LG LS-J0961HL Service Manual ▷ View online
2. Pumping down
• Procedure
(1) Confirm that both the 2-way and 3-way valves
are set to the open position.
– Remove the valve stem caps and confirm that
– 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.
(2) Operate the unit for 10 to 15 minutes.
(3) Stop operation and wait for 3 minutes, then
connect the charge set to the service port of
the 3-way valve.
– Connect the charge hose with the push pin to
the 3-way valve.
– Connect the charge hose with the push pin to
the service port.
(4) Air purging of the charge hose.
– Open the low-pressure valve on the charge set
slightly to air purge from the charge hose.
(5) Set the 2-way valve to the closed position.
(6) Operate the air conditioner at the cooling
cycle and stop it when the gauge indicates
1kg/cm
1kg/cm
2
g.
(7) Immediately set the 3-way valve to the closed
position.
– Do this quickly so that the gauge ends up
– Do this quickly so that the gauge ends up
indicating 3 to 5kg/cm
2
g.
(8) Disconnect the charge set, and mount the 2-
way and 3-way valve’s stem nuts and the
service port nut.
– Use torque wrench to tighten the service port
service port nut.
– Use torque wrench to tighten the service port
nut to a torque of 1.8 kg.m.
– Be sure to check for gas leakage.
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1) Re-air purging
(Re-installation)
• Procedure
(1) Confirm that both the 2-way valve and the 3-
way valve are set to the closed position.
(2) Connect the charge set and a gas cylinder to
the service port of the 3-way valve.
– Leave the valve on the gas cylinder closed.
– Leave the valve on the gas cylinder closed.
(3) Air purging.
– Open the valves on the gas cylinder and the
charge set. Purge the air by loosening the flare
nut on the 2-way valve approximately 45° for 3
seconds then closing it for 1 minute; repeat 3
times.
nut on the 2-way 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 the 2-way valve.
(4) Check for gas leakage.
– Check the flare connections for gas leakage.
(5) Discharge the refrigerant.
– Close the valve on the gas cylinder and
discharge the refrigerant until the gauge
indicates 3 to 5 kg/cm
indicates 3 to 5 kg/cm
2
g.
(6) Disconnect the charge set and the gas
cylinder, and set the 2-way and 3-way valves
to the open position.
– Be sure to use a hexagonal wrench to operate
to the open position.
– Be sure to use a hexagonal wrench to operate
the valve stems.
(7) 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.
* CAUTION:
Do not leak the gas in the air during Air
Purging.
Purging.
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2) Balance refrigerant of the 2-way, 3-way valves
(Gas leakage)
• Procedure
(1) Confirm that both the 2-way and 3-way valves
are set to the back seat.
(2) Connect the charge set to the 3-way valve’s
port.
– Leave the valve on the charge set closed.
– Connect the charge hose with the push pin to
– Leave the valve on the charge set closed.
– Connect the charge hose with the push pin to
the service port.
(3) Open the valve (Lo side) on the charge set
and discharge the refrigerant until the gauge
indicates 0 kg/cm
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
running is higher than 1 kg/cm
2
G), discharge
the refrigerant until the gauge indicates 0.5 to 1
kg/cm
kg/cm
2
G. if this is the case, it will not be
necessary to apply a evacuatin.
– Discharge the refrigerant gradually; if it is
discharged too suddenly, the refrigeration oil
will also be discharged.
will also be discharged.
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3. Evacuation
(All amount of refrigerant leaked)
• Procedure
(1) Connect the vacuum pump to the charge set’s
center hose
(2) Evacuation for approximately one hour.
– Confirm that the gauge needle has moved
toward -76 cmHg (vacuum of 4 mmHg or less).
(3) Close the valve (Lo side) on the charge set,
turn off the vacuum pump, and confirm that
the gauge needle does not move (approxima-
tely 5 minutes after turning off the vacuum
pump).
the gauge needle does not move (approxima-
tely 5 minutes after turning off the vacuum
pump).
(4) Disconnect the charge hose from the vacuum
pump.
– Vacuum pump oil.
– Vacuum pump oil.
If the vacuum pump oil becomes dirty or
depleted, replenish as needed.
depleted, replenish as needed.
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