Toshiba Carrier MMD-AP0304H2UL Manuel D'installation page 12

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
Circuit breaker
Header outdoor unit
Ground
L1 L2 L3 N U1U2U3U4 U5U6
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
Circuit
208 /
230-1-60 breaker
21-EN
Outdoor Power supply
Circuit breaker
Follower outdoor unit
Ground
L1 L2 L3 N U1U2U3U4 U5U6
terminal
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
– 11 –
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.
• The low-voltage circuit is provided for the remote
control. (Do not connect the high-voltage circuit)
• Remove the cover of the electrical control box by
taking off the mounting screws (2 positions).
• Attach the conduit pipe with a lock nut.
• 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.)
• Mount the cover of the electrical control box without
pinching wires.
Electrical control
box
L1L2 U1U2 A B
Conduit plate
Ground
screw
Electrical control box cover fixed screw
Bushing of control and
remote control wires
Electrical control box cover
U1 U2 A B L1 L2
Cord Conduit Conduit
clamp plate pipe
22-EN