Toshiba MCY-MAP0401HT Installation Manual page 16

Design of control wiring
1. All control wiring is 2-core and non-polarity wire.
2. Ensure use of shielded wiring in the following cases to prevent noise issues.
• Indoor-indoor / outdoor-indoor control wiring, Central control wiring.
Central control
device
U1 U2
U3 U4
U3 U4 U3 U4
[Outdoor unit]
U1 U2 U1 U2
L1
U1 U2 U1 U2 U1 U2
[Indoor unit]
A B A B
Table-3
Remote controller Remote controller
Table 1 Control wiring between indoor and
outdoor units (L1, L2, L3),
Central control wiring (L4)
Wiring
2-core, non-polarity
Type Shield wire
Size
1.25 mm² : Up to 1000 m
Length *1
2.0 mm² : Up to 2000 m
NOTE
*1: Total of control wiring length for all refrigerant circuits ( L1 + L2 + L3 + L4 )
Table 3 Remote controller wiring (L6, L7)
Wire
2-core
Size 0.5 mm² to 2.0 mm²
• Up to 500 m ( L6 + L7 )
Length • Up to 400 m with of wireless remote controller in group control.
• Up to 200 m total length of control wiring between indoor units ( L6 )
▼ Group Control through a Remote Controller
Group control of multiple indoor units (8 units) through a single remote controller
Indoor unit No.1 No.2 No.3
A B A B
(A, B)
Remote
controller
29-EN
MINI-SMMS (Super modular multi system)
Table-1
L4
Header
unit
U3 U4
U1 U2 U5 U6
Table-1
L 2
U1 U2 U1 U2 U1 U2 U1 U2
A B A B A B A B A B
L7 L7
L6
Remote controller
Table 2 Control wiring between outdoor
units (L5) (SMMS series)
Wiring
2-core, non-polarity
Type Shield wire
Size
1.25 mm² to 2.0 mm²
Length
Up to 100 m (L5)
No.4 No.7
A B A B A B
– 15 –
• Connect each wire for controlling as shown below.
Central remote controller (Option)
SMMS
(Open)
Follower
unit
U3 U4
[Outdoor unit]
U1 U2 U5 U6
Table-2
U1
L5
L 3
U1 U2 U1 U2
A B A B
L6
[Indoor unit]
PMV Kit
U1
(Option)
CN82
• Wire specification, quantity, size of crossover wiring and remote controller wiring
Control wiring
(indoor-indoor / indoor-outdoor / outdoor-indoor
control wiring, central control wiring)
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.
No.8
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)
A B
U1 U2
U3 U4
(Open)
To other
Relay
U1 U2
refrigerant
connector
For control
system
wiring between
indoor and
outdoor
U2 U3 U4
Relay connector
(Factory default : No connection)
Control wiring between indoor and outdoor units
Connection of shield wire must be connected
Control wiring between indoor units
(Connected to all connecting sections in each Indoor unit)
U2 U1 U2
Indoor control
P.C. board
Name Q'ty
Up to 500 m
2 cores 1.25 mm²
2 cores 0.5 to 2.0 mm²
U3 U4
Cable clamp
For wiring of
central control
system
Shield earth screw
Control wiring between indoor
and outdoor units
U1 U2 U1 U2
Size
Specification
Up to 1000 m 1000 to 2000 m
2.0 mm² Shield wire
— — —
30-EN