20
1
3
2
16
7
6
5
4
8
9
10
11
12
13
14
15
17
18
19
20
21
22
23
26
25
24
27
Coding
Assembly unit
Coding
Assembly unit
1
Compressor connection port U
6
Reserved(CN302)
2
Compressor connection port V
7
Port for communication with PCB B(CN32)
3
Compressor connection port W
8
Input port L for rectifier bridge(CN501)
4
Output port for +12V/5V(CN20)
9
Input port N for rectifier bridge(CN502)
5
Port for fan(CN19)
/
/
2) PCB B, Main control board
Coding
Assembly unit
Coding
Assembly unit
1
Output port N to PCB A(CN27)
15
Port for pressure sensor(CN4)
2
Reserved(CN3)
16
Reserved(CN2)
3
Port for ground wire(CN31)
17
Port for communication with hydro-box control board
(CN29)
4
Port for IC programming(CN32)
18
Reserved(CN30)
5
Port for ground wire(CN37)
19
Port for communication with PCB A(CN17)
6
Input port for neutral wire(CN10)
20
Port for electrical expansion value(CN33)
7
Input port for live wire(CN11)
21
Digital display(DSPI)
8
DIP switch(SW3)
22
Port for chassis electrical heating tape(CN16)(optional)
9
Input port for +12V/5V(CN24)
23
Port for SV6 value(CN5)
10
Port for low pressure switch and high
pressure switch(CN13)
24
Port for 4-way value(CN6)
11
Port for discharge temp.sensor(CN8)
25
Port for compressor eletric heating tape 1(CN7)
12
Port for outdoor ambient temp, sensor and
condenser temp.sensor(CN9)
26
Port for compressor eletric heating tape 2(CN8)
13
Port for sunction temp.sensor(CN1
)
27
Output port L to PCB A(CN28)
14
Port for TF temp.sensor(CN14)