SYSVRF2 DUCT IM

11
7.3.1 Communication wiring between the indoor and outdoor units
7.4 Handling the Electrical Wiring Connection Points
2. For a unidirectional communication mode:
Use 1 wired controller to control 1 indoor unit (see Figure 7.9).
Figure 7.9
Figure 7.10
7.3.2 Communication wiring between the indoor unit and wired
controller
8.1 Capacity Settings
8. On-site Configuration
 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 communic
ation system and system control anomalies.

Use a three core shielded wire (greater than or equal to 0.75 mm
2
)
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.
(P Q E)
(P Q E)
Only the last indoor unit requires adding
the build-out resistor at P and Q.
(open)
Indoor and
outdoor units
Communication wire
Connecting the shielded
layer of the shielded wire
(Connect the shielded end of the shielded wire to the
electronic controller box sheet metal " " here)
Signalling line
between outdoor units
Outdoor
unit
P
Q
Figure 7.6
Build-out resistor
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);


X1 X2
X1 X2
Figure 7.7
Master wired controller Slave wired controller
P Q E X1 X2
Indoor unit 1
Wired controller 2
Wired controller 1
Figure 7.8
Master wired controller Slave wired controller
D1
D2
D1
D2
D1
D2
P Q E X1 X2
P Q E X1 X2
P Q E X1 X2
Wired controller 2
X2
X1 D2 D1
Wired controller 1
X2 X1 D2 D1
Indoor unit 1
Indoor unit 2
Indoor unit n(n<=16)
Indoor unit 1
Display board
A
B
C
D
A
B
C
D
Wired controller 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 7.10).
 Use the connecting wires (accessory 8) to connect the D1/D2 ports.
XP4 XS4
P Q E X1 X2
P Q E X1 X2
Yellow
Grey
White
Blue
Black
Display board
D2 D1
ENC1
SW1 SW7SW2SW3SW4SW5
SW6
ONON
POWER_S
CN17
CN9
CN15
ONONONONON
Main control panel
To outdoor/ indoor
units COMM. BUS
To wired
controller
COMM. BUS
To wired
controller
COMM. BUS
For the specific connection method, refer to the instructions in the
corresponding wired controller manual to carry out the wiring and
connections.
Caution
•
 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.
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
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.
ENC1
POWER_S

Wired
controller
A
B
C
D