En-8
6.2. Knockout
hole
CAUTION
Be careful not to deform or scratch the panel while opening the knockout holes.
After opening the knockout hole, remove the burr on the edges to prevent snapping of
cables.
It is recommended to apply rust proof paint on the edges to prevent rust.
Knockout holes are provided for wiring.
Service
panel
Knockout holes are provided 2 each in the same size in front, lateral and rear sides.
Front connection
Lateral connection
Rear connection
6.3. Selecting power supply cable and breaker
CAUTION
Obtain the distribution network operator's agreement about the power capacity of the
power supply system and specification of the cable. when you connect the outdoor unit
with the power supply.
Regulation of wire size and circuit breaker differs from each locality, please refer in ac-
cordance with local rules.
• Select the power cable type and size in accordance with relevant local and national
regulations.
• Make sure the specifications for local wiring power cable and branch wiring are in com-
pliance with local code.
• Select the correct cable type and size according to the country or region’s regulations.
• Use copper conductors only.
• Max. wire length: Set a length so that the voltage drop is less than 2%. Increase the wire
diameter when the wire length is longer.
Selecting power supply cable and breaker when connecting single outdoor unit.
Refer to the table for the breaker specifications of each installation condition.
Use
Size
Remarks
Power supply cable
8 AWG (8.4 mm²)
2 cable + Ground, ~, 208/230 V
Model
MCA
MAX. CKT. BKR
GFEB
AOU36RLAVS
33 A
40 A
30 mA
0.1 sec or less
AOU48RLAVS
MCA: Minimum Circuit Amp.
MAX. CKT. BKR: Maximum Circuit Breaker
• Select the appropriate breaker of the described specification according to the national or
regional standards.
• Select the breaker that enough load current can pass through it.
In case of connected outdoor unit
Breaker 1: Ground Fault Equipment Breaker (GFEB)
Breaker 2: Maximum Circuit Breaker (MAX. CKT. BKR)
GOOD
Transmission cable
Remote controller cable
208/230 V
~ 60 Hz
Breaker 1
208/230 V ~ 60 Hz
Outdoor unit power
supply cable
Indoor unit
power supply
cable
Breaker 2
Breaker 1
Breaker 2
6.4. 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
6.4.1. Transmission wiring speci
fi
cations
Follow the specifications below for the transmission cable.
Use
Size
Wire type
Remarks
Transmission
cable
22 AWG
(0.33 mm²)
LEVEL 4 (NEMA) non-polar 2 core,
twisted, shielded pair, solid core,
diameter 0.026 in (0.65 mm)
LONWORKS
®
compatible cable
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 11,811 ft (3,600 m)
EF + EG + GH + HJ + HK + KL < 11,811 ft (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 > 1,640 ft (500 m) (Fig. 1)
2)
When the total number of units* is over 64.
3)
Transmission line length between each unit*
≥
1,312 ft (400 m)
(2) Length of transmission cable between 1 network segment (NS)
EF + EG + GH + HJ + HK
≤
1,640 ft (500 m) (Fig. 2)
KL
≤
1,312 ft (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.
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