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41

Please make flare after inserting flare nut (locate at joint portion
of indoor piping) onto the copper pipe. 
(In case of using long piping)
Connect the piping

• Align the center of piping and sufficiently tighten the flare nut

with fingers.

• Further tighten the flare nut with torque wrench in specified

torque as stated in the table.

1. Align the center of the pipings and sufficiently tighten the

flare nut with fingers.

2. Finally, tighten the flare nut with torque wrench until the

wrench clicks.

• When tightening the flare nut with torque wrench, ensure

the direction for tightening follows the arrow on the
wrench.

1. Please cut using pipe cutter and then remove the burrs.
2. Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused.

Turn the piping end down to avoid the metal powder entering the pipe.

3. Please make flare after inserting the flare nut onto the copper pipes.

Do not over tighten, over tightening cause gas leakage.

Model

Piping size (Torque)

Gas

Liquid

E10****

3/8” (42 N m)

1/4” (18 N m)

E15****, E18****

1/2” (55 N m)

1/4” (18 N m)

42

WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the
following procedure.

1. Connect a charging hose with a push pin to the Low and High side of a charging set and the service port of the 3-way valve.

• Be sure to connect the end of the charging hose with the push pin to the service port.

2. Connect the center hose of the charging set to a vacuum pump with check valve, or vacuum pump and vacuum pump

adaptor.

3. Turn on the power switch of the vacuum pump and make sure that the needle in the gauge moves from 0 cmHg (0 MPa) to 

-76 cmHg (-0.1 MPa). Then evacuate the air approximately ten minutes.

4. Close the valve of the charging set and turn off the vacuum pump. Make sure that the needle in the gauge does not move

after approximately five minutes.
Note: BE SURE TO TAKE THIS PROCEDURE IN ORDER TO AVOID REFRIGERANT GAS LEAKAGE.

5. Disconnect the charging hose from the vacuum pump and from the service port of the 3-way valve.
6. Tighten the service port caps of both of the 3-way valve at a torque of 18 

N m

 with a torque wrench.

7. Remove the valve caps of both of the 2-way valve and 3-way valve. Position both of the valves to “OPEN” using a hexagonal

wrench (4 mm).

8. Mount valve caps onto the 2-way valve and the 3-way valve.

• Be sure to check for gas leakage.

• If gauge needle does not move from 0 cmHg (0 MPa) to -76 cmHg (-0.1 MPa), in step   above take the following measure: 

• If the leak stops when the piping connections are tightened further, continue working from step   .
• If the leak does not stop when the connections are retightened, repair the location of leak.
• Do not release refrigerant during piping work for installation and reinstallation. Take care of the liquid refrigerant, it may cause frostbite. 

43

(FOR DETAIL REFER TO WIRING DIAGRAM AT UNIT)

1. Remove the control board cover from the unit by loosening the screw.

2. Connecting cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 4 

× 1.5 mm

2

 flexible

cord, type designation 245 IEC 57 or heavier cord.

3. Secure the cable onto the control board with the holder (clamper).
4. Cable connection to the power supply (230 - 240V, 50Hz) through knife switch (Disconnecting means).

• Connect the approved polychloroprene sheathed power supply cable (3 x 1.5 mm

2

), type designation 245 IEC 57 or heavier

cord to the terminal board, and connect the other end of the cable to knife switch (Disconnecting means).

Note: Knife switch (Disconnecting means) should have minimum 3.5 mm contact gap.

- Secure the cable onto the control board with the holder (clamper).

1. Please carry out insulation at pipe connection portion as mentioned in Indoor/Outdoor Unit Installation Diagram. Please wrap

the insulated piping end to prevent water from going inside the piping.

2. If drain hose or connecting piping is in the room (where dew may form), please increase the insulation by using POLY-E

FOAM with thickness 8 mm or above.

• If a drain elbow is used, the unit should be placed on a stand

which is taller than 3 cm.

• If the unit is used in an area where temperature falls below

0

°C for 2 or 3 days in succession, it is recommended not to

use a drain elbow, for the drain water freezes and the fan will
not rotate.

44

Is there any gas leakage at flare nut connections?

Is the Earth wire connection done properly?

Has the heat insulation been carried out at flare nut

Is the power supply voltage complied with the rated value?

connections?

Is there any abnormal sound emitted?

Is the connecting cable being fixed firmly to the terminal board?

Is the cooling / heating operation normal?

Is the connecting cable being clamped firmly?

Is the thermostat operation normal?

Is the drainage OK? (Refer to the “Check the Drainage”
section)

Is the Remote Control’s LCD operation normal?