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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
U1U2
U1U2U3U4
L1 L2 L3 N
U5U6
L1L2
A B
U1U2
L1L2
A B
U1U2
L1L2
A B
U1U2
L1L2
A B
A B
U1U2U3U4
L1 L2 L3 N
U5U6
A B
A B
Outdoor Power supply
Ground
terminal
Ground
terminal
Outdoor Power supply
Circuit breaker
Circuit breaker
Header outdoor unit
Follower outdoor unit
Control wiring between outdoor units
Control wiring between indoor and outdoor units
Control wiring between indoor units
Outside Air Unit
Other indoor unit
Other indoor unit
Other indoor unit
Ground
Ground
Ground
Ground
Remote
control
Remote
control
Remote
control
Indoor
power
supply
Circuit
breaker
208 /
230-1-60
Disconnect
switch per NEC
Disconnect
switch per
NEC
Disconnect
switch per
NEC
Disconnect
switch per
NEC
Group control
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.
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.
Unit: in (mm)
L1 L2
U1 U2 A B
U1 U2 A B
L1 L2
Indoor / Outdoor
control wiring
(U
1
, U
2
terminals)
Remote control wiring
(A, B terminals)
<MMD-AP048 type>
<MMD-AP072 type, AP096 type>
Power supply wire
Power Supply wire
Indoor / Outdoor
control wiring
(U
1
, U
2
terminals)
Remote control wiring
(A, B terminals)
Conduit pipe
Ground screw
L
1
L
2
0.8" (20)
1.2" (30)
0.4" (10)
Ground wire
25-EN
26-EN
+00EHEH99887601.book Page 13 Thursday, April 21, 2016 9:44 AM
