Midea RSJ-420/SZN1-H - Page 32

MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual
32
Table 2-7.4: Main PCB descriptions of RSJ-800/SZN1-H
Label in
Figure 2-7.4
Code
Content
0
CN39
Communication port for other unit
1
CN40
Communication port for wired controller
2
CN15
High pressure switch connection
3
CN21
Low pressure switch connection
4
CN30
E-heater pipe Temp. sensor connection of refrigerant
5
CN35
Water tank Temp. sensor connection
6
CN34
Water outlet Temp. sensor connector
7
CN43
E-heater pipe Temp. sensor connection of refrigerant
8
CN29
Water inlet Temp. sensor connector
9
CN27
Discharge Temp. sensor connector
10
CN26
Suction sensor connector
11
CN37
Black: Evaporator Temp. sensor connector
White: Outdoor ambient Temp. sensor connector
12
CN44
Compressor current detection port
13
Dial switch
14
Address dial code
15
Check switch
16
Digital pipe
17
CN31
AC power input
18
CN42
Fan motor connection
19
CN32
Transformer input
20
CN13
Compressor connection
21
CN7
Refrigerant pipe E-heating connection
22
CN57
Electric ball valve on
23
CN56
Electric ball valve off
24
CN11
Compressor crank E-heating connection
25
CN17
Solenoid valve connection
26
CN16
4-way valve connection
27
CN41
Circuit water pump and E-heater control
28
CN24
Remote alarm connection
29
CN25
Electronic expansion valve connection
30
CN28
Water flow control valve connection
31
CN38
Transformer output
32
CN36
Wired controller power supply
33
CN2
Remote on/off switch connection
34
CN3
Water flow switch connection
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