Power Cord Connection - EAS ELECTRIC CST4 Serie Manual De Instalación Y Manual De Usuario

6.1 Power Cord Connection

Use a dedicated power supply for the indoor unit that is different

from the power supply for the outdoor unit.
Use the same power supply, circuit breaker and leakage protective

device for the indoor units connected to the same outdoor unit.
Outdoor power
supply
RCCB
Grounding line
Grounding line
Indoor power
supply
RCCB
Communication wire between
indoor and outdoor units
Figure 6.2 shows the power supply terminal of the indoor unit.
When connecting to the power supply terminal, use the circular wiring
terminal with the insulation casing (see Figure 6.3).
Use power cord that conforms to the specifications and connect
the power cord firmly. To prevent the cord from being pulled out by
external force, make sure it is fixed securely.
If circular wiring terminal with the insulation casing cannot be used,
please make sure that:
• Do not connect two power cords with different diameters to the
same power supply terminal (may cause overheating of wires due
to loose wiring) (See Figure 6.4).
Circular wiring
terminal
+
Power cord
F g i u e r 6 3 .
6.2 Electrical Wiring Specifications
220-240V~50Hz
220-240V~50/60Hz
Power supply Indoor unit
L N
Breakers with
current leakage
All-pole disconnection
device with leakage
protector
Indoor unit
Figure 6.5
Wire slot
Indoor unit
Figure 6.1
N L
POWER IN
Figure 6.2
: Copper wire
Proper power wiring connections
Insulation tube
F g i u e r 6 4 .
Indoor unit
Pull box Pull box
Pull box Pull box
Indoor unit Indoor unit
Refer to Tables 6.1 and 6.2 for the specifications of the power cord
and communication wire. A wiring capacity that is too small will
cause the electrical wiring to become too hot, and lead to accidents
when the unit burns and becomes damaged.
Table 6.1
Model
Power Phase
supply
Volt and frequency
Communication wire between
indoor and outdoor units
Communication wire between
indoor unit and wired controller
Field fuses
* Please refer to the corresponding wired controller manual for the wired
controller wiring.
Table 6.2 Indoor units electrical characteristics
Power supply
Capacity
Hz Volts
2.8kW
3.6kW
4.5kW
5.6kW
50
7.1kW 220-240V
50/60
8.0kW
9.0kW
10.0kW
11.2kW
14.0kW
Abbreviations:
MCA: Minimum Circuit Amps
MFA: Maximum Fuse Amps
IFM: Indoor Fan Motor
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 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 )
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.
11
2.8-14.0 kW
1-phase
220-240V~50Hz
220-240V~50/60Hz
Shielded 3×AWG16-AWG18
Shielded AWG16-AWG20
*
15A
IFM
MCA MFA kW FLA
0.41 15 0.08 0.33
0.41
15 0.08 0.33
0.56
15 0.08 0.45
0.56 15 0.08 0.45
0.56 15 0.08 0.45
0.76
15 0.08 0.61
0.88
15 0.17 0.70
1.00 15 0.17 0.80
1.00 15 0.17 0.80
1.20
15 0.17 0.96
kW: Rated motor output
FLA: Full Load Amps
" "
.
V.1
2