Table-1 Uv line and Uc line
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2
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S
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L /
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h t
AWG17 to AWG15 : Up to 3280 ft (1000 m)
Table-2 Uh line
W
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2
c -
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T
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S
h
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AWG17 to AWG15 : Up to 3280 ft (1000 m)
Size/Length
AWG14 : Up to 6561 ft (2000 m)
Table-3 Remote control wiring
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2
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AWG20 to AWG14
Up to 1640 ft (500 m)
Up 1312 ft (400 m) in case of two remote control in group control.
Length
Up to 656 ft (200 m) total length of communication wiring between indoor
units (L6)
U (v, h, c) line means of control wiring.
Uv line: Between indoor and outdoor units.
Uc line: Between outdoor and outdoor units.
<U series>
<U series>
Outdoor unit
(SMMS-u)
<U series>*
Indoor unit
<U series>*
Remote control
* Even if the indoor units, the remote control, and the central control device are models other than U series,
their system diagrams for the wiring specifications are the same as the system diagram above.
43-EN
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Uh
U3 U4
U3
U4
U3 U4
U3 U4
U3 U4
U4
U3
Uh
Uh
Uh
Uc
Uc
Uc
Uv
Uv
Uv
U1
U2
U2
U5 U6
U1
U1
U2
U5 U6
U1
U2
U5 U6
U1 U2
U1 U2
U1 U2
U4
U4
U4
Uv
Uv
Uv
A
B
A
B
A
U6
U6
REQUIREMENT
For the central control line (L1) when U-series outdoor units and outdoor units other than U-series are
connected to the central control device, follow the communication wiring specifications for outdoor unit other
than U-series.
Using the same wire type and size, wire each line below.
If the different wire types and sizes are mixed in each line, communication trouble is caused.
Uv line (wiring between indoor and outdoor units) and Uc line (wiring between outdoor and outdoor units) in
U-series
For communication wiring specifications for outdoor unit other than U-series, refer to the Installation Manual
attached to the outdoor unit to be connected.
[Uh-line and line / wiring between outdoor and outdoor units other than U series]
UP to 6561 ft (2000 m)
[Uv line and Uc line in U series]
Up to 3280 ft (1000 m)
Up to 3280 ft (1000 m)
[Between outdoor and outdoor units other than U series]
UP to 328 ft (100 m)
<Other than U series>
Outdoor unit
(SMMS-i)
U1
(SMMS-e)
(MiNi SMMS)
etc.
<U series>*
U1 U2
U1 U2
U4
Indoor unit
Uv
B
A
B
U6
U6
<U series>*
Remote control
– 22 –
(L1 + L5 + L6)
(L2)
(L3 + L4)
(L7)
U3 U4
U3 U4
U3 U4
U4
U3
U2
U2
U5 U6
U1
U1
U2
U5 U6
U1
U2
U5 U6
U1 U2
U1 U2
U4
U4
U4
Uv
Uv
Uv
A
B
A
B
A
B
U6
U6
U6
U1 U2
U4
Uv
A
B
U6
EN
EN
ID
44-EN