LG LV-B1861HL Service Manual ▷ View online
1. Air purging
Required tools : hexagonal wrench, adjustable
wrench, torque wrenches, wrench to
hold the joints, and gas leak
detector.
hold the joints, and gas leak
detector.
The additional gas for air purging has been charged
in the outdoor unit.
However, if the flare connections have not been done
correctly and there gas leaks, a gas cylinder and the
charge set will be needed.
in the outdoor unit.
However, if the flare connections have not been done
correctly and there gas leaks, a gas cylinder and the
charge set will be needed.
The air in the indoor unit and in the piping must be
purged. If air remains in the refrigeration pipes, it will
affect the compressor, reduce to cooling capacity, and
could lead to a malfunction.
purged. If air remains in the refrigeration pipes, it will
affect the compressor, reduce to cooling capacity, and
could lead to a malfunction.
• Procedure
(1) Recheck the piping connections.
(2) Open the valve stem of the liquid side valve
counterclockwise approximately 90°, wait 10
seconds, and then set it to closed position.
– Be sure to use a hexagonal wrench to operate
seconds, and then set it to closed position.
– Be sure to use a hexagonal wrench to operate
the valve stem.
(3) Check for gas leakage.
– Check the flare connections for gas leakage.
(4) Purge the air from the system.
– Set the liquid side valve to the open position
and remove the cap from the gas side valve’s
service port.
service port.
– Using the hexagonal wrench to press the valve
core pin, discharge for three seconds and then
wait for one minute. Repeat this three times.
wait for one minute. Repeat this three times.
(5) Use torque wrench to tighten the service port
nut to a torque of 1.8kg.cm.
(6) Set the gas side valve to the back seat.
(7) Mount the valve stem nuts to the gas side and
liquid side valves.
(8) Check for gas leakage.
– At this time, especially check for gas leakage
from the stem nuts of both valves and from the
service port nut.
service port nut.
Caution
If gas leakage are discovered in step (3) above,
take the following mesures :
take the following mesures :
If the gas leaks stop when the piping connections
are tightened further, continue working from step (4).
If the gas leaks do not stop when the connections
are retightened, repair the location of the leak,
discharge all of the gas through the service port,
and then recharge with the specified amount of
gas from a gas cylinder.
are tightened further, continue working from step (4).
If the gas leaks do not stop when the connections
are retightened, repair the location of the leak,
discharge all of the gas through the service port,
and then recharge with the specified amount of
gas from a gas cylinder.
Service port nut.
Be sure, using a torque wrench to tighten the service port nut (after using the service port), so that it prevents the
gas leakage from the refrigeration cycle.
* CAUTION : Do not leak the gas in the air during Air purging.
Be sure, using a torque wrench to tighten the service port nut (after using the service port), so that it prevents the
gas leakage from the refrigeration cycle.
* CAUTION : Do not leak the gas in the air during Air purging.
Liquid side
Outdoor unit
3-way
valve
valve
Gas side
Indoor unit
2-way
valve
valve
Open
Closed
–46–
2. Pumping down
• Procedure
(1) Confirm that both liquid side and gas side
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 to the service port.
the 3-way valve.
– Connect the charge hose 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 liquid side valve to the closed
position.
(6) Operate the air conditioner in cooling mode
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.
Lo
Closed
Purge the air
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
Open
2-Way
valve
valve
3-Way
valve
valve
CLOSE
–47–
1) Re-air purging
(Re-installation)
• Procedure
(1) Confirm that both the liquid side valve and the
gas side 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 liquid side valve approximately 45°
for 3 seconds then closing it for 1 minute;
repeat 3 times.
nut on the 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.
(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.
Lo
Closed
OPEN
Closed
Gas cylinder
R22
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
2-Way
valve
valve
3-Way
valve
valve
–48–
2) Balance refrigerant of the 2-way, 3-way valves
(Gas leakage)
• Procedure
(1) Confirm that both the liquid side and gas side
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 to the service port.
– Leave the valve on the charge set closed.
– Connect the charge hose 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.
Lo
Open
Open
3-Way
valve
valve
2-Way
valve
valve
Gas side
CLOSE
OPEN
Outdoor unit
Liquid side
Indoor unit
–49–
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