The AK-PC 551 is a versatile pack controller designed for managing 1 or 2 suction groups of compressors and a common condenser. It supports a variety of compressor combinations, including variable speed, Digital scroll, and Stream 4 cylinder compressors. The controller offers numerous energy-saving functions and optimization features, making it highly adaptable to any pack application. It can be fully configured through an LCD display, which can be built-in or remotely connected. The compact size of 8 DIN modules ensures easy integration, and the controller can be connected to a MODBUS communication network. It is available with 24 Vac or 110-230 Vac power supply options.