Single And Multi-Zone Outdoor Control Connections - Lennox MMA018SM4 Service Manual

17. Single and Multi-Zone Outdoor Control Connections

Figure 24. Typical Component Locations (MLB018S4M-1P, MPC024S4M-1P,
Inverter Outdoor PCB
24K Mono Main PCB
Port Descrip on Voltage
CN1 Power output for 4-way valve 230V/AC
Power output for compressor
CN6 230V/AC
heater
CN3 Port for L-in 230V/AC
CN9 Power output for chassis heater 230V/AC
CN4 Port for N-in
CN29 N-out for IPM board
CN37 L-out for IPM board 230V/AC
Port for communica on with
CN28
indoor unit
CN26 Port for test board
CN21 Communica on with IPM board 12V, 5V/DC
Power output for discharge (T5)
CN7
temperature sensor
CN18 Power output for EEV
MPC018S4M-2P, and MPC036S4M-1P
PCB Code: 17122300001076
CN7
CN26 6
CN28 8
Main Chip
EEPROM
CN37 7
5V/DC
CN29 9
5V/DC
12V/AC
71
CN21 CN18
Digital
Display
Check
Bu on
CN1
CN6
CN3
CN9
CN4