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7.3.1 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 7.6).
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 "
(Connect the shielded end of the shielded wire to
the electronic controller box sheet metal "
Outdoor
unit
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)
7.3.2 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 7.7);
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 7.8);
Indoor unit 1
Wired controller 1
Master wired controller
Indoor unit 1
P Q E
X1 X2
Wired controller 1
Master wired controller
" .
" here)
Connecting the shielded
layer of the shielded wire
Figure 7.6
Wired controller 2
Slave wired controller
Figure 7.7
Indoor unit 2
Indoor unit n(n<=16)
P Q E
P Q E
X1 X2
Wired controller 2
Slave wired controller
Figure 7.8
2. For a unidirectional communication mode:
Use 1 wired controller to control 1 indoor unit (see Figure 7.9).
Indoor unit 1
2
)
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 7.10).
Use the connecting wires (accessory 8) to connect the D1/D2 ports.
To wired
To outdoor/ indoor
controller
units COMM. BUS
COMM. BUS
P Q E X1 X2
P Q E
X1 X2
Caution
•
For the specific connection method, refer to the instructions in the
corresponding wired controller manual to carry out the wiring and
connections.
7.4 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.
8. On-site Configuration
8.1 Capacity Settings
Set up the PCB board DIP switch on the indoor electric control box to
cater to different uses. Once the settings are done, make sure you
X1 X2
cut off the main power switch again, and then switch the power on. If
the power is not cut off and switched on again, the settings will not be
executed.
11
Display board
Wired controller 1
Figure 7.9
A
To wired
B
controller
C
COMM. BUS
D
D2
D1
Wired
controller
XP4 XS4
Display board
Main control panel
POWER_S
ON
ON
ON
ON
ON
ON
ON
ENC1
SW6
SW5
SW4
SW3
SW2
SW1 SW7
Figure 7.10
POWER_S
ENC1
A
B
C
D
A
B
C
D
V.2
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