ABB ACH580-04-820A-4 450 kW HVAC drive. ABB ACH580-04-820A-4 is an ACH580 HVAC drive rated 450 kW, 820 A, 380-480 V, frame R11. It is designed for air-handling units, chillers, cooling towers, pumps and ventilation fans, with ABB drive control and energy-efficient motor operation.