LG LS-K1863HL_HM_HN / LS-K1864HL_HM_HN_BL_EL / LS-K1867HL_HM_HN / LS-K2423HL_HM_HN / LS-K2424HL_HM_HN / LS-K2465HL_HM_HN / LS-K2466HL_HM_HN_BL_EL / LS-K2665HL_HM_HN / LS-K2666HL_HM_HN_BL_EL / LS-K2669HL_HM_HN Service Manual ▷ View online
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.
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.
- 47 -
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)
- 48 -
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.
3. Evacuation
(All amount of refrigerant leaked)
• Procedure
(1) Connect the vacuum pump to the center hose of
charge set center hose
(2) Evacuation for approximately one hour.
- Confirm that the gauge needle has moved
toward -76cmHg (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 nee-
dle does not move (approximately 5 minutes after
turning off the vacuum pump).
dle does not move (approximately 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.
replenish as needed.
- 49 -
Lo
Open
Open
Vacuum pump
2-Way
valve
valve
Outdoor unit
Liquid side
Indoor unit
Gas side
3-Way
valve
valve
CLOSE
OPEN
4. Gas Charging
(After Evacuation)
• Procedure
(1) 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, also use a scale and
reverse the cylinder so that the system can be
charged with liquid.
charged with liquid.
(2) 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.
(3) 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
- 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 approxi-
mately 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 approxi-
mately 1 minute and then repeat the procedure
(pumping down-pin).
(4) Immediately disconnect the charge hose from the
3-way valve's service port.
- Stopping partway will allow the gas to be dis-
charged.
- If the system has been charged with liquid refriger-
ant while operating the air conditioner turn off the
air conditioner before disconnecting the hose.
air conditioner before disconnecting the hose.
(5) 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.
- 50 -
Lo
Charging
cylinder
cylinder
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
Open
2-Way
valve
valve
3-Way
valve
valve
OPEN
Open
Check valve
(1)
This is different from previous procedures.
Because you are charging with liquid refriger-
ant 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 refriger-
ant 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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