LG LS-R126ABG / LS-R126ABL / LS-R126AHG_AEL / LS-R126BBG_RBG / LS-R126CBG_FBG / LS-R126CEL_EEL / S12LHP Service Manual ▷ View online
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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.
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
• Ensure the water flows through the drain hose of the
indoor unit without any leakage and goes out the drain
exit.
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.
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.
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
• 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.
the left side.
Taping
Drain
hose
hose
Pipings
Connecting
cable
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.
Seal a small opening
around the pipings
with gum type sealer.
around the pipings
with gum type sealer.
Trap
Trap
Downward slope
Do not raise
Accumulated
drain water
drain water
Tip of drain hose
dipped in water
dipped in water
Air
Waving
Water
leakage
leakage
Water
leakage
leakage
Ditch
Less than
50mm gap
50mm gap
Water
leakage
leakage
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1. Check that all tubing and wiring have been properly
connected.
2. Check that the gas and liquid side service valves are
fully open.
1. Prepare remote control
1. Remove the battery cover
by pulling it according to the
arrow direction.
arrow direction.
2. Insert new batteries making
sure that the (+) and (–) of
battery are installed correctly.
battery are installed correctly.
3. Reattach the cover by
pushing it back into position.
NOTE:
• Use 2 AAA(1.5volt) batteries. Do not use recharge-
• Use 2 AAA(1.5volt) batteries. Do not use recharge-
able 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.
• 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 influence of wind and earthquake.
• In the case when the vibration of the unit is conveyed
to the hose, secure the unit with an anti-vibration
bushing.
bushing.
3. Evaluation of the performance
Operate unit for 15~20 minutes, then check the system
refrigerant charge:
1. Measure the pressure of the gas side service valve.
2. Measure the temperature of the intake and discharge
refrigerant charge:
1. Measure the pressure of the gas side service valve.
2. Measure the temperature of the intake and discharge
of air.
3. Ensure the difference between the intake tempera-
ture and the discharge is more than 8°C(46°F) (Cool-
ing) or (Heating).
ing) or (Heating).
4. For reference; the gas side pressure of optimum con-
dition is as below.(Cooling)
NOTE: If the actual pressure is higher than shown, the
system is most likely over-charged, and charge
should be removed. If the actual pressure are
lower than shown, the system is most likely
undercharged, and charge should be added.
should be removed. If the actual pressure 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
Discharge
temperature
Discharge air
Intake temperature
5. Test Running
R-22
35°C (95°F)
4~5kg/cm
2
G(56.8~71.0 P.S.I.G.)
R-410A
35°C (95°F)
8.5~9.5kg/cm
2
G(120~135 P.S.I.G.)
Outside ambient
TEMP.
Refrigerant
The pressure of the gas side
service valve.
This is performed when the unit is to be relocated
or the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant in the
outdoor unit without loss in refrigerant gas.
or the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant in the
outdoor 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
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.
gas.
3. Close the liquid side service valve(all the way in).
4. Turn on the unit's operating switch and start the
4. Turn on the unit's operating switch and start the
cooling operation.
5. When the low-pressure gauge reading becomes 1
to 0.5kg/cm2 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.
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.
PUMP DOWN
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3) How to fix installation plate
The wall you select should be strong and solid enough
to prevent vibration
to prevent 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.
• Mount the installation plate horizontally by aligning
wall, use anchor bolts.
• Mount the installation plate horizontally by 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 typi-
cally. Drilling the hole through the wall for piping
connections must be done safely.
location of the installation plate-routing of the
wiring to power outlets is through the walls typi-
cally. Drilling the hole through the wall for piping
connections must be done safely.
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.
hole slightly slanted to the outdoor side.
Installation Plate
Type "A" screw
5-7mm
(3/16"~5/16")
Indoor
WALL
Outdoor
Installation plate
Ø70mm
Left rear piping
Right rear piping
C
D
B
A
Ø70mm
Ø70mm
Left rear piping
Right rear piping
C
E
A
B
D
Installation plate
Installation plate
A
B
C
D
SJ
90
20
80
20
SL, SK
45
40
80
20
SQ
75
12
80
12
SR
0
40
20
40
ST
105
0
210
0
CHASSIS
(Grade)
Distance (mm)
A
B
C
D
E
SM
180
115
-
115
50
SN
180
115
195
115
-
CHASSIS
(Grade)
Distance (mm)
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2. Flaring Work and Connection of Piping
1) Flaring work
Main cause for refrigerant leakage is due to defect in
the flaring work. Carry out correct flaring work using the
following procedure.
the flaring work. Carry out correct flaring work using the
following procedure.
1. Cut the pipes and the cable.
• Use the piping kit accessory or pipes purchased locally.
• Measure the distance between the indoor and the
• Measure the distance between the indoor and the
outdoor unit.
• Cut the pipes a little longer than the measured
distance.
• Cut the cable 1.5m longer than the pipe length.
2. Burr removal
• Completely remove all burrs from the cut cross sec-
tion of pipe/tube.
• Put the end of the copper tube/pipe in a downward
direction as you remove burrs in order to avoid drop-
ping burrs into the tubing.
ping burrs into the tubing.
3. Putting nut on
• Remove flare nuts attached to indoor and outdoor
unit, then put them on pipe/tube having completed
burr removal.
(not possible to put them on after flaring work)
burr removal.
(not possible to put them on after flaring work)
4. Flaring work
• Firmly hold copper pipe in a die in the dimension
shown in the table above.
• Carry out flaring work using flaring tool as shown
below.
5. Check
• Compare the flared work with figure below.
• If flare is noted to be defective, cut off the flared sec-
• Compare the flared work with figure below.
• If flare is noted to be defective, cut off the flared sec-
tion and re-flare it.
Copper
pipe
90
°
Slanted Uneven Rough
Bar
Copper pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Inclined
Inside is shiny without scratches
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
Pipe
Reamer
Point down
Flare nut
Copper tube
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
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