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6.2. Wiring method
6.2.1 Connection diagrams
The wiring example for outdoor units and indoor units is shown in the figure.
To other refrigerant
circuit outdoor unit
Power supply
Power supply
3N~ 400V 50Hz
3N~ 400V 50Hz
Breaker
Power supply
Power supply
Outdoor unit 1
Outdoor unit 2
(Primary)
(Subordinate 1)
Transmission
Transmission
Transmission
Indoor unit
Indoor unit
Power supply
Remote control
Power supply
*1
*1
*2
Breaker
Breaker
Remote
Power supply
Power supply
controller
(2-wire)
230V ~ 50Hz
230V ~ 50Hz
*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: Earth (Ground) the remote controller if it has an earth (ground) cable.
• 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.)
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.
Power supply
3N~ 400V 50Hz
Breaker
Breaker
Power supply
Outdoor unit 3
(Subordinate 2)
Transmission
Transmission
Transmission
Indoor unit
Remote control
Power supply
Remote control
*1
*2
*2
Breaker
Remote
Remote
Power supply
controller
controller
(2-wire)
(3-wire)
230V ~ 50Hz
CAUTION
< Left view >
Ø 50
Ø 34.5
Ø 43.7
Ø 22.2
(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*072LALDH
20
AJ*090LALDH
25
100 mA
AJ*108LALDH
25
0.1 sec or
less
AJ*126LALDH
40
AJ*144LALDH
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
3N~ 400V 50Hz
Breaker
Outdoor unit
Power supply 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
3N~ 400V
50Hz
Outdoor unit power supply cable
Main breaker: Main breaker ≥ Total Sub breaker
(Refer to the table in item (1) for the sub breaker
capacity)
< Front view >
Ø 50
Ø 34.5
Ø 22.2
Ø 43.7
(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
6
6
6
6
6
6
10
10
10
10
230V ~ 50Hz
Indoor unit
Power supply cable
Breaker
Remote controller cable
Example of prohibited breaker
wiring
Breaker:
Connecting multiple outdoor units
to one breaker is prohibited.
3N~ 400V
50Hz
Outdoor unit power supply cable:
Crossover wiring between outdoor
units is prohibited.
(m)
62
62
62
64
64
En-12
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