LG LP-F8081ZL Service Manual ▷ View online
7.3 Evacuation
(All amount of refrigerant leaked)
• Procedure
¤
Connect the vacuum pump to the center hose of charge set.
¤Ł
Evacuation for approximately one hour.
- Confirm that the gauge needle has moved toward -76cmHg (vacuum of 4 mmHg or less).
- Confirm that the gauge needle has moved toward -76cmHg (vacuum of 4 mmHg or less).
¤Ø
Close the valve (Lo side) on the charge set, turn off the vacuum pump, and confirm that the gauge needle
does not move (approximately 5 minutes after turning off the vacuum pump).
does not move (approximately 5 minutes after turning off the vacuum pump).
¤Œ
Disconnect the charge hose from the vacuum pump.
- Vacuum pump oil.
If the vacuum pump oil gets dirty or depleted, replenish as needed.
CLOSE
Lo
OPEN
Vacuum pump
Gas side
Liquid side
Indoor unit
Outdoor unit
Open
3-Way
valve
Open
3-Way
valve
–36–
7.4 Gas Charging
1) Cooling mode
(After Evacuation)
• 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.
¤Ł
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.
¤Ø
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
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 approximately 1 minute and then repeat the
procedure (pumping down-pin).
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).
¤Œ
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.
¤º
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.
• 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.
CLOSE
Lo
OPEN
(1)
Gas side
Check valve
Charging
cylinder
Liquid side
Indoor unit
Outdoor unit
Open
3-Way
valve
Open
3-Way
valve
–37–
–38–
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.
¤Ł
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.
¤Ø
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
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 approximately 1 minute and then repeat the
procedure (pumping down-pin).
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).
¤Œ
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
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.
¤º
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.
8. Troubleshooting Guide
–39–
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
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.
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