Fujitsu Airstage J-II - Page 495

Step 4 : Conrm how to install Signal Amplier
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When Signal Amplier is installed, network is divided into two network segments.
In a network segment (NS) divided by a Signal Amplier, it has to keep the following facts.
1)Total transmission line length: MAX 500 m
AB+BC+BD < 500 m (Fig. 2)
2)The total number of units *1 : MAX 64
3)The number of terminal resistor : 1
*1: Refer detail Meaning of unit on 1-2 VRF NETWORK SYSTEM.
A
B
C
D
E
F
A
B
C
D
NS 1
NS 2
NS 4
NS 3
E
F
G
H
Transmission line
Transmission line
System
Controller
System
Controller
Touch
Panel
Controller
Touch
Panel
Controller
When AB+BC+BD+DE+EF>500m
:Signal Amplier is required.
Signal Amplier
Outdoor unit
Outdoor unit
Fig. 2Fig. 1
Indoor unit
Indoor unit
Terminal
resistor
Terminal
resistor
Terminal resistor
Step 5 : Conrm how to wire transmission line
z
Conrm how to connect transmission line between indoor units.
Arrange so that there is one terminal resistor for each network segment.

●
Always take a ground from both ends of transmission line.

●
X1 X2
TRANS-
MISSION
X1 X2
TRANS-
MISSION
Transmission line
Indoor unit Indoor unit
Step 6 : Conrm transmission wiring system
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Check your transmission wiring system if the transmission wiring system is ensured wiring rule.
Check list
□ Total Transmission wiring length
□ Total number of unit *1
*1: Refer detail Meaning of unit on 1-2 VRF NETWORK SYSTEM.
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SYSTEM DESIGN SYSTEM DESIGN