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6.3. Knockout hole
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 >
(Unit: mm)
Length of the grommet edging
Knockout hole
Dimension L
diameter (mm)
(mm)
Ø 50
147
Ø 43.7
130
Ø 34.5
100
Ø 22.2
60
6.4. Selecting power supply cable and breaker
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
Breaker (Time delay fuse
or circuit capacity)
Model
Fuse capac-
Leakage
ity (A)
current
AJ*072GALBH
20
AJ*090GALBH
25
100 mA
AJ*108GALBH
25
0.1 sec or
less
AJ*126GALBH
40
AJ*144GALBH
40
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
Transmission cable
GOOD
400 V 3ø 50 Hz
Breaker
Outdoor unit
power supply cable
CAUTION
< Front view >
(Unit: mm)
Mounting the grommet edging
Knockout hole
Grommet edging
(accessories)
CAUTION
Outdoor unit power supply cable
Recommended cable size
(mm²)
Limited wir-
ing length
Earth
Power cable
(ground)
cable
4
4
6
6
6
6
10
10
10
10
230 V 1ø 50 Hz
RB unit
power supply
cable
Breaker
230 v 1ø 50 Hz
Indoor unit
power supply
cable
Remote controller cable
(2) Selecting main breaker and main power supply cable when connecting multiple
outdoor units
In case of connected 3 outdoor unit
GOOD
Sub
breaker
Main
breaker
400 V 3ø
50 Hz
Outdoor unit power supply cable
Main breaker: Main breaker ≥ Total Sub breaker
(Refer to the table in item (1) for the sub breaker
capacity)
6.5. 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 wires
6.5.1 Transmission wiring specifi cations
Follow the specifications below for the transmission cable.
Use
Transmission 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
(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.
51
62
62
64
64
Terminal resistor
RB unit
Indoor unit
PROHIBITED
Breaker
PROHIBITED: install a breaker for
each outdoor unit
400 V 3ø
50 Hz
Outdoor unit power supply cable
PROHIBITED: crossover power
supply wiring prohibited
CAUTION
PROHIBITED
2 pcs at one side
Shorted at edge
Size
Cable type
22AWG LEVEL 4 (NEMA)
0.33 mm²
non-polar 2 core, twisted pair
solid core diameter 0.65 mm
Transmission line
A (a to b)
Touch panel controller
Wires twisted
Shorted at root
Remarks
LONWORKS ®
compatible cable
System controller
En-12
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