The Constantia-D series air-cooled packaged chiller units, designed for small and medium series capacities, are equipped with tandem compressors anda operate on a dual-compressor-single-circuit system. This allows the device to start operating at half capacity in situations where the cooling demand is low, significantly reducing electricity consumption. Additionally, in the event of a compressor failure, the unit continues to operate at half capacity, preventing a complete process shutdown. Compared to completely independent units, they have lower initial investment costs. Furthermore, they have general features such as high temperature sensitivity, a colored touchscreen control panel (optional), and easy and fast installation thanks to the integrated hydraulic module. The Constantia-D series air-cooled packaged chiller units have a capacity range of 33.2-251 kW.