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6.3 Communication Wiring
Use only shielded wires for the communication wiring. Any other
type of wires may produce a signal interference that will cause the
units to malfunction.
Do not carry out electrical works like welding with the power on.
Do not bind the refrigerant piping, power cords and communication
wiring together. When the power cord and communication wiring
are parallel, the distance between the two lines must be 300 mm or
more in order to prevent signal source interference.
Communication wiring must not form a closed loop.
6.3.1 Communication wiring between the indoor and outdoor units
The indoor and outdoor units communicate via the RS485 serial port.
The communication wiring between the indoor and outdoor units should
be connected one unit after another in a daisy chain from the outdoor
unit to the final indoor unit.And the shielded layer must be properly
grounded, and a build-out resistor must be added to the last indoor unit
to enhance the stability of the communication system (see Figure 6.6).
Incorrect wiring such as a star connection or a closed ring will cause
instability of the communication system and system control anomalies.
Use a three core shielded wire (greater than or equal to 0.75 mm )
for the communication wiring between the indoor and outdoor units.
Make sure the wiring is connected correctly. The connecting lead for
this communication wire must come from the master outdoor unit.
All shielded wiring in the network are interconnected, and will
eventually connect to earth at the same point
Outdoor
(Connect the shielded end of the shielded wire to the
unit
electronic controller box sheet metal "
Signalling line
(P Q E)
between outdoor units
(P Q E)
Indoor and
outdoor units
Communication wire
Only the last indoor unit requires adding
P
the build-out resistor at P and Q.
Q
(open)
6.3.2 Communication wiring between the indoor unit and wired
controller
The wired controller and the indoor unit can be connected in different
manners, depending on the forms of communication.
1) For a bidirectional communication mode:
Use 1 wired controller to control 1 indoor unit or 2 wired controllers
(one master and one slave controller) to control 1 indoor unit
(see Figure 6.7);
Use 1 wired controller to control multiple indoor units or 2 wired
controllers (one master and one slave controller) to control
multiple indoor units (see Figure 6.8);
Indoor unit 1
Wired controller 1
Master wired controller
"
"
.
" here)
Connecting the shielded
layer of the shielded wire
Figure 6.6
Wired controller 2
Slave wired controller
Figure 6.7
Indoor unit 1
Wired controller 1
M
a
t s
r e
i w
e r
d
c
o
n
r t
l l o
r e
2) For a unidirectional communication mode:
2
Use 1 wired controller to control 1 indoor unit (see Figure 6.9).
Indoor unit 1
The X1/X2, D1/D2 ports on the sides of the main control board
and the unidirectional communication port (display board side) are
for different types of wired controllers (see Figure 6.10).
Use the connecting wires (accessory 15) to connect the D1/D2 ports.
CN18
X1
X2
To wired controller
Indoor Main Control Board
comm. bus
Caution
•
For the specific connection method, refer to the instructions in the
corresponding wired controller manual to carry out the wiring and
connections.
6.4 Handling the Electrical Wiring Connection Points
Once the wiring and connections are done, use tie straps to
secure the wiring properly so that the connection joint cannot be
pulled apart by external force. The connection wiring must be
straight out so that the cover of the electrical box is level and can
be closed tightly.
Use professional insulation and sealing materials to seal and
protect the perforated wires. Poor sealing may lead to
condensation, and entry of small animals and insects that may
cause short circuits in parts of the electrical system, causing the
system to fail.
12
Indoor unit 2
Indoor unit n (n<=16)
Wired controller 2
S
a l
v
e
i w
e r
d
c
o
Figure 6.8
A
B
C
D
Display board
A
B
C
D
Wired controller 1
Figure 6.9
X
S6
X
P6
WHITE )
CN15(
Display Board
SW1 SW2 SW3 SW4 SW5 SW6 SW7
POWER_S
CN9
ENC1
D1 D2
To wired
controller
comm.bus
Figure 6.10
n
r t
l l o
r e
Wired
controller
A
B
C
D
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