Main Board; Indoor Unit - mundoclima MVD DC2 Manual De Instalación Y Usuario

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 connect 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
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.
(Connect the shielded end of the shielded
Outdoor
wire to the electronic controller box sheet
unit
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 the
P
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);
X1 X2

Indoor unit 1

Wired Controller 1
Master wired controller
WDC-120GWK (CL97810)
WDC-86E/KD (CL97811)
Indoor unit 1
Wired Controller 1
Master wired controller
WDC-120GWK (CL97810)
" here)
Connecting the shielded
layer of the shielded wire
Figure 7.6
Wired Controller 2
Slave wired controller
WDC-120GWK (CL97810)
WDC-86E/KD (CL97811)
Figure 7.7
Indoor unit 2
Indoor unit n(n<=16)
Wired Controller 2
Slave wired controller
WDC-120GWK (CL97810)
Figure 7.8
2) For a unidirectional communication mode:
Use 1 wired controller to control 1 indoor unit (see Figure 7.9).
2
) for
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 7.10).
Use the connecting wires (accessory 8) to connect the D1, D2 ports.
A
Wired KJR-29B1/BK-E (CL92869)
B
KJR-86C-E (CL92870)
controller
C
D
Display
comm. bus
XT2 P Q E X1 X2
To outdoor/indoor To wired
units comm. bus controller
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.
36
Display Board
Wired Controller 1
KJR-29B1/BK-E (CL92869)
KJR-86C-E (CL92870)
Figure 7.9
XS4 XP4
SW6 SW7
1
D1 D2

Main Board

To wired
controller
Figure 7.10
WDC-120GWK (CL97810)
WDC-86E/KD (CL97811)
A
B
C
D
A
B
C
D
SW5 SW4 SW3 SW2 SW1
ENC1