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41 

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 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 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 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. 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

OPEN

CLOSE

Gas side

Liquid side

Outdoor unit

Two-way valve

Three-way valve

Indoor unit

Vacuum 
pump

Close

Close

42 

1  Remove the control board cover from the unit 

by loosening the screw. 

2  Connection cable between indoor unit and 

outdoor unit shall be approved 
polychloroprene sheathed 4 x 1.5 mm

2

  

(3/4 ~ 1.5HP) or 4 x 2.5 mm

2

 (2.0HP) 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 mm or less. 

 

 

 

3  Secure the cable onto the control board with 

the holder. 

4  Attach the control board cover back to the 

original position with screw. 

5  For wire stripping and connection requirement, 

refer to instruction 11.2.4.1 of indoor unit. 

 

 

 

 

 This equipment must be properly earthed. 

 

  Earth wire shall be Yellow/Green (Y/G) in colour 

and longer than other AC wires for safety reason. 

 
 

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. 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Terminals on the outdoor unit

1

2

3

Colour of wires

Terminals on the indoor unit

1

2

3

Earth Wire 
longer than 
others AC 
wires for 
safety reason

Terminal 
Board

Holder

Indoor and outdoor 

cable connection

Indoor Unit

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

43 

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 on the front grille as 

shown in the illustration at right, and then 
remove the 2 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. 

The below operations will be performed by pressing the “AUTO” switch. 

1  AUTO OPERATION MODE 

The Auto operation will be activated immediately once the Auto 
Switch is pressed and release before 5 sec.. 

2  TEST RUN OPERATION (FOR PUMP DOWN/SERVICING 

PURPOSE) 
The Test Run operation will be activated if the Auto Switch is 
pressed continuously for more than 5 sec. to below 8 sec.. 
A “pep” sound will occur at the fifth sec., in order to identify the 
starting of Test Run operation. 

 

 

3  HEATING TRIAL OPERATION 

Press the “AUTO” switch continuously for more than 8 sec. to below 11 sec. and release when a “pep pep” 
sound is occured at eight sec. (However, a “pep” sound is occurred at fifth sec..) Then press Remote 
controller “A/C Reset” button once. 
Remote controller signal will activate operation to force heating mode. 

4  REMOTE CONTROLLER RECEIVING SOUND ON/OFF 

The ON/OFF of Remote controller receiving sound can be change over by the following steps: 
a) Press “AUTO” switch continuously for more than 16 sec. to below 21 sec.. 
    A “pep”, “pep”, “pep”, “pep” sound will occur at the sixteenth sec.. 
b) Press the “AC Reset” button once, “pep” sound will occur indicates that Remote controller receiving sound 
    setting mode is activated. 
c) Press “AUTO” switch again. Everytime “AUTO” switch is pressed (within 60 sec. interval), Remote 
    controller receiving sound status will be reversed between ON and OFF. 
    Long “peep” sound indicates that Remote controller receiving sound is ON. 
    Short “pep” sound indicates that Remote controller receiving sound is OFF. 

  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. 

 

 

 
 
 
 
 

Screw

Vane

Vane

Front grille

(Move the vane 
to upward)

Cap

Cap

Hose

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

Drain elbow

 

7

44 

  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. 

 

 

1  Operate the unit at cooling/heating operation mode for fifteen minutes or more. 
2  Measure the temperature of the intake and discharge air. 
3  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. 

 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Drain tray-styrofoam

Discharge air