13
CAUTION
• After finishing the electric wiring work, confirm that all the wirings are
connected securely.
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Precautions when laying power wiring
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• Two electric wires of different thickness cannot be connected to the
power terminal block.
(Slack in the electric wires may generate abnormal heat.)
• Use round pressure terminals with insulting sleeve for connection to
the power terminal block.
If such terminals are not available for unavoidable reasons, connect
an electric wire of the same thickness to each side as shown in the
figure.
• For wiring, use the designated power wire and connect firmly, then
secure to prevent outside pressure being exerted on the terminal
board.
• Use an appropriate screwdriver for tightening the terminal screws.
A screwdriver with a small head will strip the head and make proper
tightening impossible.
• Over-tightening the terminal screws may break them.
• See the table below for tightening torque for the terminal screws.
7-4 Transmission wiring connection procedure
•
If an excessive force is applied while connecting a cable to the
terminal block on the PC board, the PC board may be damaged.
CAUTION
• For low-noise operation, it is necessary to install the optional “Exter-
nal control adaptor for outdoor unit”.
For details, see the installation manual attached to the adaptor.
Make sure to observe the restrictions below. If they are not
observed, transmission error may occur.
Maximum wiring length:
3280 ft.
• Never connect 208-230V to the terminal block for the transmission
wiring.
Doing so will break the entire system.
• The transmission wiring from the indoor unit must be connected to
the F1/F2 (TO IN/D UNIT) terminals on the PC board in the outdoor
unit.
∗
Make sure to use sheathed two-core cables of AWG18-16 in the wir-
ing shown above.
∗
All cables used in the wiring between the units should be pro-
cured on the site.
Make sure to observe the following items. If they are not observed,
abnormal heat may be generated by slack in electric wires, etc.
Tightening torque (ft·lbf)
M5
(Power supply and ground terminal block) 1.76 ~ 2.15
M4
(Shielded ground)
0.87 ~ 1.06
M3.5
(Transmission wiring terminal block)
0.58 ~ 0.72
arrow view
Screw
Transmission wiring
between units
Cable clamp
(Copper foil is provided.)
Shield
Fix the shield area of the unit-
to-unit wiring to the copper foil
area of the clamp.
When using shield wire
Power wire
Round pressure terminal
Attach insulation sleeve
Connect same-
thickness wiring
to both sides.
It is forbidden to
connect two to
one side.
It is forbidden to
connect wiring of
different thicknesses.
Caution on the wiring length between units
Cautions on the wiring between units
A B C F
1
F
2
F
1
F
2
A
B
C F1
F1
F2
F2
F1 F2
C/H SELECTOR
TO IN/D UNIT TO OUT/D UNIT
A1P
Outdoor unit PC board (A1P)
Use the conductor
of sheathed wire
(2 wire) (no polarity)
Indoor unit
01_EN_3PN05597-5R.fm Page 13 Wednesday, September 14, 2005 8:35 PM