Toshiba Carrier MMD-AP0074BH2UL-1 Installation Manual page 16

CAUTION
The remote control wire (Communication line) and AC208 / 230 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.
 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
460 V -3 - 60 Hz
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 NEC switch per
NEC
Remote
Indoor control
power
supply
Circuit
208 /
230-1-60 breaker
29-EN
Outdoor Power supply
208/230-3-60
460 V -3 - 60 Hz
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
– 15 –
 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 (3 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.
Control wire hole
Conduit
connection
hole
Screw
Cord clamp
L1L2 U1U2 A B Control wire
(2-core
shielded wire)
Remote
control wire
Power supply
wires and
ground wire
Conduit pipe
Lock nut
 Power supply wires and
ground wire
1. Strip the wire ends.
Power supply wire: 0.4" (10 mm)
Ground wire: 0.8" (20 mm)
2. Match the wire colors with the terminal numbers on
the indoor units' and circuit breakers' terminal blocks
and firmly screw the wires to the corresponding
terminals.
3. Secure the ground wire with the ground screw.
4. Fix the wires with a cord clamp.
0.8" (20)
Screw
Ground wire
CAUTION
Electrical control box cover
Firmly tighten the screws of the terminal block.
Keep the wire length as shown in figure below when it
is connected to the terminal block.
Control wire /
Remote control
terminal block
Power supply wires and control
wire
 Address setup
Power supply
terminal block
Cord
Set up the addresses as per the Installation Manual
clamp
supplied with the outdoor unit.
Ground screw
Unit: in (mm)
1.2" (30)
L L
1 2
0.4" (10)
30-EN