M thermal Split
36 202004
Midea M thermal Split
Table 4-2.1: HB-A60(100,160)/CGN8-B hydronic box main PCB
Label in Figure
4-2.1
Code Content
1 CN21 Port for power supply
2 S3 Rotary dip switch
3 DIS1 Digital display
4 CN5 Port for ground
5 CN28 Port for variable speed pump power input
6 CN25 Port for IC programming
7 S1,S2,S4 Dip switch
8 CN4 Port for USB programming
9 CN8 Port for Flow switch
10 CN6 Port for temp. sensors (T2,T2B,TW_out,TW_in, T1,)
11 CN24 Port for temp. sensor(Tbt1, The balanced water tank of up temp. sensor)
12 CN16 Port for temp. sensor(Tbt2, The balanced water tank of up temp. sensor)
13 CN13 Port for temp. sensor(T5, domestic hot water tank temp. sensor)
14 CN15 Port for temp. sensor(Tw2, The outlet water for zone 2 temp. sensor)
15 CN18 Port for temp. sensor(Tsolar, Solar panel temp. sensor)
16 CN17 Port for variable speed pump communication
17 CN31
Control port for room thermostat (heating mode)(HT)/Control port for room thermostat (cooling
mode)(CL)/Power port for room thermostat(COM)
18 CN35 Port for smart grid (grid signal, photovoltaic signal)
19 CN36 Port for remote switch, temperature board
20 CN19 Communicate port between indoor unit and outdoor unit
21 CN14 Port for communication with the wired controller
22 CN30
Communicate port between indoor unit and outdoor unit, port for communication with the wired
controller, internal machine parallel
23 CN7 Port for antifreeze E-heating tape(external), additional heat source, compressor run/defrost run
24 CN11
Control port for tank booster heater, internal backup heater 1, input port for solar energy, Port for room
thermostat, SV1(3-way valve), SV2(3-way valve), SV3(3-way valve), zone 2 pump, outside circulation
pump, solar energy pump, DHW pipe pump,
25 CN2 Feedback port for external temp. switch(shorted in default)
26 CN1 Feedback port for temperature switch(shorted in default)
27 CN22 Control port for backup heater1/booster heater/Reserved
28 CN41 Port for anti-freeze electric heating tape
29 CN42 Port for anti-freeze electric heating tape
30 CN29 Port for anti-freeze electric heating tape
31 IC39 EEPROM
Midea CAC
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