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-30-

• Connect the charge hose end described in the pre-

ceding steps to the vacuum pump to evacuate the tub-
ing 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 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 coun-

terclockwise 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
connecting points of the piping.

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

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)

Gas side

Liquid side

Cap

Hexagonal wrench

2-way valve

(Open)

3-way valve

(Close)

Indoor unit

Outdoor unit

Lo

Hi

Manifold valve

Vacuum pump

Pressure 
gauge

Open

Close

-31-

1. Check that all tubing and wiring have been properly

connected.

2. Check that the gas and liquid side service valves are

fully open.

1. Remove the battery cover 

by pulling it according to the
arrow direction.

2. Insert new batteries making 

sure that the (+) and (–) of 
battery are installed correctly.

3. Reattach the cover by

pushing it back into position.

NOTE:
• Use 2 AAA(1.5volt) batteries. Do not use recharge-

able batteries.

• Remove the batteries from the remote control if the

system is not going to be used for a long time.

• Anchor the outdoor unit with a bolt and nut(ø10mm)

tightly and horizontally on a concrete 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 earthquake.

• In the case when the vibration of the unit is conveyed

to the hose, secure the unit with an anti-vibration
bushing.

Operate unit for 15~20 minutes, then check the system
refrigerant charge:
1. Measure the pressure of the gas side service valve.
2. Measure the temperature of the intake and discharge

of air.

3. Ensure the difference between the intake tempera-

ture and the discharge is more than 8°C(46°F) (Cool-
ing) or (Heating).

4. For reference; the gas side pressure of optimum con-

dition is as below.(Cooling)

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
undercharged, and charge should be added.

The air conditioner is now ready for use.

Bolt

Tubing connection

Discharge 

temperature

Discharge air

Intake temperature

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.)

Outside ambient

TEMP.

Refrigerant

The pressure of the gas side 

service valve.

This is performed when the unit is to be relocated
or the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant in the
outdoor 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

cooling 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.

-20-

The wall you select should be strong and solid enough
to prevent vibration

type A screws. If mounting the unit on a concrete
wall, use anchor bolts.
• Mount the installation plate horizontally by aligning

the centerline using a level.

• Drill the piping hole with a ø70mm hole core drill. Drill

the piping hole at either the right or the left with the
hole slightly slanted to the outdoor side.

Installation Plate

Type "A" screw

5-7mm

(3/16"~5/16")

Indoor

WALL

Outdoor

Installation plate

Ø70mm

C

D

B

A

Ø70mm

Ø70mm

C

E

A

B

D

Installation plate

Installation plate

A

B

C

D

SJ

90

20

80

20

SL, SK

45

40

80

20

SQ

75

12

80

12

SR

0

40

20

40

ST

105

0

210

0

CHASSIS

(Grade)

Distance (mm)

A

B

C

D

E

SM

180

115

-

115

50

SN

180

115

195

115

-

CHASSIS

(Grade)

Distance (mm)

-21-

Main cause for refrigerant leakage is due to defect in
the flaring work. Carry out correct flaring work using the
following procedure.

• Use the piping kit accessory or pipes purchased locally.
• Measure the distance between the indoor and the 

outdoor unit.

• Cut the pipes a little longer than the measured 

distance.

• Cut the cable 1.5m longer than the pipe length.

• Completely remove all burrs from the cut cross sec-

tion of pipe/tube.

• Put the end of the copper tube/pipe in a downward

direction as you remove burrs in order to avoid drop-
ping burrs into the tubing.

• Remove flare nuts attached to indoor and outdoor

unit, then put them on pipe/tube having completed
burr removal.
(not possible to put them on after flaring work)

• Firmly hold copper pipe in a die in the dimension

shown in the table above.

• Carry out flaring work using flaring tool as shown

below.

5. Check
• Compare the flared work with figure below.
• If flare is noted to be defective, cut off the flared sec-

tion and re-flare it.

Copper

pipe

90

°

Slanted   Uneven  Rough

Bar

Copper pipe

Clamp handle

Red arrow mark

Cone

Yoke

Handle

Bar

"A"

Inclined

Inside is shiny without scratches

Smooth all round

Even length

all round

Surface

damaged

Cracked Uneven

thickness

= Improper flaring =

Pipe

Reamer

Point down

Flare nut

Copper tube

mm

inch

mm

Ø6.35

1/4

0~0.5

Ø9.52

3/8

0~0.5

Ø12.7

1/2

0~0.5

Ø15.88

5/8

0~1.0

Ø19.05

3/4

1.0~1.3

Outside diameter