SYSVRF2 WALL IM

7
FLA: Full Load Amps
Abbreviations:
MCA: Minimum Circuit Amps
kW: Rated motor output
Table 6.2 Indoor units electrical characteristics
MFA: Maximum Fuse Amps
IFM: Indoor Fan Motor
Capacity
IFM
Hz Volts
MCA
MFA kW FLA
2.2kW 50/60 220-240
15
50/60 220-240
15
3.6kW 50/60 220-240
15
4.5kW 50/60 220-240
15
5.6kW 50/60 220-240
15
7.1kW 50/60 220-240
15
50/60 220-240
15
9.0kW 50/60 220-240
15
Power supply
2.8kW
8.0kW
Warning
Refer to local laws and regulations when deciding on the
dimensions for the power cords and wiring. Get a professional to
select and install the wiring.
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.
 All shielded wiring in the network are interconnected, and will
eventually connect to earth at the same point “ ” .
 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 su
ch 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
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 6.6
Build-out resistor
X1 X2
Indoor unit 1
Wired controller 2
X1 X2
Wired controller 1
X1 X2
6.3.2 Communication wiring between the indoor unit and wired
controller
Figure 6.7
Master wired controller Slave 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);
X1 X2
(3.6~9.0kW )
(2.2/2.8kW )
Indoor unit 1
Wired controller 2
X2 X1 D2 D1
Wired controller 1
X2 X1 D2 D1
Indoor unit 2
X1 X2
D1 D2
Indoor unit n(n<=16)
D1
D2
D1
D2
Figure 6.8
rellortnoc deriw evalSrellortnoc deriw retsaM
X1 X2
X1 X2
E
(7.1~9.0kW )
(3.6~5.6kW )
(2.2/2.8kW )
For a unidirectional communication mode:
Use 1 wired controller to control 1 indoor unit (see Figure 6.9).
Indoor unit 1
Display board
A
B
C
D
Wired controller 1
Figure 6.9
0.45
0.58
1.1
0.32
0.47
0.90
0.90
0.32
0.02
0.02
0.058
0.058
0.058
0.06
0.06
0.06
0.25
0.25
0.36
0.37
0.46
0.72
0.72
0.88

