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M‐Thermal Split
Table 4‐2.2: MHA‐V4(6,8,10)W/D2N8 outdoor unit main PCB for refrigerant system
Label in Figure
4‐2.2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
34
Code
CN27
Output port N for invert module PCB
CN3
Output port N for hydro‐box control board
CN31
Port for ground wire
CN32
Port for IC programming
CN37
Port for ground wire
CN10
Input port for neutral wire
CN11
Input port for live wire
SW3
DIP switch
CN24
Input port for +12V/5V
CN13
Port for low pressure switch and high pressure switch
CN8
Port for Tp temp. sensor
CN9
Port for outdoor ambient temp. sensor and condenser temp. sensor
CN1
Port for Th temp. sensor
CN14
Port for TF temp. sensor
CN4
Port for pressure sensor
CN2
Reserved
CN29
Port for communication with hydro‐box control board
CN30
Reserved
CN17
Port for communication with invert module PCB
CN33
Port for electrical expansion value
DSP1
Digital display
CN6
Port for chassis electrical heating tape
CN5
Port for SV6 value
CN6
Port for 4‐way value
CN7
Port for compressor electric heating tape1
CN8
Port for compressor electric heating tape2
CN28
Output port L for invert module PCB
RL2
Output port L for hydro‐box control board
IC23
EEPROM
SW2
Check button
Midea CAC Confidential
Content
201909
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