AK-PC 781 multifunctional pack controller is said to allow easy-to-set-up, energy-efficient capacity control of refrigeration compressors and condensers with modular hardware and flexible software that extends as system requirements grow or change. The controller constantly optimizes compressors and condensers and provides oil management, heat reclaim, and CO2 control by ensuring stable suction and condensing-pressure regulation. Modules snap on a common platform to accommodate digital and analog inputs for a wide range of devices. Capacity control is available for as many as eight compressors, with three unloaders for each compressor. The controller networks with other of the company’s Adap-Kool refrigeration-control systems.