LG LS-M3060HL / LS-M3060CL / LS-M3061HL / LS-M3061CL / LS-M3064HL / LS-M3064CL / LS-M3221HL / LS-M3221CL / LS-N3660HL / LS-N3660CL / LS-N3661HL / LS-N3661CL / LS-N3821HL / LS-N3821CL Service Manual ▷ View online
- 34 -
2) Form the piping
1. Form the piping by wrapping the connecting por-
tion of the indoor unit with insulation material and
secure it with two kinds of vinyl tapes.
secure it with two kinds of vinyl tapes.
■
If you want to connect an additional drain hose,
the end of the drain outlet should be routed above
the ground. Secure the drain hose appropriately.
the end of the drain outlet should be routed above
the ground. Secure the drain hose appropriately.
2. In cases where the outdoor unit is installed below
the indoor unit perform the following.
■
Tape the piping, drain hose and connecting cable
from down to up.
from down to up.
■
Secure the tapped piping along the exterior wall
using saddle or equivalent.
using saddle or equivalent.
3. In cases where the Outdoor unit is installed above
the Indoor unit perform the following.
■
Tape the piping and connecting cable from down
to up.
to up.
■
Secure the taped piping along the exterior wall.
Form a trap to prevent water entering the room.
Form a trap to prevent water entering the room.
■
Fix the piping onto the wall by saddle or equiva-
lent.
lent.
;;
;;
Taping
Drain
hose
Pipings
Connecting
cable
Trap is required to prevent water
from entering into electrical parts.
from entering into electrical parts.
Seal small openings
around pipings with a
gum type sealer.
around pipings with a
gum type sealer.
Trap is required to prevent water from entering
into electrical parts.
into electrical parts.
Seal a small opening
around the pipings
with gum type sealer.
around the pipings
with gum type sealer.
Drain hose
Taping
Pipings
Connecting
cable
cable
Power supply
cord
cord
;;
;;
Seal a small opening
around the pipings
with gum type sealer.
around the pipings
with gum type sealer.
Trap
Trap
Seal a small opening
around the pipings
with gum type sealer.
around the pipings
with gum type sealer.
Trap
Trap
30K, 32K
36K, 38K
30K, 32K
36K, 38K
- 35 -
4. AIR PURGING
1) Air purging
Air and moisture remaining in the refrigerant system
have undesirable effects as indicated below.
have undesirable effects as indicated below.
■
Pressure in the system rises.
■
Operating current rises.
■
Cooling(or heating) efficiency drops.
■
Moisture in the refrigerant circuit may freeze and
block capillary tubing.
block capillary tubing.
■
Water may lead to corrosion of parts in the refrig-
eration system.
eration system.
Therefore, the indoor unit and tubing between the
indoor and outdoor unit must be leak tested and
evacuated to remove any noncondensables and
moisture from the system.
indoor and outdoor unit must be leak tested and
evacuated to remove any noncondensables and
moisture from the system.
2) Air purging with vacuum pump
1. Preparation
■
Check that each tube(both liquid and gas side
tubes) between the indoor and outdoor units have
been properly connected and all wiring for the test
run has been completed. Remove the service
valve caps from both the gas and the liquid side
on the outdoor unit. Note that both the liquid and
the gas side service valves on the outdoor unit
are kept closed at this stage.
tubes) between the indoor and outdoor units have
been properly connected and all wiring for the test
run has been completed. Remove the service
valve caps from both the gas and the liquid side
on the outdoor unit. Note that both the liquid and
the gas side service valves on the outdoor unit
are kept closed at this stage.
2. Leak test
■
Connect the manifold valve(with pressure gauges)
and dry nitrogen gas cylinder to this service port
with charge hoses.
and dry nitrogen gas cylinder to this service port
with charge hoses.
■
Pressurize the system to no more than 150 P.S.I.G.
with dry nitrogen gas and close the cylinder valve
when the gauge reading reached 150 P.S.I.G.
Next, test for leaks with liquid soap.
with dry nitrogen gas and close the cylinder valve
when the gauge reading reached 150 P.S.I.G.
Next, test for leaks with liquid soap.
■
Do a leak test of all joints of the tubing(both indoor
and outdoor) and both gas and liquid side service
valves.
Bubbles indicate a leak. Be sure to wipe off the
soap with a clean cloth.
and outdoor) and both gas and liquid side service
valves.
Bubbles indicate a leak. Be sure to wipe off the
soap with a clean cloth.
■
After the system is found to be free of leaks,
relieve the nitrogen pressure by loosening the
charge hose connector at the nitrogen cylinder.
When the system pressure is reduced to normal,
disconnect the hose from the cylinder.
relieve the nitrogen pressure by loosening the
charge hose connector at the nitrogen cylinder.
When the system pressure is reduced to normal,
disconnect the hose from the cylinder.
Be sure to use a manifold valve for air purging. If it is not
available, use a stop valve for this purpose. The "Hi"
knob of the manifold valve must always be kept close.
available, use a stop valve for this purpose. The "Hi"
knob of the manifold valve must always be kept close.
CAUTION
To avoid nitrogen entering the refrigerant system in a
liquid state, the top of the cylinder must be higher than
its bottom when you pressurize the system. Usually,
the cylinder is used in a vertical standing position.
liquid state, the top of the cylinder must be higher than
its bottom when you pressurize the system. Usually,
the cylinder is used in a vertical standing position.
CAUTION
Lo
Hi
Indoor unit
Indoor unit
Outdoor unit
Outdoor unit
Manifold valve
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
cylinder(in vertical
standing position)
Pressure
gauge
gauge
30K, 32K
36K, 38K
- 36 -
3. Evacuation
■
Connect the charge hose end described in the
preceding steps to the vacuum pump to evacuate
the tubing and indoor unit.
Confirm the "Lo" knob of the manifold valve is
open. Then, run the vacuum pump.
The operation time for evacuation varies with tubing
length and capacity of the pump. The following
table shows the time required for evacuation.
preceding steps to the vacuum pump to evacuate
the tubing and indoor unit.
Confirm the "Lo" knob of the manifold valve is
open. Then, run the vacuum pump.
The operation time for evacuation varies with tubing
length and capacity of the pump. The following
table shows the time required for evacuation.
■
When the desired vacuum is reached, close the
"Lo" knob of the manifold valve and stop the
vacuum pump.
"Lo" knob of the manifold valve and stop the
vacuum pump.
4. Finishing the job
■
With a service valve wrench, turn the valve stem
of liquid side valve counter-clockwise to fully
open the valve.
of liquid side valve counter-clockwise to fully
open the valve.
■
Turn the valve stem of gas side valve
counter-clockwise to fully open the valve.
counter-clockwise to fully open the valve.
■
Loosen the charge hose connected to the gas
side service port slightly to release the pressure,
then remove the hose.
side service port slightly to release the pressure,
then remove the hose.
■
Replace the flare nut and its bonnet on the gas
side service port and fasten the flare nut securely
with an adjustable wrench. This process is very
important to prevent leakage from the system.
side service port and fasten the flare nut securely
with an adjustable wrench. This process is very
important to prevent leakage from the system.
■
Replace the valve caps at both gas and liquid
side service valves and fasten them tight.
This completes air purging with a vacuum pump.
The air conditioner is now ready to test run.
side service valves and fasten them tight.
This completes air purging with a vacuum pump.
The air conditioner is now ready to test run.
(1) Remove the caps from the gas side and liquid side valves.
(2) Remove the service-port cap from the gas side valve.
(3) To open the gas side valve turn the valve stem counter-
(2) Remove the service-port cap from the gas side valve.
(3) To open the gas side valve turn the valve stem counter-
clockwise approximately 90°, wait for about 2~3 sec, and
close it.
close it.
(4) Apply a soap water or a liquid neutral detergent on the
indoor unit connection or outdoor unit connections by a
soft brush to check for leakage of the connecting points of
the piping.
soft brush to check for leakage of the connecting points of
the piping.
(5) If bubbles come out, the pipes have leakage.
Soap water method
Gas side
Liquid side
Cap
Hexagonal wrench
3-way valve
(Open)
3-way valve
(Close)
Required time for evacuation
when 30 gal/h vacuum pump is used
10 min. or more
15 min. or more
If tubing length is less
than 10m (33 ft).
If tubing length is longer
than 10m (33 ft).
Indoor unit
Outdoor unit
Lo
Hi
Manifold valve
Vacuum pump
Pressure
gauge
gauge
Open
Close
Indoor unit
Outdoor unit
30K, 32K
36K, 38K
- 37 -
5. TEST RUNNING
1. Check that all tubing and wiring have been prop-
erly connected.
2. Check that the gas and liquid side service valves
are fully open.
1. Prepare remote control
Remove the battery cover
by pulling it according to the
arrow direction.
Insert new batteries making
sure that the (+) and (–) of
battery are installed correctly.
Reattach the cover by
pushing it back into position.
by pulling it according to the
arrow direction.
Insert new batteries making
sure that the (+) and (–) of
battery are installed correctly.
Reattach the cover by
pushing it back into position.
NOTE:
• Use 2 AAA(1.5volt) batteries. Do not use
rechargeable batteries.
• Remove the batteries from the remote control if
the system is not going to be used for a long time.
2. Settlement of outdoor unit
■
Anchor the outdoor unit with a bolt and
nut(ø10mm) tightly and horizontally on a concrete
or rigid mount.
nut(ø10mm) tightly and horizontally on a concrete
or rigid mount.
■
When installing on the wall, roof or rooftop, anchor
the mounting base securely with a nail or wire
assuming the influence of wind and earthquake.
the mounting base securely with a nail or wire
assuming the influence of wind and earthquake.
■
In the case when the vibration of the unit is con-
veyed to the hose, secure the unit with an
anti-vibration rubber.
veyed to the hose, secure the unit with an
anti-vibration rubber.
3. Evaluation of the performance
Operate unit for 15~20 minutes, then check the sys-
tem refrigerant charge:
tem refrigerant charge:
1. Measure the pressure of the gas side service
valve.
2. Measure the temperature of the intake and dis-
charge of air.
NOTE: If the actual pressure are higher than shown,
the system is most likely over-charged, and
charge should be removed. If the actual pres-
sure are lower than shown, the system is most
likely undercharged, and charge should be
added.
The air conditioner is now ready for use.
charge should be removed. If the actual pres-
sure are lower than shown, the system is most
likely undercharged, and charge should be
added.
The air conditioner is now ready for use.
Bolt
Tubing connection
Outside ambient TEMP The pressure of the gas side service valve
35°C(95°F)
4~5kg/cm
2
G(56.8~71.0 P.S.I.G.)
This is performed when the unit is to be relocated
or the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant in the out-
door unit without loss in refrigerant gas.
or the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant in the out-
door unit without loss in refrigerant gas.
CAUTION:
Be sure to perform Pump Down procedure with the
unit cooling mode.
Be sure to perform Pump Down procedure with the
unit cooling mode.
Pump Down Procedure
1. Connect a low-pressure gauge manifold hose to the
1. Connect a low-pressure gauge manifold hose to the
charge port on the gas side service valve.
2. Open the gas side service valve halfway and purge the
air from the manifold hose using the refrigerant gas.
3. Close the liquid side service valve(all the way in).
4. Turn on the unit's operating switch and start the cool-
4. Turn on the unit's operating switch and start the cool-
ing operation.
5. When the low-pressure gauge reading becomes 1 to
0.5kg/cm
2
G(14.2 to 7.1 P.S.I.G.), fully close the gas
side valve stem and then quickly turn off the unit. At
that time, Pump Down has been completed and all
refrigerant gas will have been collected in the outdoor
unit.
that time, Pump Down has been completed and all
refrigerant gas will have been collected in the outdoor
unit.
PUMP DOWN
3. Ensure the difference between the intake temper-
ature and the discharge is more than 8°C
(Cooling) or reversely (Heating).
(Cooling) or reversely (Heating).
4. For reference; the gas side pressure of optimum
condition is as below.(Cooling)
Discharge
temperature
Discharge air
Intake temperature
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