LG LB-D1861 / LB-D2461 / LB-F3061 / LB-F3661 / LB-F3681 / LB-F4261 / LB-E4881 / LB-E6081 / LB-E6084_HL_CL_HP_CP Service Manual ▷ View online
2. Disconnection (on moving)
• Disconnection
(1) Attach the charging hose (manifold gage) to
the service port.
– Connect the manifold gage once to the service
– Connect the manifold gage once to the service
port not stopping. Stopping in the middle of
process may cause the leakage.
process may cause the leakage.
(2) Purge the air in hose into special device such
as retrieving tank opening the valve of
charging- hose (gas side) slightly and then
close it tightly.
charging- hose (gas side) slightly and then
close it tightly.
(3) Operate the air conditioner for 10~15 min until
cycle is stabilized.
(4) Close the spindle of service port (liquid side-
high pressure) and wait till pressure of gas
side (low pressure) drops below 0kgf/cm
side (low pressure) drops below 0kgf/cm
2
.
(5) After the needle of gage indicates below
0 kgf/cm
2
, close the valve of gas side quickly
and turn off the power.
(6) Disconnect the piping between indoor and
outdoor unit and then put on service cap to
the service port.
the service port.
Lo
Outdoor unit
Indoor unit
Liquid side
Gas side
Retrieving Tank
–37–
3. Gas Charging
(After Evacuation)
• Procedure
(1) Connect the charge hose to the charging
cylinder.
– Connect the charge hose which you dis-
– Connect the charge hose which you dis-
connected from the vacuum pump to the valve
at the bottom of the cylinder.
at the bottom of the cylinder.
– If you are using a gas cylinder, also use a scale
and reverse the cylinder so that the system can
be charged in liquid state.
be charged in liquid state.
(2) Purge the air from the charge hose.
– Open the valve at the bottom of the cylinder
and press the check valve on the charge set to
purge the air. (Be careful of the liquid
refrigerant). The procedure is the same if
using a gas cylinder.
purge the air. (Be careful of the liquid
refrigerant). The procedure is the same if
using a gas cylinder.
(3) Open the valve (Lo side on the charge set and
charge the system with liquid refrigerant.
– If the system can not be charged with the
– If the system can not be charged with the
specified amount of refrigerant, it can be
charged with a little at a time (approximately
150g each time) while operating the air
conditioner in the cooling cycle; however, one
time is not sufficient, wait approximately 1
minute and then repeat the procedure.
charged with a little at a time (approximately
150g each time) while operating the air
conditioner in the cooling cycle; however, one
time is not sufficient, wait approximately 1
minute and then repeat the procedure.
(4) Immediately disconnect the charge hose from
the 3-way valve’s service port.
– Stopping par tway will allow the gas to be
– Stopping par tway will allow the gas to be
discharged.
– If the system has been charged with liquid
refrigerant while operating the air conditioner,
turn off the air conditioner before disconnecting
the hose.
turn off the air conditioner before disconnecting
the hose.
(5) Mount the valve stem nuts and the service
port nut.
– Use torque wrench to tighten the service port
– Use torque wrench to tighten the service port
nut to a torque of 1.8 kg.m.
– Be sure to check for gas leakage.
\
This is different from previous procedures.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner.
Lo
Charging
cylinder
cylinder
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
Open
2-Way
valve
valve
3-Way
valve
valve
OPEN
Open
Check valve
(1)
–38–
Cycle Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air and operating current.
Temp. Difference
Temp. difference : approx. 0°C
Current : less than 80% of
Current : less than 80% of
rated current
Temp. difference : approx. 8°C
Current : less than 80% of
Current : less than 80% of
rated current
Temp. difference : less than 8°C
Current : over the rated
Current : over the rated
current
Temp. difference : over 8°C
Operating Current
All amount of refrigerant leaked out
Check refrigeration cycle
Check refrigeration cycle
Refrigerant leakege
Clog of refrigeration cycle
Defective compressor
Clog of refrigeration cycle
Defective compressor
Excessive amount of refrigerant
Normal
Notice :
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.
2. Check temperature and pressure of refrigeration cycle.
Notice :
1. The suction pressure is usually 4.5~6.0 kg/cm
1. The suction pressure is usually 4.5~6.0 kg/cm
2
G at normal condition.
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.
Suction pressure
Temperature
(Compared with
(Compared with
Cause of Trouble
Description
the normal value)
the normal value)
Defective compressor
Current is low
Defective 4-way reverse valve
Excessive amount of
High pressure does not quickly
Normal
refrigerant
rise at the beginning of
operation
operation
Insufficient amount of
Current is low
Lower Higher
refrigerant
(Leakage)
Clogging
Current is low
High
Higher
–39–
Electronic Parts Troubleshooting Guide
: The unit does not operate.
Possible Trouble 1
–40–
YES
NO
YES
Is the input voltage
of transformer AC230V?
Check the FUSE
and the wiring diagram.
and the wiring diagram.
Is the PIN 49,58 of
MICOM. DC5V?
Exchange MICOM.
YES
NO
Check the main P.C.B
pattern.
pattern.
NO
YES
Is the output voltage
of IC03D DC5V?
NO
Exchange IC03D.
Is the input voltage
of IC03D about AC12V?
Check the
5V P.C.B pattern.
5V P.C.B pattern.
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