13
English
12.
When wiring, do not allow the ground wires to contact the
compressor lead wires. If the wires contact each other,
adverse effects may occur to other units.
13.
When connecting two wires to one terminal, ensure that the
crimp-style terminals face with each other back to back.
Moreover, make sure that the wire of the smaller gauge is
located above.
At the same time, retain the power wires to the plastic
bracket using the accessory clamps (1).
14.
Terminal block
15.
Crimp-style terminal
16.
Wire gauge: Small
17.
Wire gauge: Large
18.
Plastic bracket
(Refer to figure 24)
1.
Retain with accessory clamps (3).
2.
Electric wiring
3.
Wiring between units
4.
Retain to the electric box with the accessory clamps (1).
5.
When routing out the power/ground wires from the right side:
6.
When routing the remote control cord and inter-unit wiring,
secure clearance of 50 mm or more from the power wiring.
Ensure that the power wiring does not contact any heated
sections (
).
7.
Retain to the back of the column support with the accessory
clamps (2).
8.
When routing out the inter-unit wirings from the opening for
piping:
9.
When routing out the power/ground wires from the front:
10.
When routing out the ground wires from the left side:
11.
Grounging wire
12.
When wiring, exercise sufficient caution not to detach the
acoustic insulators from the compressor.
13.
Retain to the back of the column support with the accessory
clamps (2).
14.
Section A
15.
Section B
16.
Power supply
17.
Branch switch, overcurrent breaker
18.
Earth leakage breaker
19.
Ground wire
20.
Unit A
21.
Unit B
22.
Unit C
Caution
〈〈〈〈
Precautions when laying power wiring
〉〉〉〉
Use round pressure terminals for connections to the power termi-
nal block.
When none are available, follow the instructions below.
•
Do not connect wiring of different thicknesses to the power ter-
minal block. (Slack in the power wiring may cause abnormal
heat.)
•
When connecting wiring which is the same thickness, do as
shown in the figure below.
•
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.
〈〈〈〈
Precautions when connecting the ground
〉〉〉〉
When pulling the ground wire out, wire it so that it comes through
the cut out section of the cup washer. (An improper ground con-
nection may prevent a good ground from being achieved.)
Field line connection: transmission wiring and cool/heat selection
[In case of RX5-16 type]
(Refer to figure 16)
1.
Cool/heat selector
2.
Outdoor unit P.C. board (A1P)
3.
Take care of the polarity
4.
Use the conductor of sheathed wire (2 wire) (nopolarity)
5.
Terminal board (field supply)
6.
Indoor unit
[In case of RX18-48 type]
(Refer to figure 18)
1.
Unit A (Base unit)
2.
Unit B
3.
Unit C
4.
TO IN/D UNIT
5.
TO OUT/D UNIT
6.
TO MULTI UNIT
7.
To cooler/heater selector
8.
To indoor unit
9.
To other systems
(Refer to figure 15)
1.
Heating/cooling switching remote control cord (when a
heating/cooling switch remote comtrol (sold separately)
is connected)
2.
Secure to the lock plate using the included clamping
material.
3.
Wiring between the units (Outdoor - outdoor)
4.
Wiring between the units (Indoor - outdoor)
Caution
Be sure to follow the limits below. If the unit-to-unit cables are
beyond these limits, it may result in malfunction of transmission.
Maximum wiring length: 1000m
Total wiring length: 2000m
Max branches No. of branches: 16
Max. number of outdoor units connectable: 10 or less
Up to 16 branches are possible for unit-to unit cabling. No
branching is allowed after branching.
Max. number of outdoor units connectable: 10 or less
Never connect the power supply to unit-to-unit cabling terminal
block. Otherwise the entire system may break down.
(Refer to figure 17)
1.
Branch
2.
Subbranching
Sequential start
Make the outdoor unit cable connections shown below.
The outdoor unit PC board (A1P) is factory set at “Sequential start
available“.
Setting the cool/heat operation
(heat pump unit only)
1.
Performing cool/heat setting with the remote controller connected
to the indoor unit.
Keep the cool/heat selector switch (DS1) on the outdoor unit PC
board (A1P) at the factory setting position IN/D UNIT.
(Refer to figure 19)
1.
1 = Remote controller
2.
Performing cool/heat setting with the cool/heat selector.
Connect the cool/heat selector remote controller (optional) to the
A/B/C terminals and set the cool/heat selector switch (DS1) on
the outdoor unit PC board (A1P) to OUT/D UNIT.
(Refer to figure 20)
1.
1 = Cool/heat selector
Tightening torque (N · m)
M8 (Power terminal block)
5.5-7.3
M8 (Ground)
M3 (Inter-unit wiring terminal block)
0.8-0.97
Connect same-
thickness wiring
to both sides.
Power wire
Round pressure terminal
It is forbidden to
connect two to
one side.
It is forbidden to
connect wiring of
different thicknesses.
Round pressure terminal
Cup washer
Cut out section
01_3P114261-9L-EN.fm Page 13 Thursday, August 28, 2003 3:33 PM
