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37 

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

 

Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation. 

 

There is no extra refrigerant in the outdoor unit for air purging. 

 

OPEN

CLOSE

Gas side

Liquid side

Outdoor unit

Two-way valve

Three-way valve

Indoor unit

Vacuum 
pump

Close

Close

 

 

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

valve. 

o 

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. 
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 Low side 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 REFRIGERENT 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 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. 

o 

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 3 above take the following measure: 

- 

If the leak stops when the piping connections are tightened further, continue working from step 3. 

- 

If the leak does not stop when the connections are retightened, repair location of leak. 

- 

Do not release refrigerant during piping work for installation and reinstallation. 

- 

Take care of the liquid refrigerant, it may cause frostbite. 

 

 
 
 
 
 
 
 

38 

1  Remove the control board cover from the unit by loosening the screw. 
2  Cable connection to the power supply through Isolating Devices (Disconnecting means). 

o 

Connect approved type polychloroprene sheathed power supply cord 3 x 1.5 mm

2 

(3/4 ~ 1.75HP),  

3 x 2.5 mm

2

 (2.0 ~ 2.5HP) type designation 60245 IEC 57 or heavier cord to the terminal board, and 

connect the others end of the cord to Isolating Devices (Disconnecting means). 

o 

Do not use joint power supply cord. Replace the wire if the existing wire (from concealed wiring, or 
otherwise) is too short. 

o 

In unavoidable case, joining of power supply cord between isolating devices and terminal board of air 
conditioner shall be done by using approved socket and plug with earth pin rated 15/16A (3/4 ~ 1.75HP) 
or 16A (2.0HP) or 20A (2.5HP). Wiring work to both socket and plug must follow to national wiring 
standard. 

3  Connection cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed  

4 x 1.5 mm

2

 flexible cord, type designation 60245 IEC 57 or heavier cord. Do not use joint connection cable. 

Replace the wire if the existing wire (from concealed wiring, or otherwise) is too short. Allowable connection 
cable length of each indoor unit shall be 30 m or less. 

4  Connect the power supply cord and connection cable between indoor unit and outdoor unit according to the 

diagram below. 

 

3

2

1

t

i

n

u

 

r

o

o

d

n

i

 

e

h

t

 

n

o

 

s

l

a

n

i

m

r

e

T

Colour of wires (connection cable)

Terminals on the outdoor unit

L

N

1

2

3

(Power supply cord)

Terminals on the isolating 
devices (Disconnecting means)

(L) (N)

 

 

5  Secure the power supply cord and connection cable onto the control board with the holder. 
6  Attach the control board cover back to the original position with screw. 
7  For wire stripping and connection requirement, refer to instruction 12.2.4 of indoor unit. 

 

Terminal 

Board

Holder

Isolating Devices

Indoor unit

Power 

supply 

cord

Indoor & 

outdoor 

connection 

cable

Earth wire 
longer 
than 
others 
AC wires 
for safety 
reason

 

 

 This equipment must be properly earthed.

 
Note 

  Isolating Devices (Disconnecting means) should have minimum 3.0 mm contact gap. 

  Earth wire shall be Yellow/Green (Y/G) in colour and longer than other AC wires for safety reason. 

  Always ensure all above connections compliant with national wire rules. 
 
 
 
 

39 

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 6 mm or above. 

 

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. 

 

When properly fl ared, the internal surface of the 
fl are will evenly shine and be of even thickness. 
Since the fl are part comes into contact with the 
connections, carefully check the fl are fi nish.

 Improper  fl aring 

Inclined Surface 

damaged

Cracked Uneven 

thickness

1.  To cut

2.  To remove burrs

3.  To fl are

Bar

Red arrow mark

Handle

Core

Yoke

Clamp handle

Bar

0 – 0.5 mm

Copper pipe

Reamer

Point down

Pipe

 

 

Please follow the steps below to take out front grille if 
necessary such as when servicing. 

1  Set the vertical airflow direction louvers to the 

horizontal position. 

2  Remove the 2 caps (1/2 ~ 1.75HP) or 3 caps 

(2.0 ~ 2.5HP) on the front grille as shown in 
the illustration at right, and then remove the  
3 (1/2 ~ 1.75HP) or 4 (2.0 ~ 2.5HP) mounting 
screws. 

3  Pull the lower section of the front grille 

towards you to remove the front grille. 

 

When reinstalling the front grille, first set the 
vertical airflow direction louver to the horizontal 
position and then carry out above steps 2 - 3 in 
the reverse order. 

Screw

Screw

Vane

Cap

Test pen

Move 
the vane 
downward

 

• Use Test pen to 

remove Cap

(only for 2.0HP ~ 2.5HP 

model)

Front grille

Front grille

 

 
 
 

  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. 

 

Hose

Install the hose at an angle so that the 
water smoothly fl ows out.

Drain elbow

 

7

 

 

  Open front panel and remove air filters. (Drainage 

checking can be carried out without removing the 
front grille.) 

  Pour a glass of water into the drain tray-styrofoam. 

  Ensure that water flows out from drain hose of the 

indoor unit. 

 

Drain tray-styrofoam

 

 
 

40 

  Operate the unit at cooling/heating operation 

mode for fifteen minutes or more. 

  Measure the temperature of the intake and 

discharge air. 

  Ensure the difference between the intake 

temperature and the discharge is more than 8°C 
during Cooling operation or more than 14°C 
during Heating operation. 

 

Discharge air

 

 

1  Open the front panel. 
2  Remove the air filters. 
3  Put the Air purifying filter into place as shown 

in illustration at right. 

 

1

3

2

Air fi lter

Air purifying filter 

8