LG LS-J0761NL_NM_NN / LS-J0962NL_NM_NN / LS-L1261NL_NM_NN / LS-K1860NL_NM_NN_YL / LS-K181N-1 Service Manual ▷ View online
-35-
2) Connect the cable to the outdoor unit
1. Remove the control cover from the unit by loos-
ening the screw.
Connect the wires to the terminals on the control
board individually.
Connect the wires to the terminals on the control
board individually.
2. Secure the cable onto the control board with the
cord clamp.
3. Refix the control cover to the original position with
the screw.
4. Use a recognized circuit breaker 16A(7, 9, 12k),
20A(18k) between the power source and the unit.
A disconnecting device to adequately disconnect
all supply lines must be fitted.
A disconnecting device to adequately disconnect
all supply lines must be fitted.
Over 5mm
Terminal block
(Pillar terminal)
(Pillar terminal)
Holder for
connecting
cable
Control cover
Connecting cable
After the confirmation of the above conditions, prepare the wiring as follows:
1) Never fail to have an individual power circuit specifically for the air conditioner. As for the method of
wiring, be guided by the circuit diagram posted on the inside of control cover.
2) The screw which fasten the wiring in the casing of electrical fittings are liable to come loose from
vibrations to which the unit is subjected during the course of transportation. Check them and
make sure that they are all tightly fastened.
(If they are loose, it could cause burn-out of the wires.)
make sure that they are all tightly fastened.
(If they are loose, it could cause burn-out of the wires.)
3) Specification of power source.
4) Confirm that electrical capacity is sufficient.
5) See to that the starting voltage is maintained at more than 90 percent of the rated voltage marked
4) Confirm that electrical capacity is sufficient.
5) See to that the starting voltage is maintained at more than 90 percent of the rated voltage marked
on the name plate.
6) Confirm that the cable thickness is as specified in the power source specification.
(Particularly note the relation between cable length and thickness.)
7) Always install an earth leakage circuit breaker in a wet or moist area.
8) The following would be caused by voltage drop.
8) The following would be caused by voltage drop.
• Vibration of a magnetic switch, which will damage the contact point, fuse breaking, disturbance of the normal func-
tion of the overload.
9) The means for disconnection from a power supply shall be incorporated in the fixed wiring and
have an air gap contact separation of at least 3mm in each active(phase) conductors.
Outdoor Unit
CAUTION
-36-
3) How to connect between Indoor unit and Outdoor unit
Note
1) The earth line must connect to protect noise of EMI, EMS .
2) If it is not connect the earth line, It may occur safety problems.
3) If it crossed No1, No2 of fillet terminal, it must occur communication error (error code 5) but communication cir-
2) If it is not connect the earth line, It may occur safety problems.
3) If it crossed No1, No2 of fillet terminal, it must occur communication error (error code 5) but communication cir-
cuit is not malfunction.
4) The related earth line must be connected for EMC.
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
AC220v ~ 240V/50Hz
Connecting cable
To OUTDOOR
PCB ASS'Y
To CN-POWER
of INDOOR PCB ASS'Y
To relay pin4
(RY-PWR)
To relay pin3
(RY-PWR)
BR
BL
RD
GY/
YL
-37-
4. Checking the Drainage and Forming the Pipings
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.
;
;
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.
Taping
Drain
hose
hose
Pipings
Connecting
cable
cable
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.
;;
;;
;;
Seal a small opening
around the pipings
with gum type sealer.
around the pipings
with gum type sealer.
Trap
Trap
1) Checking the drainage
1. To remove the front panel from the indoor unit,
remove the front panel from the indoor unit cabi-
net.
net.
■
Set the air direction louvers up-and-down to the
position(horizontally) by hand.
position(horizontally) by hand.
■
Remove the securing screws that retain the front
panel. Pull the lower left and right sides of the
grille toward you and lift it off.
(7K, 9K Btu models: 2EA,
12K, 18K Btu models: 3EA)
panel. Pull the lower left and right sides of the
grille toward you and lift it off.
(7K, 9K Btu models: 2EA,
12K, 18K Btu models: 3EA)
Pull the right and
the left side.
the left side.
Screw
2. To check the drainage.
■
Pour a glass of water
on the evaporator.
on the evaporator.
■
Ensure the water flows
through the drain hose
of the indoor unit with-
out any leakage and
goes out the drain exit.
through the drain hose
of the indoor unit with-
out any leakage and
goes out the drain exit.
3. Drain piping
■
The drain hose should point downward for easy
drain flow.
drain flow.
■
Do not make drain piping.
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
-38-
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 com-
pleted. 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.
between the indoor and outdoor units have been properly
connected and all wiring for the test run has been com-
pleted. 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 ser-
vice port with charge hoses.
gauges) and dry nitrogen gas cylinder to this ser-
vice port with charge hoses.
■
Pressurize the system to no more than 150
P.S.I.G. with dry nitrogen gas and close the cylin-
der valve when the gauge reading reached 150
P.S.I.G. Next, test for leaks with liquid soap.
P.S.I.G. with dry nitrogen gas and close the cylin-
der valve when the gauge reading reached 150
P.S.I.G. Next, test for leaks with liquid soap.
Lo Hi
Indoor unit
Outdoor unit
Manifold valve
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
cylinder(in vertical
standing position)
Pressure
gauge
gauge
■
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.
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.
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.
If it is not available, use a stop valve for this purpose.
The "Hi" knob of the manifold valve must always be
kept close.
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.
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.
CAUTION
CAUTION
5. Air Purging
Click on the first or last page to see other LS-J0761NL_NM_NN / LS-J0962NL_NM_NN / LS-L1261NL_NM_NN / LS-K1860NL_NM_NN_YL / LS-K181N-1 service manuals if exist.