LG LP-C508T / LP-H508T / LP-Z508T Service Manual ▷ View online
46 Floor Standing Type Air Conditioner
3-way valve
Gas Charging
1) Cooling mode
(After Evacuation)
CLOSE
Lo
OPEN
(1)
Gas side
Check valve
Charging
cylinder
Liquid side
Indoor unit
Outdoor unit
Open
3-Way
valve
Open
3-Way
valve
• Procedure
Connect the charge hose to the charging 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.
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.
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
charge the system with liquid refrigerant.
• 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 approxi-
mately 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 approxi-
mately 1 minute and then repeat the procedure
(pumping down-pin).
Immediately disconnect the charge hose from the
3-way(gas side) 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.
off the air conditioner before disconnecting the
hose.
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.
• 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.
Service Manual 47
3-way valve
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
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.
Purge the air from the charge hose.
• Open the valve at the bottom of the cylinder and
• 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.
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
charge the system with liquid refrigerant.
• 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 approxi-
mately 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 approxi-
mately 1 minute and then repeat the procedure
(pumping down-pin).
Immediately disconnect the charge hose from the
3-way valve's service port.
3-way valve's service port.
• Stopping partway will allow the gas to be dis-
charged.
• If the system has been charged with liquid refriger-
ant while operating the air conditioner turn off the
air conditioner before disconnecting the hose.
air conditioner before disconnecting the hose.
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.
48 Floor Standing Type Air Conditioner
Troubleshooting guide
In general, possible trouble is classified as two causes.
The one is so called Starting Failure which is caused from an electrical defect, and the other is Ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.
The one is so called Starting Failure which is caused from an electrical defect, and the other is Ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.
Unit runs but ineffective cooling
– 48 –
Ineffective Cooling or Heating
Check outdoor coil
(heat exchanger) & fan
operation.
(heat exchanger) & fan
operation.
Check gas leakage.
Repair gas leak.
Replacement of unit if the
unit is beyond repair.
unit is beyond repair.
Satisfactory operation with
temperature difference of
inlet & outlet air ;
COOLING : 7~10
temperature difference of
inlet & outlet air ;
COOLING : 7~10
°
C
HEATING : 15~17
°
C
Check heat load rise at
cooling operation.
cooling operation.
Unexpected residue
Added electrical utensil
Check inside gas
pressure.
pressure.
Adjust refrigerant
charge.
charge.
Malfunction of compressor.
Replacement of
compressor
compressor
Check of cold (warm) air cir-
culation for smooth flow.
culation for smooth flow.
Dirty indoor coil
(heat exchanger.)
(heat exchanger.)
Malfunction of fan.
Clogging of air filter.
Obstruction at air outlet.
Stop of auto air-swing.
Countermeasure against
above trouble.
above trouble.
Check clogging in refrigera-
tion circuit.
tion circuit.
Repair clogging in refrigera-
tion circuit.
tion circuit.
Troubleshooting guide
Service Manual 49
Troubleshooting guide
Failures to Start
Check of circuit breaker
and fuse.
and fuse.
Check control switch.
Fan only fails to start
Improper wiring
Defect of fan motor
capacitor.
capacitor.
Irregular motor
resistance
resistance
(
Ω
)
Irregular motor
insulation
insulation
(
Ω
)
Replacement of fan motor.
Improper electric heater
Replacement of electric
heater
heater
Regular but fails to start.
Replacement of compressor
Electric heater is not energized
Loose terminal connection.
Improper wiring
Irregular motor resistance
(
Ω
)
Irregular motor insulation
(
Ω
)
Replacement of compressor
Drop of power voltage
Capacitor check
Replacement
Compressor only fails to
start
start
Defect of compressor
capacitor
capacitor
Check power source.
Check control switch
setting.
setting.
Click on the first or last page to see other LP-C508T / LP-H508T / LP-Z508T service manuals if exist.