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Table 7.2 Indoor units electrical characteristics
Power supply
Model name
Hz
Volts
7.1kW
8.0kW
9.0kW
11.2kW
5
220-240
14.0kW
50/60
16.0kW
20.0kW
25.0kW
28.0kW
40.0-50.0kW
56.0kW
Abbreviations:
MCA: Minimum Circuit Amps
MFA: Maximum Fuse Amps
IFM: Indoor Fan Motor
kW: Rated motor output
FLA: Full Load Amps
1. Select the wire diameters (minimum value) individually for each unit
based on the Table 7.3, where the rated current in Table 7.3 means MCA
in Table 7.2.
2. Maximum allowable voltage range variation between phases is 2%.
3. Select circuit breaker that having a contact separation in all poles not less
than 3 mm providing full disconnection where MFA is used to select the
current circuit breakers and residual current operation breakers:
Table 7.3
Nominal cross-sectional area (mm
Rated current
of appliance A
Flexible cords
≤3
0.5
≤6
>3
and
0.75
≤10
>6
and
1
≤16
>10
and
1.5
≤25
>16
and
2.5
≤32
>25
and
4
≤50
>32
and
6
≤63
>50
and
10
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.
7.3 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.
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.
All shielded wiring in the network are interconnected, and will eventually
connect to earth at the same point "
IFM
MCA
MFA
kW
2.1
15
0.15
2.1
15
0.15
2.2
15
0.18
2.9
15
0.31
0
4.5
15
0.34
4.7
15
0.56
6.7
15
0.8
6.7
15
0.92
6.7
15
0.92
12.5
30
1.84
15.4
1.84
30
2
)
Cable for fixed wiring
and
0.75
1
to
1
to
and
1
1
to
and
1.5
1.5
to
and
2.5
and
4
2.5
to
and
6
4
to
and
10
6
to
and
16
10
to
" .
Outdoor
unit
(P Q E)
FLA
1.7
(P Q E)
1.7
Indoor and
outdoor units
1.7
Communication
wire
2.3
P
3.6
Q
(open)
3.8
5.4
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,
5.4
depending on the forms of communication.
5.4
1) For a bidirectional communication mode:
Use 1 wired controller to control 1 indoor unit or 2 wired controllers
12.4
(one master and one slave controller) to control 1 indoor unit
12.4
(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
2.5
Master wired controller
2.5
2.5
4
Indoor unit 1
6
10
16
25
Wired Controller 1
Master wired controller
2) For a unidirectional communication mode:
Use 1 wired controller to control 1 indoor unit (see Figure 7.9).
Indoor unit 1
2
) for
15
(Connect the shielded end of the shielded
wire to the electronic controller box sheet
metal "
" here)
Signalling line
between outdoor
units
Connecting the shielded
layer of the shielded wire
Only the last indoor unit requires adding the
build-out resistor at P and Q.
Figure 7.6
X1 X2
Wired Controller 2
Slave wired controller
Indoor unit 2
Wired Controller 2
Slave wired controller
Display Board
Wired Controller 1
Figure 7.7
Indoor unit n(n<=16)
Figure 7.8
A
B
C
D
A
B
C
D
Figure 7.9
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