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Unit has a four-level capacity control system, energy regulation: [100, 75, 50, 25 (or startup), 0%] can be adjusted automatically according to the load change unit stops and open, effectively save energy. At run time, microcomputer control system based on cooling load changes to change the unit of energy output. Microcomputer monitoring measurement of difference between real load and user settings, quickly sent the energy needed to drive spool valve to control instructions. When working on multiple machines at the same time, the unit for optimal cooling capacity output, minimum power consumption optimization work that not only reflect excellent performance when you load, part load efficiency is better