Switch Box Layout - Indoor Unit EKHBRD ESIE09-0828 Refrigerant Circuit1. Switch Box Layout - Indoor Unit EKHBRDEKHBRD 011/014/016 AAV1Legend867 D C123BA91112104 5No. Name1 Main PCB (A1P)2 Control PCB (A3P)3 Inverter PCB (A4P)4 QA PCB (A5P)5 Filter PCB (A6P)6 Terminal block X1M: Main power supply7 Terminal block X2M: AC connections8 Terminal block X3M: DC connections9 DC connector X1Y10 Pump connector X2Y11 AC connector X3Y12 Interface relay K1AA DC field wiring entryB Compressor cable entryC Power wiring entryD AC field wiring entry