Fujitsu Airstage J-II Series Design & Technical Manual page 610

z Step 4 : Confirm how to install Signal Amplifier
„
When Signal Amplifier is installed, network is divided into two network segments.
In a network segment (NS) divided by a Signal Amplifier, it has to keep the following facts.
1)Total transmission line length: MAX 1,640 ft. (500 m)
AB+BC+BD < 1,640 ft. (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.
Terminal
resistor
Outdoor unit
B
A
D
Indoor unit
When AB+BC+BD+DE+EF>1,641 ft.
(500m) :Signal Amplifier is required.
z Step 5 : Confirm how to wire transmission line
„
Confirm 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.
„
Transmission line
X1 X2
TRANS-
MISSION
Indoor unit
z Step 6 : Confirm transmission wiring system
„
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.
Fig. 1
Transmission line
System
C
Controller
E
F
Touch
Panel
Controller
X1 X2
TRANS-
MISSION
Indoor unit
- (06 - 46) -
Fig. 2
Terminal
resistor
Outdoor unit
A
Transmission line
B
D
Terminal resistor
E
G
NS 3
Signal Amplifier
Indoor unit
NS 1
Touch
C
Panel
Controller
NS 2
System
F
Controller
NS 4
H