LG LP-K3060HL Service Manual ▷ View online
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 with liquid.
be charged with liquid.
(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
(pumping down-pin).
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
(pumping down-pin).
(4) Immediately disconnect the charge hose from
the 3-way valve’s service port.
– Stopping partway will allow the gas to be
– Stopping partway 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
3-Way
valve
valve
3-Way
valve
valve
OPEN
Open
Check valve
(1)
–32–
–33–
2) Heating Mode
(After Evacuation)
CLOSE
Lo
OPEN
(1)
Gas side
Liquid side
Indoor unit
Check valve
Charging
cylinder
Outdoor unit
Open
Open
3-Way
valve
3-Way
valve
• Procedure
(1) Connect the charge hose to the charge cylinder.
• Connect the charge hose which you disconnected
from the vacuum pump to the valve at the bottom
of the cylinder.
of the cylinder.
• If you are using a gas cylinder, use a scale and
reverse the cylinder so that the system can be
charged with liquid.
charged with liquid.
(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.
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 specified
• 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 (pumping down-pin).
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 (pumping down-pin).
(4) Immediately disconnect the charge hose from the
3-way valve's service port.
• Stopping partway 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.
off the air conditioner before disconnecting the
hose.
(5) Mount the valve stem nuts and the service port
nut.
- Use a torque wrench to tighten the service port nut.
- Be sure to check 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.
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
Clogging
Current is low
High
Higher
–34–
Electronic Parts Troubleshooting Guide
1) No Cooling operation performed
: The unit does not operate.
Possible Trouble 1
–35–
YES
YES
YES
NO
YES
Is the input voltage
of transformer AC220V?
Is the input voltage
of IC01D DC14V?
Check the FUSE
and the wiring diagram.
and the wiring diagram.
Is the output voltage
of IC01D DC12V?
Is the PIN 55,64 of
MICOM. DC5V?
Exchange MICOM
YES
NO
Check the main P.C.B
pattern
pattern
NO
NO
Check the D02D~D05D
NO
YES
Exchange
the transformer
the transformer
Is shorted the
transformer output?
NO
YES
Is the output voltage
of IC03D DC5V?
NO
Exchange IC01D
Exchange IC03D
Is the output voltage
of transformer about AC14V?
Check the
5V P.C.B pattern.
5V P.C.B pattern.
Possible Trouble 2
: The indoor fan does not operate.
NO
Is IC03M operated
normally?
Check the fan motor
and connector.
(CN-MOTOR)
and connector.
(CN-MOTOR)
YES
Is the each Relay
any problem?
NO
YES
Exchange IC03M
Exchange Relay
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