Air electric heaters can be activated by interlock devices and remain shut off for extended periods. When installing temperature sensors in an air preheater, the "+" and "-" terminals should be connected to the corresponding "+" and "-" terminals of the control cabinet. Before using the heater, measure the cold-state insulation resistance between the power input terminals and the metal housing; the value should not be less than 2mΩ. The relative humidity of the working environment should not exceed 85%. The power cable entry and exit points should be firmly and reliably secured and not loose. Before use, check that the power cable and temperature sensor output connections are correct, and that the components and screws in the control cabinet are not loose or damaged. In case of any abnormalities, tighten or replace them promptly. After confirming that everything is in order, the heater can be powered on for trial operation. In recent years, China's economic development has been rapidly recognized worldwide, and whether China's economy can achieve stable and rapid development is closely linked to the development of various industries. Taking the development of the electric heater industry as an example, it has greatly promoted progress in all aspects of China's economy. In the electric heater industry, both electric heater products and components have achieved steady technological breakthroughs, developed more varieties, and met the needs of more people. Secondly, the intense market price competition in the electric heater industry has prompted people to continuously establish and improve industry management systems, enhance the services provided by the accounting industry, and establish an industry brand. This allows more high-quality and capable company employees to stand out in the fierce competition and become new industry flags. Only with the emergence of such corporate cultures can we better drive and activate the entire Chinese economic and financial market.