Multi Variable Air Conditioners Duct Type Indoor Unit 
6 
Material type 
communication line 
between indoor unit 
and wired controller L 
Wire size   
(mm
2
/AWG)
 
Material 
Standard 
Remarks 
Light/Ordinary 
polyvinyl chloride 
sheathed cord. 
(60227 IEC 52 
/60227 IEC 53) 
L≤250m 
(L≤820-1/5feet) 
2×0.75~2×1.25 
(2×AWG18 
~2×AWG16)
 
IEC 60227-
5:2007 
(1)  Total length of communication 
line can't exceed 250m (820-
1/5feet). 
(2)  The cord shall be Circular 
cord (the cores shall be 
twisted together). 
(3)  If unit is installed in places 
with intense magnetic field or 
strong interference, it is 
necessary to use shielded 
3.3.2 Select Communication Line for Indoor Unit and Outdoor Unit 
 
Fig 3.3   
Material Type 
of Communication 
Cable between Indoor 
Unit and Indoor 
Wire size 
  (mm
2
/AWG) 
Material 
Standard 
Remarks 
Light/Ordinary 
sheathed cord. 
(60227 IEC 52 
/60227 IEC 53) 
L≤1000m 
(L≤3280-5/6feet) 
≥2×0.75 
(≥2×AWG18) 
IEC 60227-
5:2007 
(1)  If the wire diameter is 
enlarged to 2×1 mm
2 
(2×AWG16), the total 
communication line length can 
reach 1500 m (4921-1/4feet).   
(2)  The cord shall be Circular 
cord (the cores shall be 
twisted together). 
(3)  If unit is installed in places 
with intense magnetic field or 
strong interference, it is 
necessary to use shielded