Toshiba MMD-AP0481HF2UL Installation Manual page 14

 Wiring between indoor and outdoor units
CAUTION
The Outside Air Unit and indoor unit for air conditioning cannot be controlled as a group.
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
Other indoor unit
Outside Air 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
25-EN
Outdoor Power supply
Circuit breaker
Follower outdoor unit
Ground
L1 L2 L3 N U1U2U3U4 U5U6
terminal
Control wiring between outdoor units
Other indoor unit
Other 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
– 13 –
 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.
• Keep a margin (Approx. 100 mm) on a wire to hang down the electrical control box at servicing or other purpose.
• 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).
• 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.)
• Set a loop for the connecting wire of the storing part of the indoor unit electrical control; otherwise the electrical
control box cannot be drawn out in service time.
• Mount the cover of the electrical control box without pinching wires.
Indoor / Outdoor
control wiring
(U , U
1
L1L2 U1U2 A B
 Power supply wires and ground wire
1. Strip the wire ends.
Power supply wire: 0.4
Ground wire: 0.8
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.
<MMD-AP048 type> <MMD-AP072 type, AP096 type>
U1 U2 A B
L1 L2
Power supply wire
Remote control wiring
(A, B terminals)
Power Supply wire
terminals)
Indoor / Outdoor
2
control wiring
(U
(10 mm)
"
" (20 mm)
0.8" (20)
1.2" (30)
L L
1 2
0.4" (10)
Ground wire
L1 L2
U1 U2 A B
Ground screw
Conduit pipe
Remote control wiring
(A, B terminals)
, U terminals)
1 2
Unit: in (mm)
26-EN