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1  The inside and outside connection cable can 

be connected without removing the front grille. 

2  Connecting cable between indoor unit and 

outdoor unit shall be approved 
polychloroprene sheathed 5 x 2.5mm

2

 

(2.0~2.5HP) flexible cord, type designation 
245 IEC 57 or heavier cord.  
 

 

 

•  Secure the connection cable onto the control 

board with the holder. 

 

 

 

 

 

•  Ensure the colour of wires of outdoor unit and the terminal Nos. are the same to the indoor’s respectively. 

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

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1  Please cut using pipe cutter and then remove the burrs. 
2  Remove the burrs by using reamer. If burrs are 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. 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

27 

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

1  Fix the unit on concrete or rigid frame firmly and horizontally by bolt nut (ø10mm). 
2  When installing at roof, please consider strong wind and earthquake. 

Please fasten the installation stand firmly with bolt or nails. 

 

A

B

C

D

 

 

Model A 

B 

C 

D 

PW18*** 

570 mm 

105 mm  18.5 mm 320 mm

PW24*** 

612.5 mm  131 mm  19 mm  383 mm

 

 
 
 
 

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. 

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. 
 

Torque
wrench

Spanner
or Wrench

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)] 

28 

 

 

 

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 (-01 MPa), in the step e above take the following measure: 

- 

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

- 

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.