Original Hitachi Set Free VRF outdoor inverter drive PCB board suitable for Hitachi VRF outdoor units. PCB part numbers 10891440FC4, 200576A221, INVROM No. P-4656 and BWV06H7C05890B. This inverter module board controls compressor operation, inverter drive functions, protection circuits, and communication within the VRF outdoor system. Ideal for replacement, repair, and maintenance of Hitachi VRF air conditioning systems.