DOWNLOAD LG LS-T246CEL Service Manual ↓ Size: 2.73 MB | Pages: 58 in PDF or view online for FREE

Model
LS-T246CEL
Pages
58
Size
2.73 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner
File
ls-t246cel.zip
Date

LG LS-T246CEL Service Manual ▷ View online

1) Selection of the best location
1. Indoor unit
• Do not have any heat or steam near the unit.
• Select a place where there are no obstacles in front of
the unit.
• Make sure that condensation drainage can be conve-
niently routed away.
Do not install near a doorway.
• Ensure that the space around the left and right of the
unit is more than "A". The unit should be installed as
high on the wall as possible, allowing a minimum of
"B" from ceiling.
• Use a stud finder to locate studs to prevent unneces-
sary damage to the wall.
2. Outdoor unit
• If an awning is built over the unit to prevent direct sun-
light or rain exposure, make sure that heat radiation
from the condenser is not restricted.
• Ensure that the space around the back and sides is
more than 10cm. The front of the unit should have
more than 70cm of space.
• Do not place animals and plants in the path of the
warm air.
• Take the air conditioner weight into account and select
a place where noise and vibration are minimum.
• Select a place so that the warm air and noise from the
air conditioner do not disturb neighbors.
2) Piping length and elevation
Installation 
1. Installation of indoor, Outdoor unit 
-19-
More than "A"
More than "B"
More than 2.3m
More than "B"
More than 10cm
More than 10cm
More 
than 60cm
More than 60cm
More than 70cm
Install the indoor unit on the wall where the height
from the floors more than 2.3 meters.
CAUTION
• Capacity is based on standard length and maximum
allowance length is on the basis of reliability.
• Oil trap should be installed every 5~7 meters.
CAUTION
Grade
Clearance(cm)
A
B
7K~28K
10
5
30K~38K
30
12
Pipe Size
Capacity
(Btu/h)
GAS
LIQUID
Max. 
Length
(m)
Additional
Refrigerant
(g/m)
Max.
Elevation
B
(m)
Standard
Length
(m)
7k~14k
3/8"(Ø9.52)
1/4"(Ø6.35)
4 or 7.5
7
15
20
1/2"(Ø12.7)
1/4"(Ø6.35)
4 or 7.5
7
15
20
1/2"(Ø12.7)
1/4"(Ø6.35)
4 or 7.5
15
30
20
18k~28k
5/8"(Ø15.88)
1/4"(Ø6.35)
4 or 7.5
15
30
20
5/8"(Ø15.88)
3/8"(Ø9.52)
4 or 7.5
15
30
30
30k~38k
5/8"(Ø15.88)
3/8"(Ø9.52)
7.5
15
30
30
3/4"(Ø19.05)
3/8"(Ø9.52)
7.5
15
30
50
If case more than 5m
Outdoor unit
Indoor unit
A
B
Outdoor unit
Indoor unit
A
B
A
Oil trap
Outdoor unit
Indoor unit
B
I
-28-
4. Checking the Drainage and Forming the Pipings
1) Checking the drainage
1. To remove the front panel from the indoor unit.
• Set the air direction louvers up-and-down to the posi-
tion(horizontally) by hand.
• Remove the securing screws that retain the front pan-
el. Pull the lower left and right sides of the grille
toward you and lift it off.
2. To check the drainage.
• Pour a glass of water on the evaporator.
• Ensure the water flows through the drain hose of the
indoor unit without any leakage and goes out the drain
exit.
3. Drain piping
• The drain hose should point downward for easy drain
flow.
• Do not make drain piping.
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.
• 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.
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.
• Secure the tapped piping along the exterior wall 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.
• Secure the taped piping along the exterior wall. Form
a trap to prevent water entering the room.
• Fix the piping onto the wall by saddle or equivalent.
Pull the right and
the left side.
Taping
Drain
hose
Pipings
Connecting
cable
Trap is required to prevent water
from entering into electrical parts.
Seal small openings
around pipings with a
gum type sealer.
Seal a small opening 
around the pipings 
with gum type sealer.
Trap
Trap
Downward slope
Do not raise
Accumulated
drain water
Tip of drain hose 
dipped in water
Air
Waving
Water
leakage
Water
leakage
Ditch
Less than 
50mm gap
Water
leakage
-29-
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.
1) Air purging
Air and moisture remaining in the refrigerant system
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.
• Water may lead to corrosion of parts in the refrigera-
tion system.
Therefore, the indoor unit and tubing between the
indoor and outdoor unit must be leak tested and evacu-
ated 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 prop-
erly 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.
• 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.
• 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.
• 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.
Lo
Hi
Indoor unit
Outdoor unit
Manifold valve
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
Pressure 
gauge
5. Air Purging
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.
CAUTION
CAUTION
-30-
3. Evacuation
• Connect the charge hose end described in the pre-
ceding steps to the vacuum pump to evacuate the tub-
ing 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.
4. Finishing the job
• With a service valve wrench, turn the valve stem of
liquid side valve counter-clockwise to fully open the
valve.
• Turn the valve stem of gas side valve counter-clock-
wise 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.
• 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.
• 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.
(1) Remove the caps from the 2-way and 3-way
valves.
(2) Remove the service-port cap from the 3-way valve.
(3) To open the 2-way valve turn the valve stem coun-
terclockwise approximately 90°, wait for about 2~3
sec, and close it.
(4) Apply a soap water or a liquid neutral detergent on
the indoor unit connection or outdoor unit connec-
tions by a 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
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)
Gas side
Liquid side
Cap
Hexagonal wrench
2-way valve
(Open)
3-way valve
(Close)
Indoor unit
Outdoor unit
Lo
Hi
Manifold valve
Vacuum pump
Pressure 
gauge
Open
Close
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  • DOWNLOAD LG LS-T246CEL Service Manual ↓ Size: 2.73 MB | Pages: 58 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the LG LS-T246CEL in PDF for free, which will help you to disassemble, recover, fix and repair LG LS-T246CEL Air Conditioner. Information contained in LG LS-T246CEL Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.