The PI-485 board, model PMNFP14A1, is the communication of the air conditioner with the LG central control system. Power supply: 1, AC 230 V 50/60 Hz, maximum number of connected indoor units: 16 (e.g. Multi systems). The board works with LG air conditioners, except for commercial power units 09k and 12k, air conditioner in Compact Inverter series and Prestige, Artcool, Standard Plus and Standard room units.