Fujitsu AirStage AJYA72GALH Installation Manual page 15

6. 5. 1. Transmission wiring specifi cations
Follow the specifi cations below for the transmission cable.
Use Size
22AWG LEVEL 4 (NEMA)
Transmission
2
0.33mm non-polar 2core, twisted pair
cable
solid core diameter 0.65mm
6. 5. 2. Wiring rules
(1) Basic wiring rules
Total transmission line length: MAX 3600 m (A+C+D+E+F+G+H+J+K+N+W ≤ 3600)
Transmission line length between each unit : MAX 400 m
Transmission line length between outdoor units in a refrigerant system MAX 18 m (L
≤ 18 m , M ≤ 18 m)
Be sure to set 1 terminal resistor in a network segment..
K
M
L
J
(a)
Terminal registor
C D
RB unit
H
Indoor unit
(2) In the following cases, Signal Amplifi er is required.
When the total length of the transmission line exceeded 500 m
(A+C+D+E+F+G+H+J+K+N ≥ 500 m)
When the total number of unit is over 64.
NS 1
K
J
(a)
Terminal resistor
C
D
NS 3
H
*P+C+D+E+J+K+N ≤ 500 m, Q+F+G+H ≤ 500 m
Wire type Remarks
LONWORKS
patible cable
N
W
Transmission line
System controller
A (a to b)
E
(b)
G
F
Touch panel controller
NS 2
N
W
P (a to c)
Q (c to b)
(b)
G
F
Signal amplifi er
The transmission cable connects indoor units belonging to the same RB group. The
transmission cable cannot be used to connect indoor units belonging to different RB
groups.
Refrigerant pipe
®
com-
RB group1
Good
Transmission line
Refrigerant pipe
RB RB
group1 group 2
Good
• If there are more than 321 units(*1) within the network system, a signal amplifi er
(with the fi lter mode: on) must be installed between the master outdoor units. See
the Signal Amplifi er Installation Manual and Design & Technical Manual for more
information.
Signal Amplifi er
(Filter mode: on)
*1) Unit* means indoor unit, outdoor unit, Touch Panel Controller and System Con-
troller, Signal Amplifi er, single split adaptor, Network Convertor etc..
Do not use loop wiring. This may lead to parts damage and erroneous operation.
6. 5. 3. Enabling/Disabling automatic address setting
(c)
You can enable/disable automatic address setting for the indoor unit, RB unit and the
signal amplifi er.
To enable automatic address setting for the indoor unit, connect the indoor unit to
outdoor units under the same refrigerant system.(Fig.4)
Example : Disable Automatic Address setting
Refrigerant
system 1
Refrigerant
system 2
Example : Enable Automatic Address setting
Refrigerant
system 1
Refrigerant
system 2
Transmission line
RB group 2 RB group1
Prohibited
RB unit
(multi type)
RB RB RB
group 3,4 group1 group 2
Prohibited
Transmission line
Transmission line
Transmission line
Transmission line
RB group 2
RB unit
(multi type)
RB
group 3,4
En-14