Wiring Between Indoor And Outdoor Units; Wire Connection - Toshiba MMD-AP0244SPH-E Installation Manual

▼ Power supply
Power supply
Power supply switch / circuit breaker or power supply wiring / fuse rating for indoor units should be selected by the
accumulated total current values of the indoor units.
Power supply wiring
Control wiring, Central controller wiring
• 2-core with polarity wires are used for the Control wiring between indoor unit and outdoor unit and Central
controller wiring.
• To prevent noise trouble, use 2-core shield wire.
• The length of the communication line means the total length of the inter-unit wire length between indoor and
outdoor units added with the central control system wire length.
▼ Communication line
Control wiring between indoor units, and
outdoor unit (2-core shield wire)
Central control line wiring (2-core shield
wire)
Remote controller wiring
• 2-core with non-polarity wire is used for wiring of the remote controller wiring and group remote controllers wiring.
Remote controller wiring, remote controller inter-unit
wiring
Total wire length of remote controller wiring and remote
controller inter-unit wiring = L + L1 + L2 + ... Ln
Total wire length of remote controller inter-unit wiring = L1 + L2 + ... Ln
CAUTION
The remote controller wire (Communication line) and AC 220-240 V wires cannot be parallel to contact
each other and cannot be stored in the same conduits. If doing so, a trouble may be caused on the control
system due to noise or other factor.
Indoor unit Indoor unit
L
Remote
controller
L1
wiring
Remote
Remote controller inter-unit wiring
controller
75-EN
220-240 V ~, 50 Hz
220 V ~, 60 Hz
2
Below 50 m 2.5 mm
(Up to 1000 m) 1.25 mm²
Wire size
(Up to 2000 m) 2.0 mm²
(Up to 1000 m) 1.25 mm²
Wire size
(Up to 2000 m) 2.0 mm²
Wire size: 0.5 mm² to 2.0 mm²
In case of wired type only Up to 500 m
In case of wireless type
Up to 400 m
included
Up to 200 m
Indoor unit Indoor unit
L2 Ln
(Max. 8 units)
 Wiring between indoor and outdoor units
NOTE
An outdoor unit connected with control wiring between indoor and outdoor units wire becomes automatically the
header unit.
▼ Wiring example
Outdoor Power supply
380-415 V ~, 50 Hz
380 V ~, 60 Hz
Circuit breaker
Header outdoor
unit
Earth
L1 L2 L3 N U1 U2 U3 U4 U5 U6
terminal
Control wiring between indoor and outdoor units
Indoor unit
Earth
L N U1 U2 A B
Indoor power supply
A B
220-240 V ~, 50 Hz
220 V ~, 60 Hz
Remote controller
Circuit breaker,
Pull box
Power switch
 Wire connection
REQUIREMENT
• Connect the wires matching the terminal numbers. Incorrect connection causes a trouble.
• Pass the wires through the bushing of wire connection holes of the indoor unit.
• Keep a margin (Approx. 100 mm) on a wire to hang down the electrical control box at servicing or other purpose.
• The low-voltage circuit is provided for the remote controller. (Do not connect the high-voltage circuit)
– 38 –
Outdoor Power supply
380-415 V ~, 50 Hz
380 V ~, 60 Hz
Circuit breaker
Follower outdoor
unit
Earth
L1 L2 L3 N U1 U2 U3 U4 U5 U6
terminal
Control wiring between outdoor units
Control wiring between indoor units
Indoor unit Indoor unit Indoor unit
Earth Earth Earth
L N U1 U2 A B L N U1 U2 A B
A B A B
Remote controller Remote controller
Pull box Pull box
Group control
L N U1 U2 A B
76-EN