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33 

  After selecting the best location, start installation to Indoor/Outdoor Unit Installation Diagram. 

1  Fix the unit on concrete or rigid frame firmly and horizontally by bolt nut (ø10 mm). 
2  When installing at roof, please consider strong wind and earthquake. 

Please fasten the installation stand firmly with bolt or nails. 

 

 

 

 

Model A 

B 

C 

D 

E7*** 

E9*** 

E12*** 

E15*** 

570 mm  105 mm  18.5 mm 320 mm

E18*** 

E24*** 

E28*** 

613 mm  131 mm  16 mm 360.5 mm

Connecting the Piping to Indoor 
Please make flare after inserting flare nut (locate at joint 
portion of tube assembly) 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. 

Do not overtighten, overtightening may cause gas leakage. 

 
 

Piping size 

Torque 

6.35 mm (1/4”) 

[18 N•m (1.8 kgf.m)] 

9.52 mm (3/8”) 

[42 N•m (4.3 kgf.m)] 

12.7 mm (1/2”) 

[55 N•m (5.6 kgf.m)] 

15.88 mm (5/8”) 

[65 N•m (6.6 kgf.m)] 

19.05 mm (3/4”) 

[100 N•m (10.2 kgf.m)] 

Connecting the Piping to Outdoor 
Decide piping length and then cut by using pipe cutter. 
Remove burrs from cut edge. Make flare after inserting 
the flare nut (locate at valve) onto the copper pipe. Align 
center of piping to valve and then tighten with torque 
wrench to the specified torque as stated in the table. 

 

 
Connecting The Piping to Outdoor Multi 
Decide piping length and then cut by using pipe cutter. Remove burrs from cut edge. Make flare after inserting the 
flare nut (locate at valve) onto the copper pipe. Align center of piping to valve and then tighten with torque wrench to 
the specified torque as stated in the table. 
 

34 

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. 

 

 
 
 

35 

 

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) 

or 3 x 4.0 mm

2

 (3.0HP) type designation 

245 IEC 57 or heavier cord to the terminal 
board, and connect the others end of the 
cord to Isolating Devices (Disconnecting 
means). 

3  Connection cable between indoor unit and 

outdoor unit shall be approved polychloroprene 
sheathed 4 x 1.5 mm

2

 flexible cord, type 

designation 245 IEC 57 or heavier cord. 

4  Connect the power supply cord and connection 

cable between indoor unit and outdoor unit 
according to the diagram below. 

 

 
 

 

 

 

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 5 of indoor unit. 

 

 

 



  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. 

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. 

 

36 

Inverter control, which equipped with a microcomputer in determining the most suitable operating mode as time 
passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operating 
mode, the microcomputer maintains the set temperature by measuring the temperature of the environment and 
performing temperature shifting. The compressor at outdoor unit is operating following the frequency instructed by 
the microcomputer at indoor unit that judging the condition according to internal setting temperature and intake air 
temperature. 

Once the operation starts, remote control setting temperature will be taken as base value for temperature shifting 
processes. These shifting processes are depending on the air conditioner settings and the operation environment. 
The final shifted value will be used as internal setting temperature and it is updated continuously whenever the 
electrical power is supplied to the unit. 
 

 

 

  Compressor is OFF when Intake Air Temperature - Internal Setting Temperature < -1.5°C continue for 3 minutes. 

  Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature > 

Compressor OFF point. 

 

  Compressor is OFF when Intake Air Temperature - Internal Setting Temperature < -2.0°C continue for 3 minutes. 

  Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature > 

Compressor OFF point. 

  Compressor is OFF when Intake Air Temperature - Internal Setting Temperature > +2.0°C continue for 3 minutes. 

  Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature < 

Compressor OFF point.