LG LS-K1862HL 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 additioner gas for air purging has been charged
in the outdoor unit.
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.
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.
- 43 -
Liquid side
Outdoor unit
3-way
valve
valve
Gas side
Indoor unit
2-way
valve
valve
Open
Clsed
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.
the gas leakage from the refrigeration cycle.
CAUTION: Do not leak the gas in the air during Air purging.
• Procedure
(1) Recheck the piping connections.
(2) Open the valve stem of the liquid side valve coun-
terclockwise approximately 90, wait 10 seconds,
and then set it to closed position.
- Be sure to use a hexagonal wrench to operate the
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.
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.
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 liq-
uid 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.
port nut.
Caution
If gas leakage are discovered in step (3) above,
take the following measures:
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
take the following measures:
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
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 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 con-
nect the charge set to the service port of the 3-way
valve.
- Connect the charge hose to the service port.
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
slightily to air purge from the charge hose.
(5) Set the liquid side valve to the closed position.
(6) Operates the air conditioner in cooling mode and
stop it when the gauge indicates 1kg/cm
2
g.
(7) Immediately set the 3-way valve to the closed posi-
tion.
- Do this quickly so that the gauge ends up indicat-
- Do this quickly so that the gauge ends up indicat-
ing 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.
nut.
- Use torque wrench to tighten the service port nut to
a torque of 1.8kg.m.
- Be sure to check for gas leakage.
- 44 -
Lo
Closed
Purge the air
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
Open
2-Way
valve
valve
3-Way
valve
valve
CLOSE
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.
(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.
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
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 the
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 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.
- 45 -
Lo
Closed
OPEN
Closed
Gas cylinder
R22
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
2-Way
valve
valve
3-Way
valve
valve
2) Balance refrigerant of the 2-way, 3-way valves
(Gas leakage)
- 46 -
Lo
Open
Open
3-Way
valve
valve
2-Way
valve
valve
Gas side
CLOSE
OPEN
Outdoor unit
Liquid side
Indoor unit
• 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.
-Connect the charge hose to the service port.
(3) Open the valve (Lo side) on the charge set and dis-
charge the refrigerant until the gauge indicates 0
kg/cm
kg/cm
2
G.
- If there is no air in the refrigerant cycle (the pres-
sure when the air conditioner is not running is high-
er than 1 kg/cm
er than 1 kg/cm
2
G), discharge the refrigerant until
the gauge indicates 0.5 to 1 kg/cm
2
G. if this is the
case, it will not be necessary to apply an evacua-
tion.
tion.
- Discharge the refrigerant gradually; if it is dis-
charged too suddenly, the refrigeration oil will also
be discharged.
be discharged.
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