LG LS-M3021CL_AL / LS-M3060HL_CL_AL_BL / LS-M3061HL_CL_BL_AL / LS-M3063CL / LS-M3064HL_CL_DL_EL / LS-M3221HL_CL_BL_AL / LS-N3621CL_AL / LS-N3660HL_CL_AL_BL / LS-N3661HL_CL_AL_BL / LS-N3664EL / LS-N3821HL_CL_BL_AL Service Manual ▷ View online
- 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
- 23 -
3) How to fix installation plate
The wall you select should be strong and solid enough to prevent
vibration
vibration
1. Mount the installation plate on the wall with four
type A screws. If mounting the unit on a concrete
wall, use anchor bolts.
wall, use anchor bolts.
Mount the installation plate horizontally by
aligning the centerline using a level.
aligning the centerline using a level.
2. Measure the wall and mark the centerline. It is also
important to use caution concerning the location
of the installation plate-routing of the wiring to
power outlets is through the walls typically.
Drilling the hole through the wall for piping con-
nections must be done safely.
of the installation plate-routing of the wiring to
power outlets is through the walls typically.
Drilling the hole through the wall for piping con-
nections must be done safely.
5-7mm
(0.2~0.3")
Indoor
WALL
Outdoor
Installation Plate
Type "A" screw
Right rear piping
Left rear piping
ø70mm
195mm
115mm
115mm
180mm
Right rear piping
30K, 32K
36K, 38K
Left rear piping
50mm
ø70mm
180mm
115mm
4) Drill a hole in the wall
■
Drill the piping hole with a ø70mm hole core drill.
Drill the piping hole at either the right or the left
with the hole slightly slanted to the outdoor side.
Drill the piping hole at either the right or the left
with the hole slightly slanted to the outdoor side.
- 24 -
1) Flaring work
Main cause for gas leakage is due to defect in flar-
ing work. Carry out correct flaring work in the follow-
ing procedure.
ing work. Carry out correct flaring work in the follow-
ing procedure.
1. Cut the pipes and the cable.
■
Use the piping kit accessory or the pipes
purchased locally.
purchased locally.
■
Measure the distance between the indoor and the
outdoor unit.
outdoor unit.
■
Cut the pipes a little longer than measured
distance.
distance.
■
Cut the cable 1.5m longer than the pipe length.
2. Burrs removal
■
Completely remove all burrs from the cut cross
section of pipe/tube.
section of pipe/tube.
■
Put the end of the copper tube/pipe in a down-
ward direction as you remove burrs in order to
avoid dropping burrs into the tubing.
ward direction as you remove burrs in order to
avoid dropping burrs into the tubing.
3. Putting nut on
■
Remove flare nuts attached to indoor and outdoor
unit, then put them on pipe/tube having complet-
ed burr removal.
(not possible to put them on after flaring work)
unit, then put them on pipe/tube having complet-
ed burr removal.
(not possible to put them on after flaring work)
Copper
pipe
90
°
Slanted Uneven Rough
Bar
Copper pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Pipe
Reamer
Point down
4. Flaring work
■
Carry out flaring work using flaring tool as shown
below.
below.
Firmly hold copper pipe in a die in the dimension
shown in the table above.
shown in the table above.
5. Check
■
Compare the flared work with figure below.
■
If flare is noted to be defective, cut off the flared
section and do flaring work again.
section and do flaring work again.
mm
inch
mm
ø6.35
1/4
0 ~ 0.5
ø9.52
3/8
0 ~ 0.5
ø12.7
1/2
0 ~ 0.5
ø15.88
5/8
0 ~ 1.0
ø19.05
3/4
1.0 ~ 1.3
Outside diameter
A
Flare nut
Copper tube
Inclined
Inside is shiny without scratches
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
2. Flaring Work and Connection of Piping
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