20
8.5.7 Requirements for power cord connection
Correct
Wrong
L1 L2 L3 N
L1
L2 L3
N
L1 L2 L3 N
L1
L2 L3
N
Fig. 8-11 Requirements for power cord connection
8.5.8 Function of terminals
As shown in the figure below, the unit 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 8.5.13
The wired controller
communication
Unit communication
XT2
Fig. 8-12 Wiring of unit communication and the wired controller
communication
When the water pump and auxiliary heater are added exter-
nally, 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 8.5.13.
The user can connect an ac light to monitor the state of com-
pressor.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.
220-240V~
50Hz
L1/L2/L3
N
Coil of
3 phase
AC contactor
HEAT1
PUMP
COM
N
XT1
Coil of
3 phase
AC contactor
Max voltage:240VAC
Max current:5A
COMP-STATE
Fig. 8-13 Wiring of water pump and pipeline auxiliary heater
and ac light of the state of compressor
8.5.9 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 S5-3 is cho-
sen 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: Shorting the terminal block XT2 at 15 and 24
inside the electric control box to enable the remote function of
“ON/OFF”.
NOTE
Please use the round-type terminal with correct
specifications to connect the power cord.
