LG LM-3060HL Service Manual ▷ View online
3 Re-air purging
(Re-installation)
• Procedure
(1) Confrim that both the liquid side valve and the gas
side vale are set to the closed position.
(2) Connecty the center hose of the gauge and a gas
cylinder. Connect the hose of the hi pressure side
and the service port of the liquid side valve.
- Leave the valve on the gas cylinder closed.
and the service port of the liquid side valve.
- Leave the valve on the gas cylinder closed.
(3) Check for gas leakage.
- Open the valves on the gas cylinder and the
hi-handle of the gauge, wait 10 seconds, and then
set them to closed position.
set them to closed position.
- Check the flare connections for gas leakage.
(4) Air purging
- Open teh valves on the gas cylinder and the hi-
handle of the gauge.
- Use the Hexagonal wrench to press the gas side
valve's core pin, discharge for three seconds and
then wait for one minute. Repeat this three times.
then wait for one minute. Repeat this three times.
(5) Discharge the refrigerant.
- Close the valve on the gas cylinder and discharge
the refrigerant until the gauge indicates
0.5 to 1kg/cm
0.5 to 1kg/cm
2
G.
(6) Disconnect the gauge and the gas cylinder.
(7) Apply steps from 1 to 6 to each (A-unit, B-unit, C-
unit) by the same method.
(8) Set the both liquid and gas side vales to open
position with the Hexagonal wrench for the unit
operation.
operation.
(9) Mount the valve caps and the service port caps.
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Indoor unit
Liquid side
Outdoor unit
Closed
3-way
valve
valve
3-way
valve
valve
Closed
Gas side
Gas cylinder
manifold gauge
R22
Low-handle
(CLOSE)
(CLOSE)
Hi-handel
(OPEN)
(OPEN)
Caution
Remember that ourdoor unit does not contain the
refrigerant for air purge when you purge the air,
you should charge your refrigerant (or purchased) by
use of the gas cylinder and the manifold gauge.
refrigerant for air purge when you purge the air,
you should charge your refrigerant (or purchased) by
use of the gas cylinder and the manifold gauge.
If gas leakage are discovered in step 3 above, take
the following measure:
the following measure:
If the gas leaks top 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.
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.
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• Procedure
(1) Confirm that both the liquid side and gas side
valves are set to the back seat.
(2) Connect the manifold gauge to the liquid side
valve's port.
- Leave teh valve on the gauge close.
- Connect the hose of the gauge with the push pin to
- Leave teh valve on the gauge close.
- Connect the hose of the gauge with the push pin to
the service port.
(3) Open the valve on the manifold gauge and
discharge the refrigerant until the gauge indicates
0kg/cm
0kg/cm
2
G.
- If there is no air in the refrigerant cycle (the running
is higher than 1kg/cm
2
G), discharge the refrigerant
until the gauge indicate 0.5 to 1kg/cm
2
G. If this is
the case, it will not be mecessary to apply a
evacuation.
evacuation.
- Discharge the refrigerant gradually; If it is
discharged too suddenly, the refrigerant oil will also
be discharged.
be discharged.
Indoor unit
Liquid side
Outdoor unit
Open
3-way
valve
valve
3-way
valve
valve
Open
Gas side
manifold gauge
Low-handle
(OPEN)
(OPEN)
Hi-handle
(CLOSE)
(CLOSE)
4. Balance refrigerant fo the liquid side, gas side valves.
(Gas leakage)
5. Evacuation
(All amount of refrigerant leakage)
• Procedure
(1) Confirm that both the liquid side valve and gas side
vale are set to the opened position.
(2) Connect the vacuum pump and the center hose of
the manifold gauge.
(3) Connect the service port of the gas side valve to
the low side of the gauge.
(4) Evacution for approximately one hour.
- Confrim that the gauge needle has moved toward
-76cmHG(vacuum of 4mmHG or less)
(5) Close the Low-handle of thegauge turn off the vac-
uum pump, and confirm that the gauge needle does
not move (approximately 5minutes after turning off
the vacuum pump).
not move (approximately 5minutes after turning off
the vacuum pump).
(6) Disconnect the vacuum pump from the gauge.
- Vacuum pump oil.
If the vacuum pump oil becomes dirty of depleted,
replenish as needed.
replenish as needed.
(7) Mount the valve caps and the service port caps.
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Vacuum pump
Indoor unit
Liquid side
Outdoor unit
Open
3-way
valve
valve
3-way
valve
valve
Open
Gas side
manifold gauge
Low-handle
(OPEN)
(OPEN)
Hi-handle
(CLOSE)
(CLOSE)
6. Gas Charging
(After Evacuation)
• Procedure
(1) Connec6t the gauge 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 revers the cylinder so that the system can be
charged with liquid.
charged with liquid.
(2) Purge teh air from the charge hose.
- Open the valve at the bottom of teh cylinder and
presst eh check vavlvve on the manifold gauge to
purge the air. (Be careful of the liquid refrigerant).
The procedure is the same if using a gas cylinder.
purge the air. (Be careful of the liquid refrigerant).
The procedure is the same if using a gas cylinder.
(3) Open the low handle on the gauge and charge the
system with liquid refrigerant.
- If the system can not be charged with the speciried
- If the system can not be charged with the speciried
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
approximately 1 minute and then repeat the proce-
dure (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
approximately 1 minute and then repeat the proce-
dure (pumping down-pin).
(4) Immediately disconnect the charge hose from the
gas side valve's service port.
- Stopping partway will allow the gas to be
- Stopping partway will allow the gas to be
discharged.
- If the system has been charged with liquid
refrigerant while operating the air conditioner turn
off the air conditioner before disconnecting the
hose.
off the air conditioner before disconnecting the
hose.
(5) Mount the valve stem nuts andthe service port nut.
- Use torque wrench to tighten theservice port nut to
a torque of 1.8Kg.m. (4.2 kg.m/ 5.5 kg.m)
- Be sure to check for gas leakage.
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This is different from previous procedures.
Because you are charging with liquid refrigerant 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 refrigerant from
the gas side, absolutely do not attempt to charge with
larger amounts of liquid refrigerant while operating
the air conditioner.
Caution
In heating operation mode, charge the gas after
operating the cooling mode.
operating the cooling mode.
Charging
cylinder
cylinder
Check valve
Indoor unit
Liquid side
Outdoor unit
Open
3-way
valve
valve
3-way
valve
valve
Open
Gas side
Manifold gauge
Low-handle
(OPEN)
(OPEN)
Hi-handle
(CLOSE)
(CLOSE)
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