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10. Installation
Specification of Cable and Connecting method
f
For communication cable, 2-core sheathed vinyl cable should be used which satisfies nominal area of
0.75~1.25mm2 thickness. If 2 or more than 3 communication are connected with one cable which is 4, 6 or more
strands, communication malfunction could be caused. Only 2-core sheathed vinyl cable should be used for one
communication line.
f
Maximum connecting length is limited to 1000 m, so you should follow this limit not to cause malfunction of
communication.
f
Maximum number of units that can be connected to the outdoor main unit is 64, so do not exceed this limit.
f
Communication cable should be connected in series as in the figure below, and malfunction of communication
can be occur if many units are connected to the same terminal.
f
Communication cable between indoor and outdoor units and communication cable between outdoor units has no
polarity.
Main unit
Sub unit
Main unit
Sub unit
Sub unit
Ground cable
Ground cable
Ground cable
Communication
cable
Power •
ground cable
Power cable
Power cable
Power cable
Communication
cable between
outdoor units
Communication
cable between
outdoor units
Protection
tube
ELCB
MCCB+
ELB
or
ELCB
MCCB+
ELB
or
ELCB
MCCB+
ELB
or