LG LP-C508T / LP-H508T / LP-Z508T Service Manual ▷ View online
42 Floor Standing Type Air Conditioner
3-way valve
Pumping down
• Procedure
Confirm that both 3-way(liquid side) and 3-way(gas
side) valves are set to the open position.
side) valves are set to the open position.
• Remove the valve stem caps and confirm that the
valve stems are in the raised position.
• Be sure to use a hexagonal wrench to operate the
valve stems.
Operate the unit for 10 to 15 minutes.
Stop operation and wait for 3 minutes, then connect
the charge set to the service port of the 3-way (gas
side) valve.
- Connect the charge hose with the push pin to the
the charge set to the service port of the 3-way (gas
side) valve.
- Connect the charge hose with the push pin to the
service port.
Air purging of the charge hose.
• Open the low-pressure valve on the charge
• Open the low-pressure valve on the charge
equipment slightly to purge air from the charge
hose.
hose.
Set the 3-way(liquid side) valve to the closed
position.
position.
Operate the air conditioner at the cooling cycle and
stop it when the gauge indicates 1 kg/cm
stop it when the gauge indicates 1 kg/cm
2
g
Immediately set the 3-way(gas side) valve to the
closed position.
- Do this quickly so that the gauge ends up indicating
closed position.
- Do this quickly so that the gauge ends up indicating
3 to 5kg/cm
2
g.
Disconnect the charge set, and mount the
3-way(liquid side) and 3-way(gas side) valve's stem
nuts and the service port nut.
3-way(liquid side) and 3-way(gas side) valve's stem
nuts and the service port nut.
- Use torque wrench to tighten the service port nut.
- Be sure to check gas leakage.
- Be sure to check gas leakage.
Lo
CLOSE
CLOSE
Purge the air
Gas side
Liquid side
Indoor unit
Outdoor unit
Closed
Open
3-Way
valve
3-Way
valve
Service Manual 43
3-way valve
• 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.
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.
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.
Check gas leakage.
• Check the flare connections for gas leakage.
• Check the flare connections for gas leakage.
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
44 Floor Standing Type Air Conditioner
3-way valve
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.
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.
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 nec-
essary to apply an evacuation.
- Discharge the refrigerant gradually; if it is discharged too suddenly, the refrigeration oil will also be discharged.
Service Manual 45
3-way valve
CLOSE
Lo
OPEN
Vacuum pump
Gas side
Liquid side
Indoor unit
Outdoor unit
Open
3-Way
valve
Open
3-Way
valve
Evacuation
(All amount of refrigerant leaked)
• Procedure
Connect the vacuum pump to the center hose of charge set.
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).
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).
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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