40
Procedure
Remove the rear part of the user interface.
Connect the cable to the appropriate terminals as shown in the picture.
Reattach the rear part of the user interface.
As described above, during wiring, port A in the unit terminal XT6 corresponds to port A in the user interface. Port B corresponds
to port B. Port X corresponds to port X. Port Y corresponds to port Y, and port E corresponds to port E.
This equipment supports MODBUS RTU
communication protocol.
NOTE
Wire type
Wire section(mm
2
)
Maximum wire length(m)
5 wire shielded cable
0.75~1.25
50
The unit has smart grid function, there are two ports on PCB to connect SG signal and EVU signal as following:
1. when EVU signal closed, the unit operate as below:
DHW mode turn on, the setting temperature will be changed to 70
℃
automatically, and the TBH operate as below:T5<69. the TBH
is on, T5 ≥ 70, the TBH is off. The unit operate in cooling/heating mode as the normal logic.
2. When EVU signal is open, and SG signal is closed, the unit operate normally.
3. When EVU signal is open, SG signal is open, the DHW mode is off, and the TBH is invalid, dis-infect function is invalid. The max
running time for cooling/heating is "SG RUNNIN TIME", then unit will be off.
b. For smart grid:
a. For room thermostat (Low voltage): see 9.7.6 2) for room thermostat
30
29
32
25
26
27
28
31
7
12
11
10
9
18
8
7
5
23
22
24
1
2
13
3
4
6
20
14
15
17
19
16
21
6
8
9
10
5
4
3
2
1
CN4
CN22
CN5
S3
DIS1
CN24
CN1
CN2
CN6
CN8
CN13
CN15
CN16
CN18
CN28
S2
CN42
CN21
S1
S4
CN11
CN7
CN17
CN19
CN30
CN35
CN14
CN31
CN36
CN25
CN29
CN40
CN41
For room thermostat (Low voltage)
For smart grid
12) For other functional ports
