Constant frequency condensing unit is a key equipment including Evaporative Cooler widely used in central air conditioning systems, mainly for refrigeration or heating. The working principle of this type of unit is to absorb or release heat by changing the physical state of the working medium (such as changing from gas to liquid or from liquid to gas), in order to achieve the purpose of regulating indoor temperature. The main characteristic of fixed frequency condensing units is that their operating frequency is fixed and cannot be adjusted according to changes in load. This means that the operating speed of the unit is constant regardless of the size of the load. Although this design reduces the energy efficiency ratio of the equipment to a certain extent, it is still widely used in various scale air conditioning systems due to its advantages such as simple structure, good stability, and easy maintenance.