Wiring Between Indoor And Outdoor Units; Wire Connection - Toshiba MMC-AP0181H2UL Installation Manual

17-EN
Ceiling type

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
208/230-3-60
Circuit breaker
Header outdoor unit
Ground Ground
L1 L2 L3 N U1U2U3U4 U5U6
terminal terminal
Control wiring between indoor and outdoor units
Control wiring between indoor units
Indoor unit Indoor unit
Ground Ground
L1L2 U1U2 A B
Disconnect Disconnect
A B
switch per
switch per NEC
NEC
Remote
Indoor control
power
supply
208/230- Circuit
breaker
1-60
Installation Manual
Outdoor Power supply
208/230-3-60
Circuit breaker
Follower outdoor unit
L1 L2 L3 N U1U2U3U4 U5U6
Control wiring between outdoor units
Indoor unit Indoor unit
Ground Ground
L1L2 U1U2 A B L1L2 U1U2 A B
Disconnect Disconnect
A B A B
switch per switch per
NEC NEC
Remote Remote
control control
Group control
– 9 –
Ceiling type

Wire connection

REQUIREMENT
• Connect the wires matching the terminal numbers. Incorrect connection causes a trouble.
• The low-voltage circuit is provided for the control wire and the remote control wire. (Do not connect the high-
voltage circuit)
• Loosen the cover mounting screws (2 positions) of the electrical control box, and then remove the cover.
• Attach the conduit pipe to the conduit hole with a lock nut.
• Slit the film of bushing attached to the hole for control wire and remote control wire, and then pass through wires.
• Connect the power supply wires, control wiring and the remote control wire to the terminal block of the electrical
control box. Secure the ground wire with the ground screw.
• Tighten screws of the terminal block securely, and fix the wires with code clamp attached to the electrical control
box. (Do not apply tension to the connecting section of the terminal block.)
• Mount the cover of the electrical control box so that it does not pinch the wires.
L1L2 U1U2 A B
Two screws
Electrical control
box
P.C. board
Control wiring/Remote
control terminal block
Power supply
terminal block
Wire partition plate
Pass the remote control wire and control wire Hole for Remote control wires and
control wires
through the hole and behind this wire partition plate.
18-EN
Installation Manual
Terminal block
Conduit hole
Ground screw
Power supply wires and
ground wire
Cord clamp
Remote control wires and control
wires