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■

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.

;

;

Trap is required to prevent water
from entering into electrical parts.

Seal small openings
around pipings with a
gum type sealer.

Taping

Drain
hose

Pipings

Connecting
cable

■

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 equiva-
lent.

;;

;;

;;

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.
(7K, 9K Btu models: 2EA, 
12K, 18K Btu models: 3EA)

Pull the right and
the left side.

Screw

■

Pour a glass of water
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.

■

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

-38-

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 refrig-
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.

■

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 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.

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.

-39-

■

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 manifold valve is
open. Then, run the vacuum pump.
The operation time for evacuation varies with tub-
ing 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.

■

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-
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. 
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 connections by a
soft brush to check for leakage of the connecting points
of the piping.

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

Control
cover 

Liquid side
(Smaller diameter)

Gas side
(Bigger diameter)

2-way valve
(open)

3-way valve
(close)

Cap

Service port cap

Hexagonal wrench

Terminal block
(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

Open

Close

-40-

1. Check that all tubing and wiring have been properly

connected.

2. Check that the gas and liquid side service valves

are fully open.

Remove the battery cover 
by pulling it according to the

arrow direction.

Insert new batteries making 
sure that the (+) and (–) of 
battery are installed correctly.
Reattach the cover by

pushing it back into position.

Anchor the outdoor unit with a bolt and
nut(ø10mm) tightly and horizontally on a con-
crete 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 earth-
quake.
In the case when the vibration of the unit is con-
veyed to the hose, secure the unit with an anti-
vibration rubber.

Operate unit for 15~20 minutes, then check the sys-
tem refrigerant charge:

NOTE: If the actual pressure are higher than shown,

the system is most likely over-charged, and
charge should be removed. If the actual pres-
sure 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

Outside ambient TEMP The pressure of the gas side service valve

35°C(95°F)

4.5~5.5kg/cm

2

G(63.9~78.1 P.S.I.G.)

This is performed when the unit is to be relocated
or the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant in the out-
door unit without loss in refrigerant gas.

CAUTION:
Be sure to perform Pump Down procedure with the
unit cooling mode.

Pump Down Procedure
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.

3. Close the liquid side service valve(all the way in).
4. Turn on the unit's operating switch and start the cool-

ing 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.

Battery Cover

Discharge 
temperature

Discharge air

Intake temperature