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16
Communication and Power Lines
Communication cable
- Types : shielding wire
- Use wires of size : over 1.25 mm
- Maximum allowable temperature: 60 °C (140 °F)
- Maximum allowable line length: under 300 m (984.3 ft)
Remote control cable
- Types : 3-core cable
Simple central control cable
- Types : 4-core cable (Shielding wire)
- Use wires of size : over 0.75 mm
Separation of communication and power lines
- If communication and power lines are run alongside each other then
there is a strong likelihood of operational faults developing due to in-
terference in the signal wiring caused by electrostatic and electro-
magnetic coupling.
The tables below indicates our recommendation as to appropriate
spacing of communication and power lines where these are to be run
side by side
Current capacity of power cable
10 A
50 A
100 V or more
100 A
Exceed 100 A
NOTE
!
• The figures are based on assumed length of parallel cabling up
to 100 m (328.1 ft). For length in excess of 100 m (328.1 ft) the
figures will have to be recalculated in direct proportion to the ad-
ditional length of line involved.
• If the power supply waveform continues to exhibit some distor-
tion the recommended spacing in the table should be increased.
- If the lines are laid inside conduits then the following point
must also be taken into account when grouping various lines
together for introduction into the conduits
- Power lines(including power supply to air conditioner) and sig-
nal lines must not be laid inside the same
- In the same way, when grouping the lines power and signal
lines should not be bunched together.
CAUTION
!
If apparatus is not properly earthed then there is always a risk of
electric shocks, the earthing of the apparatus must be carried out by
a qualified person.
Wiring of Main Power Supply and Equipment Capacity
- Use a separate power supply for the Outdoor Unit and Indoor Unit.
- Bear in mind ambient conditions (ambient temperature,direct sun-
light, rain water,etc.) when proceeding with the wiring and connec-
tions.
- The wire size is the minimum value for metal conduit wiring. The
power cord size should be 1 rank thicker taking into account the line
voltage drops. Make sure the power-supply voltage does not drop
more than 10 %.
- Specific wiring requirements should adhere to the wiring regulations
of the region.
- Power supply cords of parts of appliances for outdoor use should not
be lighter than polychloroprene sheathed flexible cord.
- Don't install an individual switch or electrical outlet to disconnect
each of indoor unit separately from the power supply.
2
2
(0.002 in
)
2
2
(0.001 in
)
Spacing
300 mm (11-13/16 inch)
500 mm (19-11/16 inch)
1,000 mm (39-3/8 inch)
1,500 mm (59-1/16 inch)
WARNING
!
• Follow ordinance of your governmental organization for techni-
cal standard related to electrical equipment, wiring regulations
and guidance of each electric power company.
• Make sure to use specified wires for connections so that no ex-
ternal force is imparted to terminal connections. If connections
are not fixed firmly, it may cause heating or fire.
• Make sure to use the appropriate type of overcurrent protection
switch. Note that generated overcurrent may include some
amount of direct current.
CAUTION
!
• Some installation site may require attachment of an earth leakage
breaker. If no earth leakage breaker is installed, it may cause an
electric shock.
• Do not use anything other than breaker and fuse with correct ca-
pacity. Using fuse and wire or copper wire with too large capacity
may cause a malfunction of unit or fire.
• When the 400 volt power supply is applied to "N" phase by mistake,
replace inverter PCB and transformer in control box.
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
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.
Power wire(Ground wire)
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