33
ENGLISH
CAUTION
!
When the 400 volt power supply is applied to “N” phase by mistake,
check damaged parts in control box and replace them.
Precautions when laying power and ground wiring
Use round pressure terminals for connections to the power terminal block.
When laying ground wiring, you must use round pressure terminals.
Round pressure terminal
Power wire
(Ground wire)
When none are available, follow the instructions below.
- Do not connect wiring of different thicknesses to the power terminal
block. (Slack in the power wiring may cause abnormal heat.)
- When connecting cable which is the same thickness, do as shown in
the figure below.
- For wiring, use the designated power cable and connect firmly, then
secure to prevent outside pressure being exerted on the terminal
block.
- Use an appropriate screwdriver for tightening the terinal screws. A
screwdriver with a small head will strip the head and make proper
tighterning impossible.
- Over-tightening the terminal screws may break them.
Control Box and Wiring Location
- Remove all of the screws at front panel and remove the panel by
pulling it forward.
- Connect communication cable between main and sub outdoor unit
through the terminal block.
- Connect communication cables between outdoor unit and indoor
units through the terminal block.
- When the central control system is connected to the outdoor unit, a
dedicated PCB must be connected between them.
- When connecting communication cable between outdoor unit and
indoor units with shielded cable, connect the shield ground to the
earth screw.
Front
Panel
Communication and Power Cables
Communication cable
- Types : shielded wires or unshielded wires
- Cross section : 1.0 ~ 1.5 mm
2
(1.55 × 10-3 ~ 2.32 × 10-3 in
2
)
- Insulation material : PVC
- Maximum allowable temperature: 60 °C (140 °F)
- Maximum allowable cable length: under 500 m (1 640 ft)
Remote control cable
- Types : 3-core cable
Central control cable
Separation of communication and power cables
- If communication and power cables are run alongside each other then
there is a strong likelihood of operational faults developing due to
interference in the signal wiring caused by electrostatic and
electromagnetic coupling.
The tables below indicates our recommendation as to appropriate
spacing of communication and power cables where these are to be
run side by side
Current capacity of power cable Spacing
100 V or more
10 A 300 mm (11-13/16 inch)
50 A 500 mm (19-11/16 inch)
100 A 1 000 mm (39-3/8 inch)
Exceed 100 A 1 500 mm (59-1/16 inch)
Main power line
Terminal block
(Take care of the phase
Sequence of 3-phases
3-wires power system)
Main Board
External Board
CAUTION
!
In case of using the shielded wires, it should be grounded.
Product type Cable type Diameter
ACP&AC Manager
2-core cable (Shielding cable)
1.0 ~ 1.5 mm
2
(1.55 × 10
-3
~
2.32 × 10
-3
in
2
)
AC Smart
2-core cable (Shielding cable)
1.0 ~ 1.5 mm
2
(1.55 × 10
-3
~
2.32 × 10
-3
in
2
)
Simple central controller
4-core cable (Shielding cable)
1.0 ~ 1.5 mm
2
(1.55 × 10
-3
~
2.32 × 10
-3
in
2
)
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