Midea MCA3U-18HRFNX-QRD0W Service Manual page 63

No. Name
1 Power Supply
2 S
3 HEAT1
4 4-WAY
5 HEAT2
6 AC-FAN
7 TP T4 T3
8 TP T4 T3
9 PMV
10 DC-FAN
11 FAN_IPM
12 TESTPORT
13 EE_PORT
14 MCUPORT
W
15 V
U
16 COMP_IPM
17 CN9
18 CN32
Note: This section is for reference only. Please take practicality as standard.
CN#
CN3 Earth: connect to Ground
CN1 N_in: connect to N-line (208-230V AC input)
CN2 L_in: connect to L-line (208-230V AC input)
CN16 S: connect to indoor unit communication
CN17 connect to compressor heater, 208-230V AC when is ON
CN60 connect to 4 way valve, 208-230V AC when is ON.
CN15 connect to chassis heater, 208-230V AC when is ON
CN25 connect to AC fan
connect to pipe temp. sensor T3, ambient temp. sensor T4, exhaust
CN22
temp. sensor TP
connect to pipe temp. sensor T3, ambient temp. sensor T4, exhaust
CN21
temp. sensor TP
CN31 connect to Electric Expansion Valve
CN7 connect to DC fan
IPM 501 IPM for DC fan
CN6 used for testing
CN505 EEPROM programer port
CN507 connect to PC communication
CN28 connect to compressor
CN29 0V AC (standby)
CN30 10-200V AC (running)
IPM 301 IPM for compressor
CN9 connect to reactor
CN32 connect to reactor
Meaning