Connecting the Cables
Connect the cable to the indoor unit by con-
necting the wires to the terminals on the con-
trol board individually according to the outdoor
unit connection. (Ensure that the color of the
wires of the outdoor unit and the terminal No.
are the same as those of the indoor unit.)
The power connecting cable with indoor and
outdoor unit should be selected according to
the following national wiring regulations.
The supply cords of parts of appliances for
outdoor use shall not be lighter than poly-
chloroprene sheathed flexible cord.
(code designation 60245 IEC 57, H05RN-F)
Outdoor unit
- Connect the wires to the terminals on the
control board individually.
- Secure the cable onto the control board with
the cord clamp.
- Use a recognized circuit breaker between
the power source and the unit.
A disconnecting device to adequately discon-
nect all supply lines must be fitted.
45±5mm
GN/
YL
20mm
10
±3mm
(mm
2
)
NOMINAL CROSS -
SECTIONAL AREA
Grade
2.5kW~3.5kW
1.0
(mm
2
)
NOMINAL CROSS
-SECTIONAL AREA
Grade
2.5kW~3.5kW
1.0
Circuit Breaker(A)
Grade
2.5kW~3.5kW
15
35±5mm
GN/
YL
20mm
10
±3
mm
CAUTION
- The circuit diagram is a subject to
change without notice.
- The earth wire should be longer than the
common wires.
- When installing, refer to the circuit
diagram on the front panel.
- Connect the wires firmly so that they
may not be pulled out easily.
- Connect the wires according to color
codes, referring to the wiring diagram.
!
CAUTION
The power cord connected to unit should
be selected according to the following
national wiring regulations.
The supply cords of parts of appliances
for outdoor use shall not be lighter than
polychloroprene sheathed flexible cord.
(code designation 60245 IEC 57, H05RN-F)
!
Checking the Drainage
1 Pour a glass of water on the evaporator.
2 Ensure the water flows through the drain
hose of the indoor unit without any leak-
age and goes out the drain exit.
1 The drain hose should point downward for
easy drain flow.
2 Do not make drain piping like the
following.
* The feature can be changed according a
type of model.
Installing drain piping of the
outdoor unit
Depending on installation site, it may be
required to install drain plug for drainage
(Supplied with the unit). In cold areas, do not
use a drain hose with the outdoor unit.
Otherwise, drain water may freeze, impairing
the heating performance.
1 See the figure below for installation of the
drain plug.
A Drain nipple
B Drain cap
C Drain washer
2 Connect a field supplied vinyl hose to the
drain nipple (A). If the hose is too long and
hangs down, fix it carefully to prevent
kinks.
To check the drainage
Drain piping
Connecting area
drain hose
Leakage
checking
Drain
Hose
Leakage
checking
Drain Pan
Downward slope
Do not raise
Water
leakage
Accumulated
drain water
Air
Waving
Water
leakage
Tip of drain hose
dipped in water
Water
leakage
Ditch
Less than
50mm gap
B B
B
B
B
B
B
A
C
* The feature can be changed according to a
type of model.
* The provided parts can be changed accord-
ing to a type of model.
2 Leak test
- Connect the manifold valve(with pressure
gauges) and dry nitrogen gas cylinder to
this service port with charge hoses.
- 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.
- Remove the caps from the 2-way and 3-way
valves.
- Remove the service-port cap from the 3-way
valve.
- Apply a soap water or a liquid neutral deter-
gent on the indoor unit connection or out-
door unit connections by a soft brush to
check for leakage of the connecting points of
the piping.
- If bubbles come out, the pipes have leakage
- 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 pressure Gauge 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 evacua-
tion.
Soap water method
Evacuation
CAUTION
Be sure to use a manifold valve for air purg-
ing. If it is not available, use a stop valve for
this purpose. The knob of the 3-way valve
must always be kept close.
- Pressurize the system to maximum
17.6kg/cm
2
G (R-22 model) or 28.1kg/cm
2
G
(R-410A model) with dry nitrogen gas and
close the cylinder valve when the gauge
reading reaches 17.6kg/cm
2
G (R-22 model)
or 28.1kg/cm
2
G (R-410A model). Next step
is leak test with liquid soap.
!
CAUTION
To avoid nitrogen entering the refrigerant
system in a liquid state, the top of the cylin-
der must be higher than its bottom when
you pressurize the system. Usually, the
cylinder is used in a vertical standing posi-
tion.
!
WARNING
!
There is a risk of fire and explosion.
Inert gas (nitrogen) should be used
when you check plumbing leaks, cleaning
or repairs of pipes etc. If you are using
combustible gases including oxygen,
product may have the risk of fires and
explosions.
Lo
Hi
Indoor unit
Outdoor unit
Manifold valve
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
Pressure
gauge
Cap
Gas side
Liquid side
3-way valve
(Close)
2-way valve
(Close)
Refrigerant
Outside ambient
TEMP.
The pressure of the gas
side service valve.
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.)
CAUTION
Be sure to perform Pump Down procedure
in the cooling mode.
!
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 under-
charged, and charge should be added.
Settlement of outdoor unit
1 Fix the outdoor unit with a bolt and nut
(ø10mm) tightly and horizontally on a con-
crete or rigid mount.
2 When installing on the wall, roof or
rooftop, anchor the mounting base secure-
ly with a nail or wire assuming the influ-
ence of wind and earthquake.
3 If the vibration of the unit is transmitted to
the pipe, secure the unit with an anti-vibra-
tion rubber.
Evaluation of the performance
Operate the unit for 15~20 minutes, then
check the system refrigerant charge:
1 Measure the pressure of the gas side serv-
ice valve.
2 Measure the air temperature from inlet
and outlet of air conditioner.
3 Ensure the difference between the inlet
and outlet temperature is more than 8°C.
4 For reference; the gas side pressure at
optimum condition is shown on table
(cooling)
The air conditioner is now ready to use.
Pump Down
This is performed when the unit is relocated
or the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant
into the outdoor unit without the loss of refrig-
erant.
Pump Down Procedure
- Connect a low-pressure gauge manifold hose
to the charge port on the gas side service
valve.
- Open the gas side service valve halfway and
purge the air in the manifold hose using the
refrigerant.
- Close the liquid side service valve(all the
way).
- Turn on the unit's operating switch and start
the cooling operation.
- 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 and
then quickly turn off the unit. Now Pump
Down procedure is completed, and all refrig-
erant is collected into the outdoor unit.
Discharge
temperature
Discharge air
Intake temperature
Bolt
Tubing connection
Cord clamp
Terminal block
Wiring
diagram
Tubing
cover
Air
Conditioner
Main power source
Circuit breaker
Use a circuit breake
or time delay fuse.
CAUTION
According to the confirmation of the
above conditions, prepare the wiring as
follows.
1 Never fail to have an individual power
circuit specifically for the air condition-
er. 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.)
3 Specification of power source.
4 Confirm that electrical capacity is suffi-
cient.
5 See that the starting voltage is main-
tained 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 specifi-
cation. (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.
- Vibration of a magnetic switch, which
will damage the contact point, fuse
breaking, disturbance of the normal
function 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.
!
CAUTION
Provide the circuit breaker between
power source and the unit as shown by
!
Forming the Piping
Form the piping by wrapping the connecting
portion 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.
In cases where the outdoor unit is installed
below the indoor unit perform the following.
1 Tape the piping, drain hose and connecting
cable from down to up.
2 Secure the tapped piping along the exteri-
or wall using saddle or equivalent.
In cases where the Outdoor unit is installed
above the Indoor unit perform the following.
1 Tape the piping and connecting cable from
down to up.
2 Secure the taped piping along the exterior
wall. Form a trap to prevent water entering
the room.
3 Fix the piping onto the wall using saddle or
equivalent.
Air Purging
The air and moisture remaining in the
refrigerant system have undesirable effects as
indicated below.
1 Pressure in the system rises.
2 Operating current rises.
3 Cooling(or heating) efficiency drops.
4 Moisture in the refrigerant circuit may
freeze and block capillary tubing.
5 Water may lead to corrosion of parts in the
refrigeration system.
Therefore, after evacuating the system, take a
leak test for the piping and tubing between
the indoor and outdoor unit.
Air purging with vacuum pump
1 Preparation
- Check that each tube(both liquid and gas
side tubes) between the indoor and out-
door units have been properly 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.
Taping
Saddle
Drain hose
Pipings
Connecting cable
Seal a small opening
around the pipings
with gum type sealant.
Trap is required to prevent water
from entering into electrical parts.
Drain hose
Vinyl tape(narrow)
Pipe
Wrap with
vinyl tape(wide)
Seal a small opening
around the pipings
with gum type sealant.
Trap
Trap
- When the desired vacuum is reached, close
the knob of the 3-way valve and stop the
vacuum pump.
- With a service valve wrench, turn the valve
of liquid side counter-clockwise to fully open
the valve
- Turn the valve of gas side 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.
- 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.
- Replace the pipe cover to the outdoor unit by
one screw. Now the air conditioner is ready
for test run.
Finishing the Job
Required time for evacuation when 30 gal/h
vacuum pump is used
If tubing length is
less than 10m (33 ft)
If tubing length is
longer than 10m
(33 ft)
10 min. or more
15 min. or more
Outdoor unit
Lo
Hi
Manifold valve
Vacuum pump
Pressure
gauge
Open
Close
Test Running
- Check that all tubing and wiring are properly
connected.
- Check that the gas and liquid side service
valves are fully open.
1 Open the bottom of remote control with
turning it clockwise.
2 Insert the battery. (Match the metal termi-
nals between remote control and battery.)
3 Align the lines with each other, close the
bottom of the remote control with turning
it counterclockwise.
Prepare remote controller
NOTE
!
• Remove the batteries from the remote
controller if the system is not used for a
long time
Metal terminal
1
2
Bottom
CAUTION
- Air conditioners should not be installed in
areas where corrosive gases, such as acid
or alkaline gas, are produced.
- Do not install the product where it could be
exposed to sea wind (salty wind) directly. It
can result corrosion on the product.
Corrosion, particularly on the condenser
and evaporator fins, could cause product
malfunction or inefficient performance.
- If outdoor unit is installed close to the sea-
side, it should avoid direct exposure to the
sea wind. Otherwise it needs additional
anticorrosion treatment on the heat
exchanger.
!
Installation guide at the
seaside
Selecting the location
(Outdoor Unit)
If the outdoor unit is to be installed close to
the seaside, then direct exposure to the sea
wind should be avoided.
Install the outdoor unit on the opposite side of
the sea wind direction.
In case of installing the outdoor unit on the
sea side, setup a windbreak to prevent sea
wind.
- It should be strong enough like concrete to
prevent the sea wind from the sea.
- The height and width should be more than
150% of the outdoor unit.
- Keep more than 70 cm of space between
outdoor unit and the windbreak for easy air
flow.
Select a well-drained place.
Sea wind
Sea wind
- If you can’t meet above guide line in the
seaside installation, please contact LG
Electronics for the additional
anticorrosion treatment.
- Periodic ( more than once/year ) cleaning
of the dust or salt particles stuck on the
heat exchanger by using water
* Do not use seawater when you clean up
the heat exchanger.
Sea wind
Windbreak
Piping Length and Elevation
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
A
B
A
B
CAUTION
Capacity is based on standard length and maximum allowable length is on the basis of relia-
bility. Additional refrigerant must be charged after 7.5m (24.61ft)
!
Capacity
(kW)
Pipe Size
Standard
Length
(m)
Max.
Length
Ⓐ
(m)
Max.
Elevation
Ⓑ
(m)
Additional
Refrigerant
(g/m)
GAS
LIQUID
mm
inch
mm
inch
2.5~3.5
Ø9.52
3/8
Ø6.35
1/4
7.5
15
10
20
Operation ranges
The table below indicates the temperature ranges the air conditioner can be Operated within.
Mode
Indoor temperature
Outdoor temperature
Cooling
18°C ~ 32°C
-10°C ~ 48°C
Heating
16°C ~ 30°C
-15°C ~ 24°C
- Note (Memo) -
9
8
10
11
12
