1 2 3
A B
U3 U4
U1 U2
1 2 3
1 2 3
A B
U3 U4
1 2 3
1 2 3
A B
1 2 3
3.1.4 Wiring Specifications
Number of wires
2
Size
Up to 1000m: 1.25mm2 stranded wires
Up to 2000m: 2.0mm2 stranded wires
Specification
MVVS
• A 2-wire non-polarity cable is used.
• The cable length depends on each central control system.
When used in a system including multiple air conditioners, the length includes the length of all wires
between indoor and outdoor units on the side of multiple air conditioners.
• Use 2-wire shield cable (MVVS) to protect from noise.
• Joint shield wire between indoor units by closed-end terminating, and leave its end open with insulation
processing.
Make one-point grounding at the indoor unit side. Set the terminating resistors.
(Central control for custom indoor units only)
A
Joint shield wire between indoor units by closed-end terminating.
B
Leave the end of the shield wire open with insulation processing.
C
Make one-point grounding at the indoor unit side.
N
o
t
e
s
Central controller
Note
B
Note
A
Outdoor
unit
Indoor
unit
Header Follower
R/C R/C R/C
(Group operation)
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