Toshiba Carrier BMS-IFBN1281U-UL Service Manual page 83

BN interface
When the connected outdoor units are other than Super Multi u series (U series)
Wiring specifications
Item
Wire diameter
Wire type
Wire types that can be used
REQUIREMENT
When wiring the control wiring between indoor and outdoor units/central control wiring and the control wiring between outdoor
units, use the same wire type and diameter for each line.
Using a mixture of different wire types and diameters may cause a communication error.
System diagram
BN interface
<Other than U
series>
Outdoor unit
(Super Module
Multi i series
• Super Multi mini)
Indoor unit
Remote
controller
LINK (Uh)
U3 4
U 3 U 4
U4
U 1 U 2 U 5 U 6 U 1
U2
U 1 U 2 U 1 U 2
U4
U v U v
A B
U6
Communication line
Control wiring between indoor and outdoor units and central control
wiring
AWG16: Up to 3281 ft (1000 m)
AWG14: Up to 6560 ft (2000 m)
2-core, non-polar
Shielded wire
[Central control wiring/Control wiring between indoor
and outdoor units]
(L1+L2+L3) = Up to 6560 ft (2000 m)
[Control wiring between indoor and outdoor units]
L4 = Up to 328.1 ft (100 m)
U 3 U 4 U 3 U 4
U3
U 2 U 5 U 6 U 1 U 2 U 5 U 6
U1
U 1 U 2
U4 U4
U v
A B
U6
Service Manual
U 1 U 2
U4
U v
A B A B
U6 U6
-EN
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