11
（
P Q E
）
（
P Q E
）
Only the last indoor unit requires adding the build-out resistance 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
control box sheet metal " " here)
Signalling line between outdoor units
Outdoor unit
P
Q
Figure 6.6
Matching
resistances
Model
2.2-8.0kW
Power
supply
220-240V~50Hz
220-240V~50/60Hz
Communication wire between
Shielded
3×AWG16-AWG18
Shielded
AWG16-AWG20
Field fuses
15A
Phase
Volt and frequency
1-phase
Table 6.2 Indoor units electrical characteristics
Capacity
IFM
Hz
Volts
MCA
MFA
kW
FLA
2.8kW
2.2kW
50
50/60
220 - 240
15
0.3
0.3
0.3
0.3
0.4
0.4
0.4
15
4.5kW
15
5.6kW
15
7.1kW
15
8.0kW
15
15
Power supply
3.6kW
0.1
0.5
0.1
0.5
0.1
0.5
0.1
0.5
0.1
0.6
0.1
0.6
0.1
0.6
Power supply
Breakers with
current leakage
All-pole disconnection
device with leak
protector
L N
Indoor unit
Pull box
Indoor unit
Indoor unit
Indoor unit
Pull box
Pull box
220-240V~50/60Hz
220-240V~50Hz
6.3 Communication Wiring
：
Copper wire
Proper power wiring connections
Figure 6.3
Figure 6.4
+
Power cord
Insulation tube
Circular wiring
terminal
6.2 Electrical Wiring Specifications
indoor and outdoor units
Indoor unit
*
Please refer to the corresponding wired control manual for the corresponding
control wiring.
Nominal cross-sectional area (mm
2
)
>3
>6
>10
>16
>25
>32
>50
and
and
and
and
and
and
and
≤
3
≤
6
≤
10
≤
16
≤
25
≤
32
≤
50
≤
63
0.75
1
1.5
2.5
4
6
10
and
and
and
and
and
and
and
1
1.5
2.5
4
6
10
16
0.5 and 0.75
Flexible cords
4
10
to
1.5
4
to
1
2.5
to
1
2.5
to
1
2.5
to
2.5
6
to
6
16
to
10
25
to
3.
Choose a circuit
breaker whose contact separation
between
all
poles is, at least,
3
mm
to provide
full
disconnection.
MFA
is
used
to
select
current
circuit
breakers
and
residual
current
operated breakers:
Table 6.3
Rated appliance
current
（
A
）
Fixed wiring cable
Warning
Refer
to
local
laws
and
regulations
when
deciding
on
power
cord
and
wiring dimensions.
Get
a
professional
to
choose and
install the wiring.
Use
only
shielded
wires
for
the
communication
wiring.
Any
other
type
of
wires
may produce signal interferences that will cause the unit 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 at least
300
mm
or
more
in
order
to
prevent
signal source interferences.
Communication wiring must not form a close loop.
6.3.1
Communication
wiring
between
indoor
and
outdoor units
The indoor and outdoor units communicate through 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
last
indoor
unit,
the
shielded
layer
must
be
properly
grounded
and
a
build-out
resistance
must
be
added
to
the
last
indoor
unit
to
enhance
communication system stability. (see Figure 6.6).
Incorrect
wiring
such
as
a
star
connection
or
a
closed
ring
will
cause
communication system instability and control system anomalies.
Use
a
3-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 main outdoor unit.
All network
shielded
wiringare
interconnected
and
will
eventually be
connected to earth at the same point
" "
.
6.3.2
Communication
wiring
between
the
indoor
unit
and
the
wired control
The
wired
control
and
the
indoor
unit
can
be
connected
in
different
ways,
according to the different forms of communication.
1) For a bidirectional communication mode:
Use 1 wired control to control 1 indoor unit or 2 wired controls
(one primary and one secondary control) to control 1 indoor unit
(see Figure 6.7);
Use 1 wired control to control multiple indoor units or 2 wired controls
(one primary and one secondary control) to control multiple indoor units
(see Figure 6.8);
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 6.3.
2. The maximum allowed voltage range variation between
phases is 2%.
Figure 6.5
Refer
to
Table
6.1
for
power
cord
and
communication wire specifications.
A
wiring
capacity
that
is
too
low
will
cause
electrical
wiring
overheating
and eventually lead to accidents when the unit burns and becomes damaged.
Table 6.1
Communication
wire
between
indoor
unit
and
wired
control *
