17
NOTE
Be sure to follow the limits below. If the transmission wiring is
beyond these limits, it may result in malfunction of transmission.
Maximum wiring length: 3280ft.
Total wiring length: 6560ft.
Max. branches No. of branches: 16
Max. number of outdoor units connectable: 10
Up to 16 branches are possible for transmission wiring. No branch-
ing is allowed after branching.
Never connect the power supply to transmission wiring terminal
block. Otherwise the entire system may break down.
(Refer to figure 16)
1.
Branch
2.
Subbranching
For low-noise operation, it is necessary to get the optional “Exter-
nal control adaptor for outdoor unit”.
For details, see the installation manual attached to the adaptor.
Picking power line and transmission line
•
Be sure to let the power line and the transmission line pass through
a conduit hole.
•
Pick the power line from the upper hole on the front position of the
main unit.
(Refer to figure 18)
1.
Electric wiring diagram
Printed on the back of the electric parts box lid.
2.
Knockout hole
3.
Power line
4.
Transmission line
Precautions when knocking out knockout holes
•
To punch a knockout hole, hit on it with a hammer.
•
Open an appropriate hole as needed.
•
After knocking out the holes, we recommend you paint the edges
and areas around the edges using the repair paint to prevent
rusting.
•
Power line: Open a knockout hole as shown at left and connect it
using a conduit.
•
Transmission line: Connect it using a conduit in the knockout hole
on the right.
CAUTION
•
Use a power wire pipe for the power wiring.
•
Outside the unit, make sure the low-voltage electric wiring
(i.e. for the remote control, between units, etc.) and the high-volt-
age electric wiring do not pass near each other, keeping them at
least 5in. apart. Proximity may cause electrical interference, mal-
functions, and breakage.
•
Be sure to connect the power wiring to the power wiring terminal
block and secure it as described in
7-4 Field line connection
.
•
Inter-unit wiring should be secured as described in
7-4 Field line
connection
.
•
Secure the wiring with the accessory clamps so that it does
not touch the piping.
•
Make sure the wiring and the electric parts box lid do not stick
up above the structure, and close the cover firmly.
Never connect 200 V to the terminal block of the interconnecting wiring.
Doing so will break the entire system.
•
The wiring from the indoor units must be connected to the F1/F2
(In-Out) terminals on the PC board in the outdoor unit.
For the above wiring, always use vinyl cords with AWG 18-16 sheath or
cables (2 core wires).
[In case of multiple outdoor units]
•
The interconnecting wiring between the outdoor units in the same
pipe line must be connected to the Q1/Q2 (Out Multi) terminals. Con-
necting the wires to the (Out-Out) terminals results in system mal-
function.
•
The wiring for the other lines must be connected to the F1/F2 (Out-
Out) terminals of the P-board in the outdoor unit to which the inter-
connecting wiring for the indoor units is connected.
•
The base unit is the outdoor unit to which the interconnecting wiring
for the indoor units is connected.
•
The interconnecting wiring between the outdoor units must be
100 ft. in length at maximum.
•
Over-tightening the terminal screws may break them and the circuit
board. See the following table for tightening torque.
NOTE
Be sure to keep the power line and transmission line apart from
each other.
Be careful about polarity of the transmission line.
Make sure that the transmission line is clamped as shown in the
figure in chapter “Field line connection”.
Check that wiring lines do not make contact with refrigerant piping.
Firmly close the lid and arrange the electric wires so as to prevent
the lid or other parts from coming loose.
8. BEFORE OPERATION
8-1 Checks after completion of work
WARNING
Make sure that the circuit breaker on the power supply panel of the
installation is switched off.
Attach the power wire securely.
After the installation, check the following before switching on the circuit
breaker:
1.
The position of the switches that requires an initial setting
Make sure that switches are set according to your application needs
before turning the power supply on.
2.
Power supply wiring and transmission wiring
Use a designated power supply and transmission wiring and make
sure that it has been carried out according to the instructions
described in this manual, the wiring diagrams and local and national
regulations.
3.
Pipe sizes and pipe insulation
Make sure that correct pipe sizes are installed and that the insulation
work is properly executed.
4.
Additional refrigerant charge
The amount of refrigerant to be added to the unit should be written
on the included “Additional Refrigerant” label, and attach it to the
rear side of the front cover.
5.
Measurement of insulation in main power circuit
Using a megatester for 500V, check that the insulation resistance of
2M
Ω
or more is attained by applying a voltage of 500V DC between
power terminals and earth. Never use the megatester for the trans-
mission wiring.
6.
Installation date
Be sure to keep record of the installation date on the “Additional
Refrigerant” label.
Burr
Knockout hole
Left side
Right side
Lock nut
Conduit
mounting
plate
Conduit
Electric parts box
(A1P)
Use the accessory clamps (1)
to retain them to the electric parts box.
Vinyl tube
(Accessory)
01_EN_3P114261-10Y.fm Page 17 Thursday, June 16, 2005 3:14 PM
