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Power supply wire
Recommended wire diameter and wire length for power supply wire.
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Electric characteristics
MCA : Minimum Circuit Amps
MOCP : Maximum Overcurrent Protection (Amps)
Control wire
Remote control wiring
2-core with non-polarity wire is used for wiring of the remote control wiring and group remote controls wiring.
NOTE
• Use copper supply wire.
• Use UL wire rated 600 V for the power supply.
• Use UL wire rated 300 V for the remote control wires and control wires.
Power supply wiring
Wire size: 2
AWG12
Ground
1
AWG12 or thicker
Up to 164’1” (50 m)
Model
Power Supply
Voltage Range (V)
MCA
MOCP
Min
Max
(A)
(A)
MMD-AP0074BH2UL
208 / 230 V-1-60 Hz
187
253
1.0
15
MMD-AP0094BH2UL
1.0
15
MMD-AP0124BH2UL
1.0
15
MMD-AP0154BH2UL
1.2
15
MMD-AP0184BH2UL
1.2
15
MMD-AP0214BH2UL
1.8
15
MMD-AP0244BH2UL
1.8
15
MMD-AP0304BH2UL
1.8
15
MMD-AP0364BH2UL
2.3
15
MMD-AP0424BH2UL
2.8
15
MMD-AP0484BH2UL
2.8
15
Control wiring between indoor units, and outdoor unit (2-core
shielded wire)
Wire size
(Up to 3280’10” (1000 m)) AWG16
(Up to 6561’8” (2000 m)) AWG14
Remote control wiring, remote control inter-unit wiring
Wire size: AWG20
Total wire length of remote control wiring and remote control
inter-unit wiring = L + L1 + L2 + … Ln
In case of wired type only
Up to 1640’5” (500 m)
In case of wireless type included
Up to 1312’4” (400 m)
Total wire length of remote control inter-unit wiring = L1 + L2 + … Ln
Up to 656’2” (200 m)
L1
L
L2
Ln
Indoor unit
Remote control inter-unit wiring
Indoor unit
Indoor unit
Indoor unit
Remote
control
(Max. 8 units)
Remote
control
wiring
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.
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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
Indoor unit
Indoor unit
Indoor unit
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
21-EN
22-EN
+00EH99881801_01EN.book Page 11 Friday, November 25, 2011 10:23 AM
