Selecting Power Supply Cable And Breaker; Transmission Line - Fujitsu Airstage AJYA72LALH Installation Manual

< 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, specifi cation 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 specifi cations 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)
AJ A72LALH 30
AJ A90LALH 30
AJ 108LALH 50
AJ 126LALH 50
AJ 144LALH 50
Outdoor unit power supply cable
MODEL
Power supply
2
cable (mm )
AJ A72LALH 4
AJ A90LALH 4
AJ 108LALH 10
AJ 126LALH 10
AJ 144LALH 10
1) These values are recommended data.
2) Specifi cation: 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. In 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
100mA
0.1sec or less
Critical wiring
2
Ground wire (mm )
length (m)
4 30
4 30
6 42
6 42
6 42
Indoor unit
Power supply cable
Breaker
Remote controller cable
Fig. In 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 specifi cations
Follow the specifi cations 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 Amplifi er is required.
When the total length of the transmission line exceeded 500 m.
AB + BC + BD > 500 m (Fig.1)
When the total number of units* is over 64.
Transmission line length between each unit* ≥
(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