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(2) Selecting main breaker and main power supply cable when connecting multiple
outdoor units
In case of connected 3 outdoor unit
GOOD
Sub
breaker
Outdoor unit power supply cable
400 V 3ø
50 Hz
Main
breaker
Main breaker: Main breaker ≥ Total Sub breaker
(Refer to the table in item (1) for the sub breaker
capacity)
PROHIBITED
400 V 3ø
50 Hz
Outdoor unit power supply cable
PROHIBITED: crossover power
supply wiring prohibited
Breaker
PROHIBITED: install a breaker for
each outdoor unit
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) Basic wiring rules
Total transmission line length: MAX 3600 m
(A + C + D + E + F + G + H + J + K + N + W ≤ 3600)
Transmission line length between each unit: MAX 400 m
Transmission line length between outdoor units in a refrigerant system MAX 18 m
(L ≤ 18 m, M ≤ 18 m)
Be sure to set 1 terminal resistor in a network segment.
Indoor unit
Transmission line
RB unit
Terminal resistor
System controller
Touch panel controller
A (a to b)
6.3. Knockout hole
CAUTION
Seal the wiring route hole with putty (Locally purchased) such that there are no gaps.
Small insects or animals that are trapped in the outdoor unit may cause a short circuit in the
electrical component box.
Be careful not to deform or scratch the panel while opening the knockout holes.
After opening the knockout holes, remove burr on the edges, and attach the conduit or
grommet edging (accessories) to prevent damaging the cables.
It is recommended to apply rust proof paint on the edges to prevent rust.
Electric wires can be connected from the front or from the left.
(Knockout holes are prepared so that wiring can be made from 2 different directions.)
Use the knockout holes on the front and the left separately when necessary.
< Left view >
< Front view >
(Unit: mm)
(Unit: mm)
Length of the grommet edging
Mounting the grommet edging
Grommet edging
(accessories)
Knockout hole
Knockout hole
diameter (mm)
Dimension L
(mm)
Ø 50
147
Ø 43.7
130
Ø 34.5
100
Ø 22.2
60
6.4. Selecting power supply cable and breaker
CAUTION
Obtain the distribution network operator's agreement about the power capacity of the
power supply system, specification of the cable and the harmonic current, and etc.
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.
Refer to the table for the wiring and breaker specifications of each installation condition.
(1) Selecting power supply cable and breaker when connecting 1 outdoor unit
Model
Breaker (Time delay fuse
or circuit capacity)
Outdoor unit power supply cable
Recommended cable size
(mm²)
Limited wir-
ing length
(m)
Fuse capac-
ity (A)
Leakage
current
Power cable
Earth
(ground)
cable
AJ*072GALBH
20
100 mA
0.1 sec or
less
4
4
51
AJ*090GALBH
25
6
6
62
AJ*108GALBH
25
6
6
62
AJ*126GALBH
40
10
10
64
AJ*144GALBH
40
10
10
64
These values are recommended data.
• Specification: Use conformed cord with Type 60245 IEC66
• Max. wire length: Set a length so that the voltage drop is less than 2%. Increase the wire
diameter when the wire length is long.
In case of connected outdoor unit
GOOD
Breaker
Transmission cable
Remote controller cable
Breaker
400 V 3ø 50 Hz
230 V 1ø 50 Hz
Outdoor unit
power supply cable
RB unit
power supply
cable
Indoor unit
power supply
cable
230 v 1ø 50 Hz
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9378945630-02_IM.indb 12
3/6/2020 11:55:23 AM
3/6/2020 11:55:23 AM