Specifications

49
(2) The transmitting specification for “A” control
1Wiring regulations
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.
2Transmitting specification
OCT04B-2.qxp 05.11.29 11:28 AM Page 49