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-25-

More than "B"

More than "A"

More than 2.3m

More than "A"

More than 10cm

More than 10cm

More 
than 60cm

More than 60cm

More than 70cm

■

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 conveniently
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 unnecessary dam-
age to the wall.

■ 

If an awning is built over the unit to prevent direct sunlight or
rain exposure, make sure that heat radiation from the con-
denser 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.

Install the indoor unit on the wall where the height from
the floors more than 2.3 meters.

Grade

Clearance(cm)

A

B

7k~18k

10

5

■

If the outdoor unit is installed on a roof structure, be
sure to level the unit. Ensure the roof structure and
anchoring method are adequate for the unit location.

■

Consult local codes regarding rooftop mounting.

7K, 9K(AC)

3/8(Ø9.52)

3/8(Ø9.52)

4 or 7.5

7

15

20

12K, 18k(AC) 1/2(Ø12.7)

3/8(Ø9.52)

5 or 7.5

7

15

20

9K, 12K(DC) 3/8(Ø9.52)

3/8(Ø9.52)

6 or 7.5

7

15

20

Pipe Size

Capacity

(Btu/h)

GAS

LIQUID

Max. 

Length

A 

(m)

Additional

Refrigerant

(g/m)

Max.

Elevation

B

(m)

Standard

Length

(m)

• 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.

Outdoor unit

Indoor unit

Outdoor unit

Indoor unit

-34-

■

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.

■

Tape the piping, drain hose and connecting cable
from down to up.

■

Secure the tapped piping along the exterior wall
using saddle or equivalent.

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.

■

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.

Seal a small opening 
around the pipings 
with gum type sealer.

Trap

Trap

■

Set the air direction louvers up-and-down to the
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.

Pull the right and
the left side.

■

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.

■

The drain hose should point downward for easy
drain flow.

■

Do not make drain piping.

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

-35-

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 evac-
uated to remove any noncondensables and moisture
from the system.

■

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.

■

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.

Lo

Hi

Indoor unit

Outdoor unit

Manifold valve

Charge hose

Nitrogen gas
cylinder(in vertical
standing position)

Pressure 
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.

■

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.

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.

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.

-36-

■

Connect the charge hose end described in the pre-
ceding steps to the vacuum pump to evacuate 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 evac-
uation.

■

When the desired vacuum is reached, close the "Lo"
knob of the manifold valve and stop the vacuum
pump.

■

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 counter-

clockwise 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 con-
necting points of the piping.

(5) If bubbles come out, the pipes have leakage.

Gas side

Liquid side

Cap

Hexagonal wrench

2-way valve

(Open)

3-way valve

(Close)

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

Open

Close