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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. 

 

 

 

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  After selecting the best location, start installation 

according to Indoor/Outdoor Unit Installation 
Diagram. 
1  Install at least 3 cm above the ground. Do not 

install the unit on the floor. 

2  Fix the unit on concrete or rigid frame firmly and 

horizontally by bolt (ø10 mm). Install the 
outdoor unit in a level position and do not block 
the holes. Failure to do so may result in water 
leakage or accumulation. 

3  When installing at roof, please consider strong 

wind and earthquake. Please fasten the 
installation stand firmly with bolt or nails. 

 

 

Connecting the Piping to Indoor Unit 
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. 

 
Connecting the Piping to Outdoor Unit 
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 valves and then tighten with torque 
wrench to the 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)] 

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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. 

 

 
 
 

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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

 flexible cord, type designation 245 IEC 57 or 

heavier cord. 

3  Connect the connection cable between indoor unit and 

outdoor unit according to the diagram below. 

 

 

 

4  Secure the connection cable onto the control board with 

the holder. 

5  Attach the control board cover back to the original 

position with screw. 

6  For wire stripping and connection requirement, refer to 

instruction 11.2.5 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.