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6.4. 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
6.4.1 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.
6.4.2 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.
1)
When the total length of the transmission line exceeded 500 m.
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)
Unit* means indoor unit, outdoor unit, Touch panel controller and System controller, Signal
amplifier, Single split adaptor, Network convertor etc.
Fig. 1
Terminal resistor
Outdoor unit
Indoor unit
When AB + BC + BD > 500 m
: Signal amplifier is required.
Fig. 2
NS 1
Outdoor unit
Indoor unit
Terminal resistor
Transmission line
Signal amplifier
NS 2
Terminal resistor
En-9
CAUTION
PROHIBITED
Wires twisted
Shorted at edge
Shorted at root
Cable type
LONWORKS ®
compatible cable
System
Transmission line
controller
Touch panel
controller
NOTES:
Do not use loop wiring. This
may lead to parts damage and
erroneous operation.
Touch
panel
controller
System
controller
6.4.3 Enabling/Disabling automatic address setting
You can enable/disable automatic address setting for the indoor unit and the signal ampli-
fier.
To enable automatic address setting for the indoor unit, connect the indoor unit to outdoor
units under the same refrigerant system.
Example: Disable Automatic Address setting
Refrigerant
system 1
Refrigerant
system 2
Refrigerant
system 3
Example: Enable Automatic Address setting
Refrigerant
system 1
Refrigerant
system 2
Remarks
Refrigerant
system 3
6.5. Wiring method
6.5.1 Connection diagrams
Power supply: 400V 3Φ 50 Hz
Outdoor
unit
Power supply
Transmission
Transmission
Power supply
*1
Breaker
Power supply
230V 1Φ 50 Hz
*1: The number of power supply terminals is different depending on the indoor unit
model. For the wiring, refer to the indoor unit installation manual.
*2: Earth (Ground) the remote controller if it has an earth (ground) cable.
• There are two types of remote controller: the 2-wire type and the 3-wire type. For details,
see the relevant remote controller installation manual. (When connecting the 2-wire type
remote controller, Y3 is not used.)
The wiring example for outdoor and indoor units is shown in figure.
Transmission line
Transmission line
Transmission line
Breaker:
(1) Earth leakage circuit breaker
L1 L2 L3
N
(2) Current breaker (over current)
Breaker
L1 L2 L3
N
To other refrigerant circuit outdoor unit
Indoor unit
Indoor unit
Transmission
Remote control
Remote control
Power supply
*1
*2
Breaker
*2
Power supply
Remote
Remote
controller
230V 1Φ 50 Hz
controller
(2-wire)
(2-wire)
Transmission line
Transmission line
Transmission line
Indoor unit
Transmission
Remote control
Power supply
*1
*2
Breaker
Power supply
Remote
230V 1Φ 50 Hz
controller
(3-wire)
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