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< Left view >
Ø 50
Ø 34.5
Ø 43.7
Ø 22.2
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
accordance 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 capacity (A)
AJH072LNLAH
AJH090LNLAH
AJH126LNLAH
Outdoor unit power supply cable
MODEL
Power supply
cable (mm
AJH072LNLAH
4
AJH090LNLAH
4
AJH126LNLAH
10
1) These values are recommended data.
2) Specification: Use conformed cord with Type 60245 IEC66
3) 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.
Fig.
I n case of connected outdoor unit
Transmission cable
230 V 1ø 50 Hz
GOOD
400 V 3ø 50 Hz
Breaker
Outdoor unit
Power supply cable
(2) Selecting main breaker and main power supply cable when connecting multiple
outdoor units
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)
Leakage current
30
100mA
30
0.1sec or less
50
Critical wiring
2
Ground wire (mm
)
2
)
length (m)
4
30
4
30
6
42
Indoor unit
Power supply cable
Breaker
Remote controller cable
Fig.
I n case of connected 3 outdoor unit
GOOD
Sub
breaker
Main
breaker
400 V 3ø
50 Hz
Outdoor unit power supply cable
(3) Example of bad breaker wiring
PROHIBITED
400 V 3ø
50 Hz
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
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.
Wires twisted
2pcs at one side
PROHIBITED
PROHIBITED
Shorted at edge
Shorted at root
PROHIBITED
PROHIBITED
6. 5. 1.
Transmission wiring specifications
Follow the specifications below for the transmission cable.
Use
Size
22AWG LEVEL 4 (NEMA)
Transmission
2
0.33mm
non-polar 2core, twisted pair
cable
solid core diameter 0.65mm
6. 5. 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)
(3)Length of transmission cable between outdoor units in a refrigerant system
MN ≤ 18 m
NP ≤ 18 m
Outdoor unit
Power supply cable
PROHIBITED: crossover
power supply wiring prohibited
1 wire
GOOD
2 wires
GOOD
Wire type
Remarks
®
LONWORKS
com-
patible cable
En-12
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