Toshiba MMU-AP0057MH-E Installation Manual page 16

 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 V - 415 V ~, 50 Hz
380 V ~, 60 Hz
Circuit breaker
Header outdoor
unit
Earth
L1 L2 L3 N U1 U2 S U3 U4 U5 U6
terminal
Communication wiring between indoor and outdoor units
Indoor unit
Earth
L N U1 U2 A B
Indoor power supply
A B
220 V - 240 V ~, 50 Hz
220 V ~, 60 Hz
Remote controller
Circuit breaker,
Pull box
Power switch
29-EN
Outdoor Power supply
380 V - 415 V ~, 50 Hz
380 V ~, 60 Hz
Circuit breaker
Follower outdoor
unit
Earth
S L1 L2 L3 N U1 U2 S U3 U4 U5 U6 S
terminal
Control wiring between outdoor units
Communication 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
– 15 –
 Wire connection
REQUIREMENT
• Connect the wires matching the terminal numbers. Incorrect connection causes a trouble.
• Route the wire through the wire connection port of the indoor unit.
• The low-voltage circuit is provided for the control wire and remote controller wire. (Do not connect the high-voltage
circuit.)
1. Loosen the two screws, and remove the cover of electrical control box by sliding in the direction of the arrow.
2. Connect the power supply wire, communication wires and remote controller wire to the terminal block of the
electrical control box.
3. Tighten the screws of the terminal block, and fix the wires with cord clamp attached to the electrical control box.
(Do not apply tension to the connecting section of the terminal block.)
4. Mount the cover of the electrical control box without pinching wires.
(Mount the cover after wiring on the ceiling panel.)
L N U1 U2 A B
Communication
wires (U1, U2
terminals)
*1
Cord clamp
Remote controller wires (A, B terminals)
Cover of electrical control box
Hook part
Select side C or D for the cord clamp position referring to the
following table according to the cable type and diameter.
* Cord clamp can be attached on either right or left side.
When twin system are connected, clamp two cables with one cord
clamp.
Cord clamping
Wire type Specification
position
Cabtyre cable 3-core stranded wire 2.5 mm² Side D
Cabtyre cable 4-core stranded wire 1.5 mm² Side C
Earth screw
Power supply wires (L, N terminals)
Screws
Side C
(Space: 4 mm)
Side D
(Space: 8.5 mm)
*1
Cord clamp
30-EN