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–21–

Outdoor

Indoor

Control terminal board

Cord
clamper

Cover control

Main 

power source

Switch box

Circuit Breaker

Main terminal board

view

1

1

Control terminal board

Control box

Control box cover

(On which the Electric

Wiring Connection is put)

Cord clamper

Connection
cord between 
the indoor unit
and the 
outdoor unit

Remote
control cord

Perform the electrical wiring work according to the electrical
wiring connection.

• All wiring must comply with local requirements.
• Select a power source that is capable of supply-

ing the current required by the air conditioner.

• Use a recognized circuit breaker between the

power source and the unit. A disconnection
device to adequately disconnect all supply lines
must be fitted.

• Capacity of circuit breaker

• Remove the control box cover for elec-

trical connection between the indoor
and outdoor unit.(Remove two screws

➀

.)

• Use the cord clamper to fix the cord.

• Remove the control cover for wiring con-

nection.

• Use the cord clamper to fix the cord.
• Earthing work

Connect the cable of diameter 1.6mm

2

or more to the earthing terminal provid-
ed in the control box and do earthing.

Capacity

1 Phase

3 Phase

18K BTU/h

20A

-

24K BTU/h

25A

-

36K BTU/h

35A

25A

–22–

Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following procedure.

■

Use the accessory piping kit or the pipes purchased
locally.

■

Measure the distance between the indoor and the out-
door unit.

■

Cut the pipes a little longer than measured distance.

■

Cut the cable 1.5m longer than the pipe length.

■

Completely remove all burrs from the cut cross section
of pipe/tube.

■

Put the end of the copper tube/pipe to downward direc-
tion as you remove burrs in order to avoid to let burrs
drop in the tubing.

■

Remove flare nuts attached to indoor and outdoor units,
than put them on pipe/tube having completed burr
removal.
(Not possible to put them on after flaring work)

■

Carry out flaring work using flaring tool as shown below.

Firmly hold copper tube in a bar(or die) as indicated
dimension in the table above.

■

Compare the flared work with figure below.

■

If flare is noted to be defective, cut off the flared section
and do flaring work again.

Copper

tube

90

°

Slanted   Uneven  Rough

Pipe

Reamer

Point down

Flare nut

Copper tube

Bar

Copper pipe

Clamp handle

Red arrow mark

Cone

Yoke

Handle

Bar

"A"

Inclined

Inside is shining without scratches.

Smooth all round

Even length

all round

Surface

damaged

Cracked Uneven

thickness

= Improper flaring =

Outside Diameter

"A"

1/4"

0~0.5

3/8"

0.5~0.8

1/2"

0.5~0.8

5/8"

0.8~1.0

3/4"

1.0~1.3

–23–

1. Form the piping according to its routing. Avoid bend-

ing and bending back the same piping point more
than three times. (This will result in hardening the
pipe.)

2. After deforming the piping, align centers of the union

fitting of the indoor unit and the piping, and tighten
them firmly with wrenches.

3. Connect pipe to the service valve or ball valve which

is located below the outdoor unit.

4. After completing the piping connection, be sure to

check if there is gas leakage in indoor and outdoor
connection.

After completing the piping connection, execute vacuum
drying for the connecting piping and the indoor unit.
The vacuum drying must be carried out using the ser-
vice ports of both the liquid and gas side valves.

Outdoor

unit

Liquid side

Flare connection

Flare connection

Gas side

Indoor 

unit

Union

Flare nut fastening torque

Ø6.35mm

1.8kg.m

Ø9.52mm

4.0kg.m

Ø12.7mm

5.5kg.m

Ø15.88mm

6.6kg.m

Ø19.05mm

6.6kg.m

Model

Liquid side piping

Gas side piping

18K, 24K Btu/h

1/4"

5/8"

36K Btu/h

1/4"

5/8"

–24–

Ceiling

1~3mm

Drainage hole

Drainage hole

U-Trap

B

C

A 

≥

 70mm

B 

≥

 2C

C 

≥

 2 x SP

SP = External Pressure

(mmAq)

Ex) External Pressure

= 10mmAq
A 

≥

 70mm

B 

≥

 40mm

C 

≥

 20mm

A

Make sure to be closed.

Unit

Drainage pipe
(Local supply)

Thermal insulator

(Local supply)

Drainage hole

Lay the drain hose with a downware
inclination so water will drain out.

700mm

• Always lay the drain with downward inclination 

(1/50 to 1/100). 
Prevent any upward flow or reverse flow in any part.

• 5mm or thicker formed thermal insulator shall

always be provided for the drain pipe.

1. Install declination of the indoor unit is very important for the drain of the duct type air conditioner.

2. Minimum thickness of the insulation for the connecting pipe shall be 5mm.

• The unit must be horizontal or declined to the drain hose connected when finished installation.

• Upward routing not

allowed

• Install the P-Trap (or U-Trap) to prevent

a water leakage caused by the blocking
of intake air filter.