LG LP-E5082HL Service Manual ▷ View online
– 58 –
• Procedure
¤
Confirm that both the 3-way (liquid side) valve and
the 3-way(gas side) valve are set to the closed
position.
the 3-way(gas side) valve are set to the closed
position.
¤Ł
Connect the charge set and a gas cylinder to the
service port of the 3-way(gas side) valve.
• Leave the valve on the gas cylinder closed.
• Leave the valve on the gas cylinder closed.
¤Ø
Air purging.
• Open the valves on the gas cylinder and the charge
set. Purge the air by loosening the flare nut on the
3-way(liquid side) valve approximately 45° for 3
seconds then closing it for 1 minute; repeat 3 times.
3-way(liquid side) valve approximately 45° for 3
seconds then closing it for 1 minute; repeat 3 times.
• After purging the air, use a torque wrench to tighten
the flare nut on liquid side valve.
¤Œ
Check gas leakage.
• Check the flare connections for gas leakage.
• Check the flare connections for gas leakage.
¤º
Discharge the refrigerant.
• Close the valve on the gas cylinder and discharge
• Close the valve on the gas cylinder and discharge
the refrigerant until the gauge indicates 3 to
5kg/cm
5kg/cm
2
g
¤
Disconnect the charge set and the gas cylinder,
and set the 3-way(liquid side) and 3-way(gas side)
valves to the open position.
• Be sure to use a hexagonal wrench to operate the
and set the 3-way(liquid side) and 3-way(gas side)
valves to the open position.
• Be sure to use a hexagonal wrench to operate the
valve stems.
¤
Mount the valve stem nuts and the service port nut.
• Use torque wrench to tighten the service port nut.
• Be sure to check gas leakage.
1) Re-air purging
(Re-installation)
CLOSE
OPEN
R22
Gas side
Gas cylinder
Liquid side
Indoor unit
Outdoor unit
Closed
3-Way
valve
Closed
3-Way
valve
– 59 –
CLOSE
OPEN
Gas side
Liquid side
Indoor unit
Outdoor unit
Open
Open
3-Way
valve
3-Way
valve
2) Balance refrigerant of the 3-way(liquid side), 3-way(gas side) valves
(Gas leakage)
• Procedure
¤
Confirm that both the liquid side and gas side valves are set to the back seat.
¤Ł
Connect the charge set to the 3-way(gas side) valve's port.
• Leave the valve on the charge set closed.
• Connect the charge hose with the push pin to the service port.
• Connect the charge hose with the push pin to the service port.
¤Ø
Open the valve (Lo side) on the charge set and discharge the refrigerant until the gauge indicates 0 kg/cm
2
g.
- If there is no air in the refrigerant cycle (the pressure when the air conditioner is not running is higher than 1
kg/cm
2
g), discharge the refrigerant until the gauge indicates 0.5 to 1 kg/cm
2
g. In case of this, it will not be
necessary to apply an evacuation.
- Discharge the refrigerant gradually; if it is discharged too suddenly, the refrigeration oil will also be discharged.
– 60 –
CLOSE
Lo
OPEN
Vacuum pump
Gas side
Liquid side
Indoor unit
Outdoor unit
Open
3-Way
valve
Open
3-Way
valve
8.3
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.
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8.4 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.
¤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 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
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).
¤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.
• 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.
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