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6.5. Transmission line
Caution when wiring cable:
When stripping off the coating of lead wire, always use the exclusive tool such as a
wire stripper. If there is no exclusive tool available necessarily, carefully strip the coat-
ing by a cutter etc. so that the conductive wire is not damaged.
If it is damaged, it may lead to an open circuit and a communication error.
Pay attention to the following points while attaching wires on the terminal board.
• Do not attach 2 wires on one side.
• Do not twist wires.
• Do not cross the wires.
• Do not shorted at edge at root.
GOOD
1 wire
2 pcs at one side
2 wires
6.5.1 Transmission wiring specifi cations
Follow the specifications below for the transmission cable.
Use
Size
22AWG LEVEL 4 (NEMA)
Transmission cable
0.33 mm²
non-polar 2 core, twisted pair
solid core diameter 0.65 mm
Twisted pair with shielded type.
Use the shielded wire specified and always ground it both ends.
6.5.2 Wiring rules
(1) Total length of transmission cable
Total transmission line length : Max. 3,600 m
EF + EG + GH + HJ + HK + KL < 3,600 m (Fig.2)
In the following cases , Signal Amplifier is required.
When the total length of the transmission line exceeded 500 m.
1) AB + BC + BD > 500 m (Fig.1)
2) When the total number of units* is over 64.
3) Transmission line length between each unit* ≥ 400 m
(2) Length of transmission cable between 1 network segment (NS)
EF + EG + GH + HJ + HK ≤ 500 m (Fig.2)
KL ≤ 400 m (Fig.2)
(3) Length of transmission cable between outdoor units in a refrigerant system
MN ≤ 18 m
NP ≤ 18 m
Fig. 1
Outdoor unit
A
Terminal
resistor
Indoor unit
When AB + BC + BD > 500 m :
Signal Amplifier is required.
Fig. 2
Outdoor unit
Terminal resistor
M
G
Transmission line
H
K
Signal Amplifier
Terminal resistor
En-13
CAUTION
PROHIBITED
Wires twisted
Shorted at edge
Shorted at root
Cable type
LONWORKS ®
compatible cable
System
Transmission line
controller
B
D
Touch panel
controller
NS 1
Indoor unit
F
P
N
J
Touch panel
controller
NS 2
System
L
controller
NOTES
• Unit* means indoor unit, outdoor unit, Touch Panel Controller and System Controller,
Signal Amplifier, 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 amplifier.
To enable automatic address setting for the indoor unit, connect the indoor unit to outdoor
units under the same refrigerant system.
Example:
Disable Auto-
matic Address
setting
Remarks
Example:
Enable Auto-
matic Address
setting
C
Refrigerant system 1
Refrigerant system 2
Refrigerant system 3
Refrigerant system 1
Refrigerant system 2
Refrigerant system 3
Transmission line
Transmission line
Transmission line
Transmission line
Transmission line
Transmission line
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