En-9
6.4. Transmission line
CAUTION
Caution when wiring:
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
6.4.1 Transmission wiring specifications
Follow the specifications below for the transmission cable.
Use Size Cable type Remarks
Transmission cable 0.33 mm²
22AWG LEVEL 4 (NEMA)
nonpolar 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.
6.4.2 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
Transmission line
System
controller
Touch panel
controller
When AB + BC + BD > 500 m
: Signal amplifier is required.
Outdoor unit
Indoor unit
Terminal resistor
Fig. 2
Outdoor unit
Indoor unit
Signal amplifier
System
controller
Touch
panel
controller
Transmission line
Terminal resistor
Terminal resistor
NS 1
NS 2
NOTES:
Do not use loop wiring. This
may lead to parts damage and
erroneous operation.
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
Transmission line
Transmission line
Transmission line
Example: Enable Automatic Address setting
Refrigerant
system 1
Refrigerant
system 2
Refrigerant
system 3
Transmission line
Transmission line
Transmission line
6.5. Wiring method
6.5.1 Connection diagrams
The wiring example for outdoor and indoor units is shown in figure.
N
L1 L2 L3
L1 L2 L3
N
(*2)
(*2)
(*2)
(*1) (*1)
To other refrigerant circuit outdoor unit
Transmission
Transmission
Transmission Transmission
Remote control Remote control Remote control
Power supply Power supply Power supply
Indoor unit Indoor unit Indoor unit
Power supply
230V ~ 50 Hz
Power supply
230V ~ 50 Hz
Power supply
230V ~ 50 Hz
Remote
controller
(2-wire)
Remote
controller
(2-wire)
Remote
controller
(3-wire)
Outdoor
unit
Breaker Breaker Breaker
Power supply: 400V 3N~ 50 Hz
Breaker
Power supply
Breaker:
(1) Earth-leakage circuit breaker
(2) Current breaker (over current)
*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: Ground (Earth) the remote controller if it has a ground (earth) cable.
• There are two types of remote controller: the 2-wire type and the 3-wire type. For details,
refer to the relevant remote controller installation manual. (When connecting the 2-wire
type remote controller, Y3 is not used.)
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