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English
14
How to Insulation tube.
Use the insulation tube large to cover the power supply
•
wiring.
Use the insulation tube small to cover the transmission
wiring.
Joint the insulation tube with the tape and cut off the tube
•
sticking out of the outdoor unit.
tape
Insulation tube large-1
or
Insulation tube small-1
Insulation tube large-2
or
Insulation tube small-2
Cut off the sticking out
of the outdoor unit.
CAUTION
After fi nishing the electric wiring work, confi rm that all the
•
wirings are connected securely.
〈〈
Precautions when laying power wiring
〉〉
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 fi gure.
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.
Make sure to observe the following items. If they are not
observed, abnormal heat may be generated by slack in electric
wires, etc.
For wiring, use the designated power wire and connect
•
fi rmly, 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.
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
Transmission wiring connection procedure
7-4
If an excessive force is applied while connecting a cable
•
to the terminal block on the PC board, the PC board may
be damaged.
IN/D
OUT/D
F1 F2 F1 F2
L1
L2
F
1
IN/D
OUT/D
F
2
F
1
F
2
F1 F2
Use the conductor
of sheathed wire
(2 wire) (no polarity)
Indoor unit
CAUTION
For low-noise operation, it is necessary to install the optional
•
“External control adaptor for outdoor unit”.
For details, see the installation manual attached to the
adaptor.
Caution on the wiring length between units
Make sure to observe the restrictions below. If they are
not observed, transmission error may occur.
Maximum wiring length: 3280 ft.
Cautions on the wiring between units
Never connect 208-230V to the terminal block for the trans-
•
mission wiring.
Doing so will break the entire system.
The transmission wiring from the indoor unit must be con-
•
nected 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 wiring shown above.
∗
All cables used in the wiring between the units should
be procured on the site.
CHECKS AFTER COMPLETION OF
8.
WORK
After completing the work, make sure to confi rm the
following items:
Connection of drain piping and removal of transport fi ttings:
1.
Refer to “
5. CAUTIONS ON INSTALLATION
”.
Connection of power supply wiring and tightening of screws:
2.
Refer to “
7-3 Power supply wiring connection proce-
dure
”.
Connection of transmission wiring and tightening of screws:
3.
Refer to “
7-4 Transmission wiring connection proce-
dure
”.
Freezing connection of refrigerant piping
4.
Refer to “
6. REFRIGERANT PIPING WORK
”.
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2/24/2009 5:23:13 PM
2/24/2009 5:23:13 PM
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