors because
ASM
(1)
after unpacking.
•
humidity damages to it.
(2) Keep the unpacked drier at the temperature
of 80~100
°
C.
VACUUM
(1) When measuring with pirant Vacuum
• Apply M/C Vacuum Gauge without fail.
(1 )
gauge the charging M/C, vacuum
• Perform vacuum operation until a proper
(1 )
degree is within 1 Torr.
•
vacuum degree is built up.
(2) If the vacuum degree of the cycle inside is
• If a proper vacuum degree isn't built up,
•
(2)
10 Torr. below for low pressure and 20 Torr.
•
check the leakage from
(2)
for high pressure, it says no vacuum
•
the Cycle Pipe line part and
(2)
leakage state.
•
Quick Coupler Connecting part.
(3) Vacuum degree of vacuum pump must be
(3)
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.
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
2
also
(3)
when substituting dry air for Nitrogen Gas.
NIPPLE
(1) Check if gas leaks with soapy water.
• Check if gas leaks from joint of the
AND
(2) Replace Quick Coupler in case of leakage.
•
Coupler.
COUPLER
PIPE
(1)
• Put all Joint Pipes in a clean box and
(1)•
cover tightly with the lid so that dust or
(1)•
humidity is not inserted.
1
2
3
4
5
6
7
DRY AND
AIR
NITROGEN
GAS
AIR
NITROGEN
GAS
▼
General Control of Refrigerating Cycle
- 15 -
NO.
ITEMS
CONTENTS AND SPECIFICATIONS
REMARKS
WELDING
(1) H 30
ROD
(1)
• Chemical Ingredients
• Recommend H34 containing 34% Ag in the
(1) •
Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20%
•
Service Center.
(1)
• Brazing Temperature: 710~840
°
C
(2) Bcup-2
(1)
• Chemical Ingredients
(1) •
Cu: About 93%
(1) •
P: 6.8~7.5%
(1) •
The rest: within 0.2%
(1)
• Brazing Temperature: 735~840
°
C
FLUX
(1)
• Ingredients and how to make
• Make amount for only day.
( 1 )
(1) ••
Borax 30%
•
Holding period: 1 day
(1) ••
Borax 35%
• Close the cover of container to prevent dust
(1) •
Fluoridation kalium: 35%
•
putting in the FLUX.
(1) •
Water: 4%
• Keep it in a stainless steel container.
(1) •
Mix the above ingredients and boil until
(1) •
they are transformed into liquid.
DRIER
(1) Assemble the drier within 30min.
• Don't keep the drier in a outdoors because
ASM
(1)
after unpacking.
•
humidity damages to it.
(2) Keep the unpacked drier at the temperature
of 80~100
°
C.
VACUUM
(1) When measuring with pirant Vacuum
• Apply M/C Vacuum Gauge without fail.
(1 )
gauge the charging M/C, vacuum
• Perform vacuum operation until a proper
(1 )
degree is within 1 Torr.
•
vacuum degree is built up.
(2) If the vacuum degree of the cycle inside is
• If a proper vacuum degree isn't built up,
•
(2)
10 Torr. below for low pressure and 20 Torr.
•
check the leakage from
(2)
for high pressure, it says no vacuum
•
the Cycle Pipe line part and
(2)
leakage state.
•
Quick Coupler Connecting part.
(3) Vacuum degree of vacuum pump must be
(3)
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.
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
2
also
(3)
when substituting dry air for Nitrogen Gas.
NIPPLE
(1) Check if gas leaks with soapy water.
• Check if gas leaks from joint of the
AND
(2) Replace Quick Coupler in case of leakage.
•
Coupler.
COUPLER
PIPE
(1)
• Put all Joint Pipes in a clean box and
(1)•
cover tightly with the lid so that dust or
(1)•
humidity is not inserted.
1
2
3
4
5
6
7
DRY AND
AIR
NITROGEN
GAS
AIR
NITROGEN
GAS
▼
General Control of Refrigerating Cycle
