Wiring Between Indoor And Outdoor Units; Wire Connection - Toshiba MMU-AP0074MH-E Installation Manual

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 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 V - 240 V ~, 50 Hz
220 V ~, 60 Hz
Remote controller
Circuit breaker,
Pull box
Power switch
73-EN
Outdoor Power supply
380 V - 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
– 37 –

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 control wire. (Do not connect the high-voltage
circuit.)
• Remove the cover of the electrical control box by removing the mounting screws (3 pcs.) and push the hooking
section. (The cover of the electrical control box remains hanged to the hinge.)
• Tighten the screws on the terminal block and secure the wires with cord clamp fitted to the electrical control box.
(Do not apply tension to the connecting section of the terminal block.)
• Using the supplied heat insulator for the sealing of the wire connecting port, seal the wire connecting port.
(Otherwise dew condensation may be caused.)
• Mount the cover of the electrical control box ensuring the wires are not pinched.
(Mount the cover after the ceiling panel has been wired to the electric box.)
Screws
L N U1 U2 A B
Cord clamp
P.C. board
Screw
Hook part
Indoor / Outdoor
inter-unit wire /
Remote controller
Heat insulator to wiring connecting port
terminal block
U U A B
1 2
Power supply
terminal block
R(L) S(N)
Heat insulator B
Electrical control
box
Cover of electrical control box
Adhered surface
Heat
insulator A
Notched section
74-EN