LG LM-1860HL Service Manual ▷ View online
2. Pumping down
•
Procedure
(1) Confirm that both the gas side and liquid 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
connect the charge set to the service port of the
gas side valve.
gas side 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 hose.
(5) Set the liquid side valve to the closed position.
(6) Operate the air conditioner at the cooling cycle
and stop it when the gauge indicates 1kg/cm
2
g.
(7) Immediately set the gas side valve to the closed
position.
- Do this quickly so that the gauge ends up indi-
cating 3 to 5kg/cm
2
g.
(8) Disconnect the charge set, and mount the liquid
side and gas side valve's stem nuts and the ser-
vice port nut.
vice port nut.
- Use torque wrench to tighten the service port
nut to a torque of 1.8kg.m.
- Be sure to check for gas leakage.
(9) Apply steps from (1) to (8) to each unit (A-unit,
B-unit) by the same method.
- 43 -
Lo
Indoor unit
Liquid side
Outdoor unit
Close
2-Way
valve
3-Way
valve
Open
Gas side
CLOSE
CLOSE
Purge the air
3. 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 liquid side valve.
- Leave the valve on the gas cylinder closed.
(3) Air purging.
- Open the vlaves on the gas cylinder and the
charge set.
- Using the Hexagonal wrench to press the ges
side valve's core pin, discharge for three
seconds and then wait for one minute.
seconds and then wait for one minute.
Repeat this three Times.
(4) Check for gas leakage.
- Check the flare connections for gas leakage.
(5) Discharge the refrigerant.
- Close the valve on the gas cylinder and dis-
charge the refrigerant until the gauge indicates
3 to 5kg/
3 to 5kg/
c m
2
G.
(6) Disconnect the charge set and the gas cylinder,
and set the liquid side and gas side valves to
the open position.
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
nut to a torque of 1.8kg.m.
- Be sure to check for gas leakage.
(8) Apply steps from (1) to (8) to each (A-unit, B-
unit) by the same method.
- 44 -
Lo
R22
Indoor unit
Liquid side
Outdoor unit
Closed
3-Way
valve
valve
3-Way
valve
valve
Closed
Gas side
Gas cylindel
R22
CLOSE
CLOSE
4. Balance refrigerant of the liquid side, gas side valves
(Gas leakage)
- 45 -
Lo
• 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 gas side valve's
port.
- Leave the valve on the charge set closed.
- Connect the charge hose with the push pin to
- 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 indi-
cates 0 kg/cm
cates 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 refrig-
erant until the gauge indicates 0.5 to 1kg/cm
2
.G.
if this is the case, it will not be necessary to
apply a evacuation.
apply a evacuation.
- Discharge the refrigerant gradually; if it is dis-
charged too suddenly, the refrigeration oil will
also be discharged.
also be discharged.
(4) Apply steps from (1) to (3) to each unit (A-unit,
B-unit) by the same method.
Indoor unit
Liquid side
Outdoor unit
Open
2-Way
valve
3-Way
valve
Open
Gas side
CLOSE
OPEN
5. 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 (approximately 5
minutes after turning off the vacuum pump).
gauge needle does not move (approximately 5
minutes after turning off the vacuum pump).
(4) Disconnect the vaccum pump from the vacuum
pump.
- Vacuum pump oil.
If the vacuum pump oil becomes dirty or deplet-
ed,replenish as needed.
ed,replenish as needed.
(5) Apply steps from (1) to (4) to each (A-unit, B-
unit) by the same method.
- 46 -
Lo
Indoor unit
Liquid side
Outdoor unit
Close
3-Way
valve
3-Way
valve
Open
Gas side
CLOSE
OPEN
Vacuum pump
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