En-13
6.5. Transmission line
CAUTION
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 PROHIBITED
1 wire 2 pcs at one side Wires twisted
2 wires Shorted at edge Shorted at root
6.5.1 Transmission wiring specifi cations
Follow the specifications below for the transmission cable.
Use Size Cable type Remarks
Transmission cable 0.33 mm²
22AWG LEVEL 4 (NEMA)
non-polar 2 core, twisted pair
solid core diameter 0.65 mm
LONWORKS ®
compatible cable
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
A
B
C
D
Transmission line
Outdoor unit
Indoor unit
System
controller
Touch panel
controller
Terminal
resistor
When AB + BC + BD > 500 m :
Signal Amplifier is required.
Fig. 2
NS 1
NS 2
F
H
L
G
K
J
E
P
M
N
Outdoor unit
Indoor unit
Signal Amplifier
System
controller
Touch panel
controller
Transmission line
Terminal resistor
Terminal resistor
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
Refrigerant system 1
Refrigerant system 2
Refrigerant system 3
Transmission line
Transmission line
Transmission line
Example:
Enable Auto-
matic Address
setting
Refrigerant system 1
Refrigerant system 2
Refrigerant system 3
Transmission line
Transmission line
Transmission line
9378945708-02_IM_L9.indb 139378945708-02_IM_L9.indb 13 2022/1/20 15:34:382022/1/20 15:34:38
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