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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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