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NOTE
Please use the round-type terminal with correct specifications to
connect the power cord.
8.4.8 Function of terminals
As shown in the figure below, For For SCV-750EB and
SCV-1400EB,the uint communication signal wire and the wired
controller signal wire is connected to the terminal block CN22 at
XYE on main board inside the electric control box. For specific
wiring, see chapter 8.4.14
CN22(main board)
Uint communication
As shown in the figure below, For SCV-900EB and
SCV-1800EB: the uint communication signal wire is connected
to the terminal block XT2 at 5(X), 6(Y) and 7(E), and the wired
controller signal wire is connected at 8(X), 9(Y) and 10(E) inside
the electric control box. For specific wiring, see chapter 8.4.14
XT2
Uint communication
Fig. 8-18 Wiring of unit communication and
the wired controller communication
For SCV-1800EB, Model A is connected to Model B, Model B is
connected to Model A in the next uint. For specific connection, see
chapter 8.4.14.
When the water pump and auxiliary heater are added externally,
a 3-phase contactor must be used for control. The model of
contactor is subject to the power of water pump and heater
power. The contactor coil is controlled by the main control board.
See the figure below for coil wiring. For specific wiring, see
chapter 8.4.14 .
The user can connect an ac light to monitor the state of
compressor.When the compressor is operating,the light will be
powered on.
The wiring of water pump and pipeline auxiliary heater and ac light
of the state of compressor is as follows.
The wired controller
communication
The wired controller
communication
NOTE
CN119(Slave board)
CN121(Slave board)
HEAT2
HEAT1
Coil of
3 phase
AC contactor
L1/L2/L3
220-240V~
50Hz
N
Fig. 8-19 Wiring of water pump and pipeline auxiliary heater
and ac light of the state of compressor(only for
SCV-750EB and
SCV-1400EB )
CN26(Main board)
CN33(Main board)
HEAT1 HEAT2 COM
COMP-STATE
Coil of
3 phase
AC contactor
L1/L2/L3
220-240V~
50Hz
N
Fig. 8-20 Wiring of water pump and pipeline auxiliary heater
and ac light of the state of compressor(only for
SCV-900EB and SCV-1800EB
8.4.9 Wiring of "ON/OFF" weak electric port
The remote function of "ON/OFF" must be set by DIP switch .The
remote function of "ON/OFF" is effective when S1-1 or S5-3 is
chosen ON, at the same time, the wired controller is out of control.
Corresponding parallel connect the "ON/OFF" port of the main
unit's electric control box,then, connect the "ON/OFF" signal
(provide by user) to the "ON/OFF" port of main unit as follows.
The remote function of "ON/OFF" must be DIP switch set.
Wiring method:
For SCV-750EB and SCV-1400EB
terminal block CN137 at slave board inside the electric control box
to enable the remote function of "ON/OFF" .
For SCV-900EB and SCV-1800EB
terminal block XT2 at 15 and 24 inside the electric control box to
enable the remote function of "ON/OFF" .
0# electric
control box
"ON/OFF" port
Fig. 8-21-1 Wiring of "ON/OFF " weak electric port
24
CN123(Slave board)
COMP-STATE
PUMP
Coil of
3 phase
AC contactor
Max voltage:240VAC
Max current:5A
CN25(Main board)
PUMP
Coil of
3 phase
AC contactor
Max voltage:240VAC
Max current:5A
)
:Shorting the
: Shorting the
0# electric
control box
"ON/OFF" port
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