Installation Instructions

24
Design of control wiring
• Connect each wire for controlling as shown below.
Size
Name Q’ty
Up to 500m Up to 1000m 1000 to 2000m
Specification
Control wiring
(indoor-indoor / indoor-outdoor / outdoor-
indoor control wiring, central control wiring)
2 cores 1.25mm² 2.0mm² Shield wire
Remote controller wiring 2 cores 0.5 to 2.0mm²— — —
• Wire specification, quantity, size of crossover wiring and remote controller wiring
1. The crossover wiring and central control wiring use 2-core non-polarity transmission wires. Use 2-core shield
wires to prevent noise trouble. In this case, close (connect) the end of shield wires, and perform the functional
grounding for the end of the shield wires which are connected to both indoor and outdoor units.
For the shield wires which are connected between the central remote controller and the
outdoor unit, perform the functional grounding at only one end of central control wiring.
2. Use 2-core and non-polarity wire for remote controller. (A, B terminals)
Use 2-core and non-polarity wire for wiring of group control. (A, B terminals)
Connection of shield wire must be connected
(Connected to all connecting sections in each Indoor unit)
U2U1
For control
wiring between
indoor and
outdoor
U3 U4
For wiring of
central control
system
Relay
connector
(Open)
(Open)
To other
refrigerant
system
Relay connector
(At shipment from factory : No connection)
Control wiring between indoor and outdoor units
Control wiring between indoor units
Indoor control
P.C. board
CN82
Central remote controller (Option)
U1
U3
U2
U4
Shield earth screw
Control wiring between indoor
and outdoor units
Cable clamp
U3 U4U2U1
U2U1 U2U1 U2U1 U2U1
PMV Kit
(Option)
[Outdoor unit]
[Indoor unit]