MATIC-PRO is an automatic expansion system whose main function is pressure maintenance along with increased volume and liquid compensation in heating and air conditioning systems. It is made up of a pump group (one or two high pressure centrifugal pumps) equipped with both soft start and stop, preventing extreme pressure variations. Included is a system of modulating valves and a non-pressurized tank. This system is regulated by a control panel with a micro-processor in a simple, rational and reliable manner. Furthermore, the de-gassing and automatic reintegration allow the system to always operate in conditions that permit efficiency and energy consumption optimization. The maximum working pressure is 10bar.