34
(2) The transmitting specification for “A” control
1
Wiring regulations
Cross section
of cable
Round
2.5
2.5
1.5
2.5
3
3
4
4
(50)
✽
1
(45)
✽
3
60
✽
4
Not
applicable
✽
2
Flat
Flat
Round
Wire size
(mm
2
)
Number
of wires
Clockwise : S1-S2-S3
Clockwise : S1-S2-S3-Open
Connect S1 and S3 to the opposite angle
Not applicable
(Because center wire has no cover finish)
From left to right : S1-Open-S2-S3
Polarity
L(m)
(3C Flat cable
✕
2)
S1
S2 S3
✽
1 : In case that cable with stripe of yellow and green is available.
✽
2 : In the flat cables are connected as this picture, they can be used up to 80m.
✽
3 : In case of regular polarity connection (S1-S2-S3), wire size is 1.5mm
2
.
✽
4 : In case of regular polarity connection (S1-S2-S3).
The cable shall not be lighter than design 245 IEC or 227 IEC.
The cable length may vary depending on the condition of installation, humidity or materials, etc.
Section
Communications from remote controllers
Communications between indoor and outdoor units
The maximum length of
total wiring
500m
80m (Including the wiring among indoor units
in addition to the wiring between indoor and
outdoor units)
The maximum numbers
for connection
One remote controller can connect and operate
up to 16 indoor units by grouping them.
❋
1
One group can connect up to two remote controllers.
❋
1 Remote controller considers multiplex units as
a single group.
One outdoor unit can connect up to three
indoor units.
The cables applicable
0.3mm
2
to 1.25mm
2
Use either flat-type cable (3 cores:
{
1.6mm or
more) or wires in the table below.
❋
2 The diameter of the cables depends on
each unit.
Others
The wirings as follows are not allowed:
• The wiring that the indoor units of the same
refrigerant system are connected through TB5.
• The wiring which directly connects the terminals
for remote controllers.
The core wire connected to terminal S2 shall be
placed at the center of flat-type cable.
Section
Communications from remote controllers
Communications between indoor and outdoor units
Transmitting speed
83.3 bit/sec. (1 bit = 12ms)
83.3 bit/sec. (1 bit = 12ms)
Normal transmission
The terminal for remote controller transmits sig-
nals every 7.5 seconds; the indoor unit whose
refrigerant address is “0” responds them.
Outdoor unit transmits signals every 3 seconds;
all the connected indoor units respond them.
Modulation
The waveform modulates at 50kHz.
There is no modulation.
Detection of abnormal
communication
When transmitting error is detected for three con-
secutive minutes.
When transmitting error is detected for three
consecutive minute.
2
Transmitting specification
For 220-240V 50Hz
OCT04A-2.qxp 04.9.29 9:15 AM Page 34
