LG LS-J0961NL Service Manual ▷ View online
-35-
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
-36-
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 appro-
priately.
the end of the drain outlet should be routed
above the ground. Secure the drain hose appro-
priately.
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.
(9K Btu models: 2EA,
12K Btu models: 3EA)
panel. Pull the lower left and right sides of the
grille toward you and lift it off.
(9K Btu models: 2EA,
12K 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
-37-
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
-38-
3. Evacuation
§
Connect the charge hose end described in the
preceding steps to the vacuum pump to evacu-
ate 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 evacu-
ate 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 vac-
uum pump.
"Lo" knob of the manifold valve and stop the vac-
uum 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.
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 secure-
ly with an adjustable wrench. This process is
very important to prevent leakage from the sys-
tem.
side service port and fasten the flare nut secure-
ly with an adjustable wrench. This process is
very important to prevent leakage from the sys-
tem.
§
Replace the valve caps at both gas and liquid
side service valves and fasten them tight.
side service valves and fasten them tight.
This completes air purging with a vacuum pump.
The air conditioner is now ready to test run.
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 counter-
(2) Remove the service-port cap from the 3-way valve.
(3) To open the 2-way valve turn the valve stem counter-
clockwise approximately 90°, wait for about 2~3 sec,
and close it.
and 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
Control
cover
cover
Liquid side
(Smaller diameter)
(Smaller diameter)
Gas side
(Bigger diameter)
(Bigger diameter)
2-way valve
(open)
(open)
3-way valve
(close)
(close)
Cap
Service port cap
Hexagonal wrench
Terminal block
(pillar terminal)
(pillar terminal)
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
Click on the first or last page to see other LS-J0961NL service manuals if exist.