En-15
6. 5. 1. Transmission wiring specifi cations
Follow the specifi cations below for the transmission cable.
Use Size Wire type Remarks
Transmission
cable
22 AWG
(0.33 mm²)
LEVEL 4 (NEMA) non-polar
2core, twisted, shielded pair,
solid core, diameter 0.026 in
(0.65 mm)
LONWORKS
®
compatible cable
Twisted pair with shielded type.
Use the shielded wire specifi ed and always ground it both end.
6. 5. 2. Wiring rules
(1) Basic wiring rules
Total transmission line length: MAX 11,811 ft (3,600 m) (A+C+D+E+F+G+H+J+K+N+W
≤ 11,811 ft (3,600 m))
Transmission line length between each unit : MAX 1,312 ft (400 m)
Transmission line length between outdoor units in a refrigerant system MAX 59 ft
(18 m) (L ≤ 59 ft (18 m) , M ≤ 59 ft (18 m))
Be sure to set 1 terminal resistor in a network segment..
Indoor unit
Transmission line
RB unit
Terminal registor
System controller
Touch panel controller
A (a to b)
K
N
W
J
L
M
C
D
E
H
G
F
(a)
(b)
(2) In the following cases, Signal Amplifi er is required.
When the total length of the transmission line exceeded 1,640 ft (500 m)
(A+C+D+E+F+G+H+J+K+N ≥ 1,640 ft (500 m))
When the total number of unit is over 64.
C
*P+C+D+E+J+K+N ≤ 1,640 ft (500 m), Q+F+G+H ≤ 1,640 ft (500 m)
Signal amplifi er
Terminal resistor
NS 1
F
H
G
K
J
E
W
N
NS 2
NS 3
D
(a)
(b)
(c)
P (a to c)
Q (c to b)
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.
Transmission line
Refrigerant pipe
RB group1 RB group1RB group 2 RB group 2
GOOD PROHIBITED
RB unit
(multi type)
Transmission line
Refrigerant pipe
RB unit
(multi type)
GOOD
PROHIBITED
RB
group1
RB
group 2
RB
group 3,4
RB
group 3,4
RB
group1
RB
group 2
• 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
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
Transmission line
Transmission line
Example : Enable Automatic Address setting
Refrigerant
system 1
Refrigerant
system 2
Transmission line
Transmission line
9378945159-04_IM.indb 159378945159-04_IM.indb 15 2015/12/1 10:50:562015/12/1 10:50:56
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