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M‐Thermal Split
32
201909
Midea M‐Thermal Split Ser
vice Manual
Table 4‐2.1: MHA‐V4(6, 8,10)W/D2N8 hydronic box main PCB
Label in Figure
4‐2.1
Code
Content
1
CN5
Input port for solar energy
2
CN26
Port for IC programming
3
CN4
Output port for transformer
4
CN36
Power supply port for user interface
5
CN12
Port for remote switch
6
CN8
Port for flow switch
7
CN31
Control port for room thermostat(low voltage)
8
CN35
Port for smart grid
9
CN14
Communicate port between indoor PCB and user interface
10
CN19
Communicate port between outdoor unit and indoor unit
11
CN6
Port for temperature sensors(Twout, Twin, T1, T2,T2B )
12
CN13
Port for temperature sensor(T5,Sanitary water temp.)
13
CN15
Port for temperature sensor(T1B, the final outlet temp.)
14
CN16
Port for temperature sensor(Ta, room temp.)
15
CN17
Port for internal pump
16
S1, S2
Dip switch
17
CN34
Output port for deforst
18
CN40
Port for anti‐freeze eletric heating tape (internal)
19
CN41
Port for anti‐freeze eletric heating tape (internal)
20
CN25
Output port for external heating source /operation output port
21
S3
Rotary dip switch
22
CN27
Port for anti‐freeze eletric heating tape(external) /port for solar energy pump/output port for remote
alarm
23
CN37
Port for external circulted pump/pipe pump/mix pump/2‐way valve
24
CN24
Port for SV1(3‐way valve) and SV3
25
CN28
Port for internal pump
26
CN20
Input port for transformer
27
CN1
Feedback port for temperature switch
28
CN21
Port for power supply
29
CN2
Feedback port for external temp. switch(shorted in default)
30
CN22
Control port for backup heater/booster heater
31
CN3
Control port for room thermostat(high voltage)
32
IC18
EEPROM
33
SW4
Check button
Midea CAC Confidential
Summary of Contents for SMK-60/CGN8
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