Transmission Line; Wiring Method - Fujitsu AOU36RLAVM4 Installation Manual

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 coating 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
LEVEL 4 (NEMA) nonpolar 2-core,
Transmission 22 AWG
twisted, shielded pair, solid core,
cable (0.33 mm²)
diameter 0.026 in (0.65 mm)
Twisted pair with shielded type.
Use the shielded wire specified and always ground it both end.
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
Wire 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
Example:
Enable automatic
address setting
Remarks
®

6.5. Wiring method

6.5.1 Connection diagrams
Outdoor unit
Transmission
Indoor unit
Transmission
Power supply
*1
Breaker 2
Breaker 1
Power supply
208/230V ~ 60Hz
*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.
• 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.
Refrigerant
system 1
Refrigerant
system 2
Refrigerant
system 3
Refrigerant
system 1
Refrigerant
system 2
Refrigerant
system 3
Power supply Breaker 1: Ground Fault Equipment
208/230V ~ 60Hz
Breaker 2: Maximum Circuit Breaker
Breaker 1
Breaker 2
To other refrigerant system
outdoor unit
Power supply
Transmission
Indoor unit
Transmission
Remote control Power supply Remote control
*1
Breaker 2
Breaker 1
Remote Remote
controller controller
Power supply
208/230V ~ 60Hz
Transmission line
Transmission line
Transmission line
Transmission line
Transmission line
Transmission line
Breaker (GFEB)
(MAX. CKT. BKR)
Indoor unit
Transmission
Power supply Remote control
*1
Breaker 2
Breaker 1
Remote
controller
Power supply
208/230V ~ 60Hz